Axiom QC4.2 User manual

QC series
QC4.2 - QC4.4 - QC2.4
Digitally Controlled Class D Power Ampliers with SMPS & DSP
USER MANUAL

FCC COMPLIANCE NOTICE
This device complies with part 15 of the FCC rules. Operaon is subject to the following two condions:
(1) This device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operaon.
CAUTION: Changes or modicaons not expressly approved by the party responsible for compliance could void
the user’s authority to operate the equipment.
NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to
part 15 of the FCC Rules. These limits are designed to provide reasonable protecon against harmful interference in
a residenal installaon. This equipment generates, uses, and can radiate radio frequency energy and, if not installed
and used in accordance with the instrucon manual, may cause harmful interference to radio communicaons.
However, there is no guarantee that interference will not occur in a parcular installaon. If this equipment does
cause harmful interference to radio or television recepon, which can be determined by turning the equipment o
and on, the user is encouraged to try to correct the interference by one or more of the following measures:
• Reorient or relocate the receiving antenna.
• Increase the separaon between the equipment and receiver.
• Connect the equipment into an outlet on a circuit dierent from that to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
This marking shown on the product or its literature, indicates that it should not be disposed with other household wastes at the end of
its working life. To prevent possible harm to the environment or human health from uncontrolled waste disposal, please separate this
from other types of wastes and recycle it responsibly to promote the sustainable reuse of material resources. Household users should
contact either the retailer where they purchased this product, or their local government oce, for details of where and how they can
take this item for environmentally safe recycling. Business users should contact their supplier and check the terms and condions of the
purchase contract. This product should not be mixed with other commercial wastes for disposal.
The lightning ash with arrowhead symbol within an equilateral triangle is intended to alert the user to the presence of uninsulated
“dangerous voltage” within the product’s enclosure, that may be of sucient magnitude to constute a risk of electric shock to persons.
The exclamaon point within an equilateral triangle is intended to alert the user to the presence of important operang and maintenance
(servicing) instrucons in the literature accompanying the appliance.
The informaon contained in this publicaon has been carefully prepared and checked. However no responsibility will be taken for any errors. All
rights are reserved and this document cannot be copied, photocopied or reproduced in part or completely without wrien consent being obtained
in advance from PROEL. PROEL reserves the right to make any aesthec, funconal or design modicaon to any of its products without any prior
noce. PROEL assumes no responsibility for the use or applicaon of the products or circuits described herein.
Il marchio riportato sul prodoo o sulla documentazione indica che il prodoo non deve essere smalto con altri riu domesci al
termine del ciclo di vita. Per evitare eventuali danni all’ambiente si invita l’utente a separare questo prodoo da altri pi di riu e di
riciclarlo in maniera responsabile per favorire il riulizzo sostenibile delle risorse materiali. Gli uten domesci sono invita a contaare
il rivenditore presso il quale è stato acquistato il prodoo o l’ucio locale preposto per tue le informazioni relave alla raccolta
dierenziata e al riciclaggio per questo po di prodoo. Gli uten aziendali sono invita a contaare il proprio fornitore e vericare i
termini e le condizioni del contrao di acquisto. Questo prodoo non deve essere smalto unitamente ad altri riu commerciali.
Il simbolo del lampo con freccia in un triangolo equilatero intende avverre l'ulizzatore per la presenza di "tensioni pericolose" non isolate
all'interno dell'involucro del prodoo, che possono avere una intensità suciente a costuire rischio di scossa elerica alle persone.
Il punto esclamavo in un triangolo equilatero intende avverre l'ulizzatore per la presenza di importan istruzioni per l'ulizzo e la
manutenzione nella documentazione che accompagna il prodoo.
Le informazioni contenute in questo documento sono state aentamente redae e controllate. Tuavia non è assunta alcuna responsabilità per
eventuali inesaezze. Tu i diri sono riserva e questo documento non può essere copiato, fotocopiato, riprodoo per intero o in parte senza
previo consenso scrio della PROEL. PROEL si riserva il dirio di apportare senza preavviso cambiamen e modiche esteche, funzionali o di
design a ciascun proprio prodoo. PROEL non assume alcuna responsabilità sull’uso o sul l’applicazione dei prodo o dei circui qui descri.

3
INDEX
MODEL QC4.2 QC4.4 QC2.4
Channels 4 (single) or 2 (bridge) 2 (single) or 1 (bridge)
Power 8 ohm * 250 W 500 W 1000 W
Power 4 ohm * 500 W 1000 W 2000 W
Power BRIDGE 8 ohm * 1000 W 2000 W 4000 W
Frequency response 20 Hz - 20 kHz
Input Sensivity (adjiustable
by DSP)
+3 dBu +6 dBu +3 dBu
Gain (xed) 32 dB 32 dB 38 dB
Input Impedance 30 Kohm (bal) / 15 Kohm (unbal)
Input Connectors INPUT: COMBO (XLR-F/JACK)
LINK: XLR-M
Output Connectors NL4 Speakon
Controls Level, GND li, Terminate, ID.
LED Indicators Signal/Limit, Protecon, Bridge, Parallel, Com, Terminate, Power
Signal Processing CORE processing, 96kHz / 40bit oang point SHARC DSP,
24 bit AD/DA converters
Signal Latency 1.6 mS
Cooling Variable speed DC fans
Protecons Clip Limiter, Short circuit, DC voltage, Over heang
Damping Factor > 500 @ 8 ohm
Slew Rate 50 V/uS
S/N Rao > 105 dB (unweighted)
THD+N < 0.5 %
Power Supply 230 V~ or 120 V~ - 50/60 Hz
Max Consumpon 2900 W 5300 W 1800 W ***
Rated Consumpon** 800 W 1350 W 600 W ***
Weight 11 Kg (24.3 lb) 12 Kg (26.5 lb)
Dimensions (W x H x D) 483 x 89 x 383 mm
(19 x 3.5 x 16.2 inch)19 x 3.5 x 16.2 inch)
483 x 89 x 463 mm
(19 x 3.5 x 18.2 inch)
* Standard EIA 1KHz THD < 1%
** Rated consumpon is measured with pink noise with a crest factor of 12 dB, this can be considered a standard music program.
*** With PFC circuit.
TECHNICAL SPECIFICATIONS
FCC COMPLIANCE NOTICE . . . . . . . . . . . . . . . . . . . 2
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . 3
SETUP AND RACK MOUNTING (FIG. 1 / 2) . . . . . . . 4
LOUDSPEAKER CABLE .......................4
CONNECTIONS (FIG.3) . . . . . . . . . . . . . . . . . . . . . . 5
DIMENSIONS (FIG.4) ........................5
FRONT PANEL (FIG.5) .......................6
REAR PANEL (FIG.6) ........................7
EXAMPLE A ...............................8
EXAMPLE B ...............................8
EXAMPLE C ...............................9
EXAMPLE D ...............................9
SAFETY AND PRECAUTIONS . . . . . . . . . . . . . . . . . 10
IN CASE OF FAULT .........................10
TROUBLESHOOTING .......................10
CE CONFORMITY ..........................11
PACKAGING, SHIPPING AND COMPLAINT . . . . . . 11
WARRANTY AND PRODUCTS RETURN . . . . . . . . . 11
INSTALLATION AND DISCLAIMER . . . . . . . . . . . . . 11
POWER SUPPLY AND MAINTENANCE . . . . . . . . . 11
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . 12
CONTROLS AND CONNECTIONS . . . . . . . . . . . . . . 12
PRONET .................................14
QC SETUP INSTRUCTIONS . . . . . . . . . . . . . . . . . . 15
Roung Signals ..........................15
DSP Features in brief . . . . . . . . . . . . . . . . . . . . . 16
Speaker protecon seng . . . . . . . . . . . . . . . . . 16

4
SETUP AND RACK MOUNTING (FIG. 1 / 2)
COLD AIR
FRONT REAR
FRONT REAR (closed)
COLD AIR
HOT AIR
HOT AIR
15 cm
6 inch
RECOMMENDED INSTALLATION
ON 8U OPEN RACK
EVENTUAL INSTALLATION WITH CLOSED BACK
ON 10U closed RACK
FIG.1
FIG.2
LOUDSPEAKER CABLE
Loudspeaker Line Losses (maximum permissible line lengths for 0.5dB losses, voltage or spl)
4 ohm load 8 ohm load Wire secon data PROEL recommended cables
feet meter feet meter mm² AWG 2 wires 4 wires 2 wires Fire-resistant
125 40 250 80 6.0 10 HPC626 - -
75 25 150 50 4.0 12 HPC624 HPC644 HPC624FRS
50 17.5 100 35 2.0 14 HPC620 HPC640 HPC620FRS
30 10 60 20 1.5 16 HPC610 - HPC610FRS
this is a short extracon of the wide assortment of cables available from PROEL, please visit our website at www.proelgroup.com

5
CONNECTIONS (FIG.3)
sleeve - ground
INPUT
Jack (balanced)
p - hot
ring - cold
INPUT
Balanced male XLR
PROEL code - NL4FX
PROEL code - NL4FX
SPEAKER POWER OUTPUTS
Neutrik NL4 Speakon Cable Connector
ground
hot
cold
INPUT
Jack (unbalanced)
ground
p - hot
cold
*note: connect both cold and ground to make cable from balanced to unbalanced
2-
1+
2+
1-
20mm
0.8"
8mm
0.3"
RED
BLACK
posive / red / rosso
n.c. 1+
negave / black / nero
1-
n.c.
SPEAKER POWER OUTPUTS
Neutrik NL4 Speakon Cable Connector
2-
1+
2+
1-
channel 1 posive
1+
channel 1 negave
1-
OUTPUT 1
2-
1+
2+
1-
bridge posive
n.c. 1+
bridge negave
1-
n.c.
OUTPUT BRIDGE
2-
1+
2+
1-
20mm
0.8"
8mm
0.3"
RED
BLACK
channel 2 posive
n.c. 1+
channel 2 negave
1-
n.c.
OUTPUT 2
channel 2 negave
NOTE: channels 3 and 4 are equal to channel 1 and 2 respecvely.
2-
channel 2 posive
2+
LINK
Balanced female XLR
ground
hot
cold
sleeve - ground
INPUT
Jack (balanced)
p - hot
ring - cold
INPUT
Balanced male XLR
PROEL code - NL4FX
PROEL code - NL4FX
SPEAKER POWER OUTPUTS
Neutrik NL4 Speakon Cable Connector
ground
hot
cold
INPUT
Jack (unbalanced)
ground
p - hot
cold
*note: connect both cold and ground to make cable from balanced to unbalanced
2-
1+
2+
1-
20mm
0.8"
8mm
0.3"
RED
BLACK
posive / red / rosso
n.c. 1+
negave / black / nero
1-
n.c.
SPEAKER POWER OUTPUTS
Neutrik NL4 Speakon Cable Connector
2-
1+
2+
1-
channel 1 posive
1+
channel 1 negave
1-
OUTPUT 1
2-
1+
2+
1-
bridge posive
n.c. 1+
bridge negave
1-
n.c.
OUTPUT BRIDGE
2-
1+
2+
1-
20mm
0.8"
8mm
0.3"
RED
BLACK
channel 2 posive
n.c. 1+
channel 2 negave
1-
n.c.
OUTPUT 2
channel 2 negave
NOTE: channels 3 and 4 are equal to channel 1 and 2 respecvely.
2-
channel 2 posive
2+
LINK
Balanced female XLR
ground
hot
cold
DIMENSIONS (FIG.4)
48,3 cm
19.0 inch
43,4 cm
17,0 inch
36,8 cm
14.5 inch QC4.2-QC4.4
44,8 cm
17.6 inch QC2.4
8,9 cm
3.5 inch
4,2 cm
1.65 inch

6
FRONT PANEL (FIG.5)

7
REAR PANEL (FIG.6)
OUTPUTS
1
1 + = CH1 +
1 - = CH1 -
2 + = CH2 +
2 - = CH2 -
21 + = CH2 +
1 - = CH2 - B1 + = + 1 - = -
OUTPUTS
3
1 + = CH3 +
1 - = CH3 -
2 + = CH4 +
2 - = CH4 -
41 + = CH4 +
1 - = CH4 - B1 + = + 1 - = -
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE, NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
OUTPUTS
1
1 + = CH1 +
1 - = CH1 -
2 + = CH2 +
2 - = CH2 -
21 + = CH2 +
1 - = CH2 - B1 + = + 1 - = -
OUTPUTS
3
1 + = CH3 +
1 - = CH3 -
2 + = CH4 +
2 - = CH4 -
41 + = CH4 +
1 - = CH4 - B1 + = + 1 - = -
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE, NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
OUTPUTS
1
1 + = CH1 +
1 - = CH1 -
2 + = CH2 +
2 - = CH2 -
21 + = CH2 +
1 - = CH2 - B1 + = + 1 - = -
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE, NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
INPUT
DO NOT COVERNON OSTRUIRE
1
INPUT
1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
OUTPUTS
1
1 + = CH1 +
1 - = CH1 -
2 + = CH2 +
2 - = CH2 -
21 + = CH2 +
1 - = CH2 - B1 + = + 1 - = -
OUTPUTS
3
1 + = CH3 +
1 - = CH3 -
2 + = CH4 +
2 - = CH4 -
41 + = CH4 +
1 - = CH4 - B1 + = + 1 - = -
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE, NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
OUTPUTS
1
1 + = CH1 +
1 - = CH1 -
2 + = CH2 +
2 - = CH2 -
21 + = CH2 +
1 - = CH2 - B1 + = + 1 - = -
OUTPUTS
3
1 + = CH3 +
1 - = CH3 -
2 + = CH4 +
2 - = CH4 -
41 + = CH4 +
1 - = CH4 - B1 + = + 1 - = -
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE, NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
OUTPUTS
1
1 + = CH1 +
1 - = CH1 -
2 + = CH2 +
2 - = CH2 -
21 + = CH2 +
1 - = CH2 - B1 + = + 1 - = -
OUTPUTS
3
1 + = CH3 +
1 - = CH3 -
2 + = CH4 +
2 - = CH4 -
41 + = CH4 +
1 - = CH4 - B1 + = + 1 - = -
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
AVIS: RISQUE DE CHOC ELECTRIQUE, NE PAS OUVRIR
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK
DO NOT EXPOSE THIS PRODUCT TO RAIN OR MOISTURE
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
(QC2.4)
(QC4.2 and QC4.4)

8
EXAMPLE B
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
L
HF driver
4Ω minimum
LF woofer
4Ω minimum
BIAMP loudspeaker
signal from a mixer with LR output,
QC internal roung:
or
1+ 1-
2+ 2-
R
L
4Ω minimum 4Ω minimum
signal from a mixer with LR output,
QC internal roung:
1+ 1- 1+ 1-
R
1+ 1-
subwoofer
4Ω minimum
1+ 1-
subwoofer
4Ω minimum
double subwoofer
4Ω + 4Ω minimum
1+ 2+
1- 2-
woofer 1 woofer 2
4 wires speakon cable4 wires speakon cable
DSP CH1
DSP CH2
OUT1
(L sat)
OUT2
(R sat)
IN1
IN2
Gain Reduct. = 0
STEREO MODE
DSP CH3
DSP CH4
OUT1
(L sub)
OUT2
(R sub)
IN3
IN4
Gain Reduct. = 0
STEREO MODE
DSP CH1
DSP CH2
OUT1
(LF)
OUT2
(HF)
IN1
IN2
(nc)
Gain Reduct.
PARALLEL MODE
1
DSP CH3
DSP CH4
set as GANGED
set as GANGED
set as GANGED
OUT3
(WF1)
OUT4
(WF2)
IN3
IN4
(nc)
Gain Reduct.
PARALLEL MODE
3
EXAMPLE A
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
L
HF driver
4Ω minimum
LF woofer
4Ω minimum
BIAMP loudspeaker
signal from a mixer with LR output,
QC internal roung:
or
1+ 1-
2+ 2-
R
L
4Ω minimum 4Ω minimum
signal from a mixer with LR output,
QC internal roung:
1+ 1- 1+ 1-
R
1+ 1-
subwoofer
4Ω minimum
1+ 1-
subwoofer
4Ω minimum
double subwoofer
4Ω + 4Ω minimum
1+ 2+
1- 2-
woofer 1 woofer 2
4 wires speakon cable4 wires speakon cable
DSP CH1
DSP CH2
OUT1
(L sat)
OUT2
(R sat)
IN1
IN2
Gain Reduct. = 0
STEREO MODE
DSP CH3
DSP CH4
OUT1
(L sub)
OUT2
(R sub)
IN3
IN4
Gain Reduct. = 0
STEREO MODE
DSP CH1
DSP CH2
OUT1
(LF)
OUT2
(HF)
IN1
IN2
(nc)
Gain Reduct.
PARALLEL MODE
1
DSP CH3
DSP CH4
set as GANGED
set as GANGED
set as GANGED
OUT3
(WF1)
OUT4
(WF2)
IN3
IN4
(nc)
Gain Reduct.
PARALLEL MODE
3

9
EXAMPLE D
EXAMPLE C
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
L
4Ω minimum 4Ω minimum
signal from a mixer with LR output,
QC internal roung:
1+ 1- 1+ 1-
R
1+ 1-
subwoofer
8Ω minimum
L
4Ω minimum 4Ω minimum
signal from a mixer with LCR output,
QC internal roung:
1+ 1- 1+ 1-
R
1+ 1-
subwoofer
8Ω minimum
C
DSP CH1
DSP CH2
OUT1 (L)
OUT2 (R)
DSP BRIDGE
OUT (L+R)
IN1
IN2
IN3
IN4
Gain Reduct. = 0
Gain Reduct. = -6
STEREO MODE
BRIDGE MODE
3+4
DSP CH1
DSP CH2
OUT1 (L)
OUT2 (R)
DSP BRIDGE
OUT (C)
IN1
IN2
IN3
IN4
(nc)
Gain Reduct. = 0
Gain Reduct. = 0
STEREO MODE
BRIDGE MODE
3
set as GANGED
set as GANGED
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
INPUT
DO NOT COVER NON OSTRUIRE
1
INPUT
3
4
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE 1
2
MIN. LOAD 4ΩMIN. LOAD 8ΩMIN. LOAD 4Ω
BRIDGE
INPUT IMPEDANCE
10K BALANCED
INPUT IMPEDANCE
10K BALANCED
INPUT 43INPUT
GND
LIFT
MAINS
DESIGNED & ENGINEERED BY PROEL
2
GND
LIFT
L
4Ω minimum 4Ω minimum
signal from a mixer with LR output,
QC internal roung:
1+ 1- 1+ 1-
R
1+ 1-
subwoofer
8Ω minimum
L
4Ω minimum 4Ω minimum
signal from a mixer with LCR output,
QC internal roung:
1+ 1- 1+ 1-
R
1+ 1-
subwoofer
8Ω minimum
C
DSP CH1
DSP CH2
OUT1 (L)
OUT2 (R)
DSP BRIDGE
OUT (L+R)
IN1
IN2
IN3
IN4
Gain Reduct. = 0
Gain Reduct. = -6
STEREO MODE
BRIDGE MODE
3+4
DSP CH1
DSP CH2
OUT1 (L)
OUT2 (R)
DSP BRIDGE
OUT (C)
IN1
IN2
IN3
IN4
(nc)
Gain Reduct. = 0
Gain Reduct. = 0
STEREO MODE
BRIDGE MODE
3
set as GANGED
set as GANGED

10
SAFETY AND PRECAUTIONS
• CAUTION: before using this product read carefully the following safety instrucons. Take a look of this manual enrely and preserve it for
future reference.
When using any electric product, basic precauons should always be taken, including the following:
– To reduce the risk, close supervision is necessary when the product is used near children.
– Protect the apparatus from atmospheric agents and keep it away from water, rain and high humidity places.
– This product should be site away from heat sources such as radiators, lamps and any other device that generate heat.
– This product should be located so that its locaon or posion does not interfere with its proper venlaon and heang dissipaon.
– Care should be taken so that objects and liquids do not go inside the product.
– The product should be connected to a power supply mains line only of the type described on the operang instrucons or as marked on the
product. Connect the apparatus to a power supply using only power cord included making always sure it is in good condions.
– WARNING: The mains plug is used as disconnect device, the disconnect device shall remain readily operable.
– Do not cancel the safety feature assured by means of a polarized line plug (one blade wider than the other) or with a earth connecon.
– Make sure that power supply mains line has a proper earth connecon.
– Power supply cord should be unplugged from the outlet during strong thunderstorm or when le unused for a long period of me.
– Do not place objects on the product’s power cord or place it in a posion where anyone could trip over, walk on or roll anything over it. Do not
allow the product to rest on or to be installed over power cords of any type. Improper installaons of this type create the possibility of re hazard
and/or personal injury.
– This product may be capable of producing sound levels that could cause
permanent hearing loss. Exposure to extremely high noise levels may cause
permanent hearing loss. Individuals vary considerably in suscepbility to noise-
induced hearing loss, but nearly everyone will lose some hearing if exposed
to sufficiently intense noise for a period of time. The U.S. Government’s
Occupational Safety and Health Administration (OSHA) has specified the
permissible noise level exposures shown in the following chart. According to
OSHA, any exposure in excess of these permissible limits could result in some
hearing loss. To ensure against potenally dangerous exposure to high sound
pressure levels, it is recommended that all persons exposed to equipment
capable of producing high sound pressure levels use hearing protectors while
the equipment is in operaon. Ear plugs or protectors in the ear canals or over
the ears must be worn when operang the equipment in order to prevent
permanent hearing loss if exposure is in excess of the limits set forth here. Keep
your's aenon that children and pets are more suscepble to excessive noise
levels.
IN CASE OF FAULT
• In case of fault or maintenance this product should be inspected only by qualied service personnel when:
– There is a aw either in the connecons or in the supplied connecng cables.
– Liquids have spilled inside the product.
– The product has fallen and been damaged.
– The product does not appear to operate normally or exhibits a marked change in performance.
– The product has been lost liquids or gases or the enclosure is damaged.
• Do not operate on the product, it has no user-serviceable parts inside, refer servicing to an authorized maintenance centre.
TROUBLESHOOTING
No Power • The amplier's "POWER" switch is o.
• Make sure the mains AC outlet is live (check with a tester or a lamp).
• Make sure the mains plug is securely plugged into mains AC outlet.
No Sound • Is the input LEVEL control for the channel turned up?
• Is the SIGNAL LED illuminated? If not check if your signal level is too low or check the signal cable, mixer and other
equipment seng and cabling.
• Are you sure your signal cables works properly? check it using a cable tester or replacing with a new one.
• Is the SPEAKON cable connector correctly inserted? turn it clockwise unl it clicks.
• Are you sure your power cable works properly? check it using a cable tester or replacing with a new one.
Distorted Sound • Input signal level is too high. Turn down your level controls.
NOTE: The loudspeakers should never be operated at a level which causes the amplier Clip LEDs to illuminate
constantly.
Dierent channel
level
• Check if are using a balanced cable for one channel and an unbalanced one for the other, as this would cause a
considerable dierence in channel levels.
• Be sure that your loudspeaker system is fully connected and both loudspeakers have the same impedance.
Noise / Hum • Enable GND LIFT buon on rear panel, if the problem persist press all GND LIFT buons for all system's ampliers.
• Whenever possible, preferably use only balanced cables. Unbalanced lines may also be used but may result in noise
over long cable runs.
• Somemes it helps to plug all audio equipment into the same AC circuit so they share a common ground.
Duraon Per Day
In Hours
Sound Level dBA
Slow Response
Typical
Example
890 Duo in small club
692
495 Subway Train
397
2100 Very loud classical music
1.5 102
1 105 Trac noise
0.5 110
0.25 or less 115 Loudest parts at a rock concert

11
No Sound and the
Amplier gets too hot
• The amplier temperature protecons trips, re-locate the amplier in a more venlated locaon.
No Sound and
Protecon trip
(LED PROTECT always
on)
• Could be a possible short circuit at the amplier loudspeakers outputs, the speaker’s inputs or in the cabling. Locate
and remove the short circuit.
• The impedance of the loudspeakers connected is too low. Use a speaker with a minimum impedance of 4Ω (8Ω in
the Bridge mode).
• If no load connected the protecon trips the same, a DC voltage has been detected in the amplier’s output circuit
and you have to contact you nearest service assistance center to repair the amplier.
CE CONFORMITY
• Proel products comply with direcve 2014/30/CE (EMC), as stated in EN 55103-1 and EN 55103-2 standards and with direcve 2014/35/CE
(LVD), as stated in EN 60065 standard.
• Under the EM disturbance, the rao of signal-noise will be changed above 10dB.
PACKAGING, SHIPPING AND COMPLAINT
• This unit package has been submied to ISTA 1A integrity tests. We suggest you control the unit condions immediately aer unpacking it.
• If any damage is found, immediately advise the dealer. Keep all unit packaging parts to allow inspecon.
• Proel is not responsible for any damage that occurs during shipment.
• Products are sold “delivered ex warehouse” and shipment is at charge and risk of the buyer.
• Possible damages to unit should be immediately noed to forwarder. Each complaint for package tampered with should be done within eight
days from product receipt.
WARRANTY AND PRODUCTS RETURN
• Proel products have operang warranty and comply their specicaons, as stated by manufacturer.
• Proel warrants all materials, workmanship and proper operaon of this product for a period of two years from the original date of purchase. If
any defects are found in the materials or workmanship or if the product fails to funcon properly during the applicable warranty period, the owner
should inform about these defects the dealer or the distributor, providing receipt or invoice of date of purchase and defect detailed descripon.
This warranty does not extend to damage resulng from improper installaon, misuse, neglect or abuse. Proel S.p.A. will verify damage on returned
units, and when the unit has been properly used and warranty is sll valid, then the unit will be replaced or repaired. Proel S.p.A. is not responsible
for any "direct damage" or "indirect damage" caused by product defecveness.
INSTALLATION AND DISCLAIMER
• Proel products have been expressly designed for audio applicaon, with signals in audio range (20Hz to 20kHz). Proel has no liability for damages
caused in case of lack of maintenance, modicaons, improper use or improper installaon non-applying safety instrucons.
• These ampliers are adapted in a properly venlated, standard professional 19" rack. These units feature venlaon holes on the front and
back panels. Absolutely do not obstruct the venlaon holes. Blocked venlaon can cause damages and re.
• Do not locate sensive high-gain equipment such as mixer, preampliers, recorders or AD/DA conversion units directly above or below these
ampliers. Because these ampliers have a high power density, it ha a strong magnec eld which can induce hum into unshielded devices that
are located nearby. If an equipment rack is used, we recommend locang the amplier in the boom of the rack and the mixer, preamplier or
other sensive equipment at the top.
• Proel S.p.A. reserves the right to change these specicaons at any me without noce.
• Proel S.p.A. declines any liability for damages to objects or persons caused by lacks of maintenance, improper use, installaon not performed
with safety precauons and at the state of the art.
POWER SUPPLY AND MAINTENANCE
• Clean only with dry cloth.
• Check periodically that the slots for its proper venlaon and heang dissipaon are not obstructed by dust, remove the dust using a dry brush
or a compressed air gun.
• The QC4.2, QC4.4 and QC2.4 ampliers of Proel have been designed with CLASS I construcon and must be connected always to a mains socket
outlet with a protecve earth connecon (the third grounding prong).
• Before connecng the product to the mains outlet make certain that the mains line voltage matches that shown on the rear of the product, a
tolerance of up to ±10% is acceptable.
• To disconnect these equipment from the AC Mains, disconnect the power supply cord plug from the AC mains outlet.
• THE REPLACEMENT OF FUSES INSIDE THE APPARATUS MUST BE MADE ONLY BY QUALIFIED PERSONNEL.
• CHECK THE CONDITION OF THE PROTECTION FUSE, ACCESSIBLE OUTWARD, ONLY WITH THE APPARATUS SWITCHED OFF AND DISCONNECTED
FROM THE MAINS LINE OUTLET.
• REPLACE THE PROTECTION FUSE ONLY WITH SAME TYPE AS SHOWN ON THE PRODUCT.
• IF AFTER THE SUBSTITUTION, THE FUSE INTERRUPTS AGAIN THE APPARATUS WORKING, DO NOT TRY AGAIN THEN CONTACT THE PROEL
SERVICE CENTRE.

12
GENERAL INFORMATION
Thank you for having chosen a PROEL product.
QC series is based on PROEL DA ampliers, a new generaon of digitally controlled Class D power modules with Switch
Mode Power Supply (SMPS) featuring an innovave technology. Unlike most of the competors in this range, which use
a xed switching frequency, the PWM (Pulse Width Modulaon) output stage of DA modules uses a variable switching
frequency according to the input signal level. This technology oers performances far above most of the products
currently available on the market: beer sound denion, high-delity reproducon of any frequency of the audio
range, higher dynamics at any signal level with low distoron even at very high powers. The superior sound quality can
be compared with top-of-the-range AB-class analog systems, while DA modules thanks to the use of SMPS and Class D
feature very compact size and light weight, eciency above 90% and negligible heat dissipaon.
The very high eciency levels result also in a signicant reducon in the energy waste associated with large installaons,
a noceable reducon in operang costs and a direct benet to the environment. Featuring high power levels in a
lightweight and compact chassis, the QC ampliers are much easier and more economical to transport than convenonal
models and this, in turn, makes them even more environmentally friendly.
In the top-of-the-range model, QC2.4, the use of PFC (Power Factor Correcon) technology used for the power supply
stage guarantees that the performance of the amplier is always stable, even when the voltage is not. Regardless of any
eventual uctuaons of the power supply, the QC2.4 will always be able to deliver the highest level of power.
QC ampliers feature an ergonomic and funconal design with removable dust lters, for an easy maintenance in all
condions of use and therefore extensive durability. The protecon system includes thermal protecon, short circuit
protecon, high frequency protecon and CLIP LIMITER circuit.
CONTROLS AND CONNECTIONS
1. Power switch and Power indicator
Amplier is "ON" when the switch is in the "I" posion. The Blue LED indicates amplier has been turned on.
2. RESET BUTTON
This buon can be used to reset the QC amplier’s DSP for service operaons. Use a paper clip rod to press and
hold this buon when powering the amplier ON: this will perform a reset of the CORE DSP and set it back to the
factory preset “1-D-Default” (all the stored presets are cancelled). This operaon can be useful in case you cannot
connect the QC amplier to a PC for checking and modifying the DSP parameters, but you need to use it anyway as a
standard amplier. Remind that QC ampliers have always a 1.6mS latency also if the internal CORE DSP is completely
at.
3. PRONET Network IN connector
This is a standard RJ45 CAT5 connector, used for transmission of remote control data over long distance or mulple unit
applicaons. See PRONET secon further on this manual.
4. PRONET Network OUT connector
This is a standard RJ45 CAT5 connector, used for transmission of remote control data over long distance or mulple unit
applicaons. See PRONET secon further on this manual.
5. TERMINATE switch
When connected to a PRONET network the last device must be terminated (with an inner load resistance) especially in
a long run cabling: press this switch if you want to terminate the unit. The yellow LED indicates the terminaon status:
ON when terminated, OFF when not terminated.
6. ID buon
This buon is used to assign an ID number to the amplier. If you press and hold this buon when powering the amplier
ON you’ll force the internal DSP to re-assign an ID to the unit for the PRONET remote control operaon. See PRONET
secon further in this manual
Note: for a correct operaon keep the ID buon pressed unl the internal relais connect the outputs or wait at least 10
seconds before releasing it.
7. COM indicator
The COM LED glows when the correct PRONET network communicaon is acve.
8. PARALLEL mode indicator
This yellow LED glows when the channel pair 1-2 or 3-4 is in parallel mode.
9. BRIDGE mode indicator
This yellow LED glows when the channel pair 1-2 or 3-4 is in bridge mode.

13
10. Channel SIGNAL/LIMIT Indicator
This LED glows in GREEN color to show the presence of the signal at the correspondent amplier channel.
This LED glows in RED color when the DSP is liming the channel’s output or when the channel input is clipping.
NOTE: in case of input clipping you have to reduce the input signal in the signal chain before the amplier input.
11. Channel PROTECT Indicator
RED LED glows when the correspondent channel is in protect mode for one of the following reasons:
• The heatsink reaches a temperature above the normal working limit.
• There is a short circuit at the amplier output wires.
• The amplier output stages are faulty.
Consequently the channel is muted unl the reason of fault is removed.
NOTE: When the channel pair operates in PARALLEL and BRIDGE mode SIGNAL, LIMIT and PROTECT LED indicators of
the channel pairs 1-2 or 3-4 illuminate simultaneously.
12. Input Channel LEVEL Control
This control reduces the level of the signal sent to the correspondent channel aer the A/D conversion and before any
channel sum (PARALLEL or BRIDGE modes) and any DSP processing.
The reducon ranges from “∞” fully closed (the signal is completely aenuated) to “0” fully open, nominal level.
13. INPUT
This is a female combo connector, which accepts a XLR or a JACK plug from almost any type of equipment with a
balanced or unbalanced outputs. The XLR input is wired as follows:
Pin 1 = shield or ground
Pin 2 = + posive or "hot"
Pin 3 = - negave or "cold"
The JACK input is wired as follows:
Tip = + posive or "hot"
Ring = - negave or "cold"
Sleeve = shield or ground
When connecng an unbalanced signal, wire them as follows:
Pin2 / Tip = + posive or "hot"
Pin 1-3 / Sleeve = shield or ground
NOTE: whenever possible, use always balanced cables. Unbalanced lines may also be used but may result in noise over
long cable runs. In any case, avoid using a balanced cable for one channel and an unbalanced one for the other.
14. LINK
This is a male XLR connector is connected in parallel with the respecve INPUT (LINK is wired in the same way).
15. GND LIFT
This switch li the ground of the balanced audio inputs from the earth-ground of the amplier. If you have HUM noise
problems on one or more loudspeakers try to change the posion of these switches.
16. Channel 1 or 3 SPEAKON output
Accepts a male Neutrik Speakon NL4FX connector wired in this way:
• PIN 1+ connected to POSITIVE output of Channel 1/3;
• PIN 1- connected to NEGATIVE output of Channel 1/3;
• PIN 2+ connected to POSITIVE output of Channel 2/4,
• PIN 2- connected to NEGATIVE output of Channel 2/4,
If you use a 2 wire cable (1+/1-), you run to the speaker the amplied output of the signals coming from inputs 1 or 3.
If you use a 4 wire cable (1+/1-/2+/2-), you run to the speaker:
• STEREO mode: the amplied outputs of the signal coming from 1/3 input (1+/1-) and from 2/4 input (2+/2-),
• PARALLEL mode: the amplied outputs of the signals coming from 1+2 or 3+4 inputs (1+/1- and 2+/2- carry the same
signal),
In both modes using a single cable you can connect a BI-AMP loudspeaker or a SUB-SAT speaker system.
Always connect a loudspeaker with a minimum impedance of 4 ohm or more.
NOTE: Use only loudspeaker enclosure cables, never signal cables, i.e. those normally used for microphones, instruments
and audio equipment in general.

14
17. Channel 2 or 4 SPEAKON output
Accepts a male Neutrik Speakon NL4FX connector wired in this way:
• PIN 1+ connected to POSITIVE output of Channel 2/4;
• PIN 1- connected to NEGATIVE output of Channel 2/4;
• PIN 2+ and 2- NOT connected.
This is the amplied output of the signal coming from 2/4 input if the amplier is set in STEREO mode or the signal
coming from 1+2 or 3+4 inputs if the amplier is set in PARALLEL mode.
Always connect a loudspeaker with a minimum impedance of 4 ohm or more.
18. BRIDGE SPEAKON output
Accepts a male Neutrik NL4FX connector wired in this way:
• PIN 1+ connected to "in phase" (Channel 1/3);
• PIN 1- connected to "out phase" (Channel 2/4);
• PIN 2+ and 2- NOT connected.
This is the amplied output of the signal coming from 1 (+2) / 3 (+4) input if the amplier is set in BRIDGE mode.
Always connect a loudspeaker with a minimum impedance of 8 ohm or more.
NOTE: Use this output alone and only with BRIDGE mode seng.
19. MAINS ~ socket (QC2.4)
This is the amplier mains socket NEUTRIK type NAC3MPX. One NAC3FX-W plug is supplied in the package: the customer
has to assemble the mains cable with a proper mains plug according to the country standards. The mains cable must be
connected only to an electrical outlet complying with the amplier’s power supply specicaons.
See assembly instrucon downloadable from NEUTRIK WEB site at: hp://www.neutrik.com/.
20. MAINS ~ cord (QC4.2 and QC4.4)
This is the amplier mains supply cord. Connect the power cord to an electrical outlet complying with the amplier’s
power supply specicaons. Be sure that your amplier is o before plugging the mains cord into an electrical outlet.
PRONET
PRONET soware has been developed in collaboraon with sound engineers and sound designers, in order to oer an
“easy-to-use” tool to setup and manage your audio system. With PRONET you can visualize signal levels, monitor internal
status and edit all the parameters of each connected device.
Download the PRONET app from the AXIOM website at hp://www.axiomproaudio.com/ clicking on downloads
secon of the product.
To connect QC ampliers to a PC running PRONET control soware the network connectors on the front panel and PROEL
USB2CAN or USB2CAND converters (oponal) must be used. The rst me you connect a device with the USB2CAN
converter, Windows O.S. will ask you to install the driver les, which you can nd in the Driver folder within the Pronet
applicaon folder (by default is C:\Program Files\Proel\Pronet\Driver, or if you changed it <your path>\Driver). Please
refer also to “Installaon” and “Drivers” paragraphs in the Pronet documentaon.
The PRONET NETWORK is based on a robust, reliable and fast communicaon protocol called CANBUS. The devices in
a PRONET NETWORK are connected together with a “linear bus topology”. The USB2CAN converter must be connected
to the network input of the rst device, the network output of the rst device is connected to the input of the second
and so on. For the network connecons simple RJ45 cat.5 or cat.6 ethernet cables can be used (please don’t confuse
a ethernet network with a PRONET network these are completely dierent and must be fully separated also both use
the same kind of cable).
The beginning and the end of a PRONET NETWORK must be terminated. Each side must be terminated pressing the
TERMINATE switch on the last device. All devices between these two points must have the TERMINATE switch lied. One
side can be terminated using the USB2CAN converter or using the USB2CAND with the TERMINATE switched on.
See also PRONET EXAMPLE FIG.6 at page 6.
Assign the ID number
To work properly in a PRONET network each connected device must have a unique idener number, called ID. By
default the USB2CAN converter connected to the PC controller has ID=0 and there can be only one PC controller. Every
other device connected must have its own unique ID equal or greater than 1: in the network cannot exist two devices
with the same ID.
An ID number is assigned automacally to each devices when they are turned on for the rst me connected to a
network.
In order to correctly assign a new available ID to each device for working properly in a Pronet network, follow these
instrucons:

15
1. Switch o all the devices.
2. Connect them correctly with the network cables.
3. “TERMINATE” the last device in the network connecon.
4. Switch on the rst device keeping pressed at least for 5 seconds the “ID” or “PRESET” buon on the control
panel.
5. Leaving the previous device switched on, repeat the previous operaon on the next device, unl the latest device
is turned on.
The “Assign ID” procedure for a device makes the internal network controller to perform two operaons: reset the
current ID; search the rst free ID in the network, starng from ID=1. If no other devices are connected (and powered
on), the controller assume ID=1, that is the rst free ID, otherwise it searches the next one le free.
These operaons ensure that every device has it’s own unique ID, if you need to add a new device to the network you
simply repeat the operaon of step 4. Every device maintains its ID also when it is turned-o, because the idener is
stored in the internal memory and it is cleared only by another “Assign ID” step, as explained above. This means that if
your network is made always of the same devices the assigning ID procedure must be executed only the rst me the
system is turned on.
For more detailed instrucon about PRONET see the PRONET USER’S MANUAL included with the soware.
QC SETUP INSTRUCTIONS
To control the DSP features of QC ampliers the PRONET soware must be used, at least the rst me you setup the
whole audio system. Once the audio system is properly set, the QC ampliers can operate alone without the PC control
soware. All the features of the built-in CORE DSP are described in the PRONET user’s manual included with the soware
(see HELP menu), so in this manual only a few peculiarity of the QC ampliers architecture are explained.
Roung Signals
To start it’s important to understand QC signal roung. Each QC amplier has 2 or 4 physical inputs, each of them
supplied with a link connector. The link connectors are typically used to route physically the signal (using cables) to
another amplier, but they can be used also to route the signal to other channels of the same amplier (as shown
in some examples). Each analog input goes directly to the AD converter and, aer the conversion, the signal can be
aenuated digitally by the input channel level control (12) on the front panel. Depending on the selected operaon
mode, the input signals feed the amplier inputs individually or in pairs (1-2 and 3-4). The following gures shows each
operang mode:
NOTE: channels 3 & 4 are present only in 4-channel models.
The operang mode can be selected from the device panel (SETUP/CONFIGURATION opon) on the PRONET soware.
The examples at the beginning of the manual show some of the many conguraons that can be used.
DSP CH1
DSP CH2
DSP CH1
DSP CH2
OUT1
OUT2
OUT1
OUT2
DSP BRIDGE
OUT
IN1
IN2
IN1
IN2
IN1
IN2
Gain Reduct.
Gain Reduct.
Gain Reduct.
STEREO MODE channel pair 1-2
PARALLEL MODE channel pair 1-2
BRIDGE MODE channel pair 1-2
1+2
1+2
DSP CH3
DSP CH4
DSP CH3
DSP CH4
OUT3
OUT4
OUT3
OUT4
DSP BRIDGE
OUT
IN3
IN4
IN3
IN4
IN3
IN3
Gain Reduct.
Gain Reduct.
Gain Reduct.
STEREO MODE channel pair 3-4
PARALLEL MODE channel pair 3-4
BRIDGE MODE channel pair 3-4
1+2
1+2

16
DSP Features in brief
In the BLOCK DIAGRAMS below you can see the CORE DSP processing paths.
NOTE: the DSP INPUT secon is always fully editable by the user, but the OUTPUT secon can have restricons for
FACTORY or PROTECTED presets. In those presets some parameters can’t be edited or viewed.
For STEREO and PARALLEL conguraons ganging opon is available for input and output, to pair easily the secons of
the CORE DSP processed channels.
Speaker protecon seng
Replacing a professional speaker is an expensive cost and reducing this risk is good, so many users want to know how
to set a limiter properly for the speaker protecon.
The QC ampliers like the loudspeaker processor can protect the speaker from excessive heang using the OUTPUT
LIMITER, though it is not possible to
protect a speaker from every possible
cause that occurs to damage it, over-
excursion, very unnatural sound signals
or an erroneous cross-over lter seng
and so on could damage a speaker.
To protect a speaker from over heang
you have to know some its technical
data:
1) The speaker power handling
(PAES) measured with the AES2-1984
(r2003) standard (AES Recommended
Pracce - Specicaon of loudspeaker
components used in professional audio
and sound reinforcement), usually it
is indicated in the speaker technical
data in WAES, this standard is actually
the best method to know the power
handling capability of the speaker for
a standard music program. In case of
a group of speaker connected to the
same channel you have to consider the
whole power handling.
2) The nominal impedance (ZNOM)
of the speaker and/or the resulting
nominal impedance of the group
of speaker connected at the same
amplifier channel (typically 4 or
8 ohm). So to calculate the limiting
threshold a simplied expression must
be executed:
delay limiter
gain phase mute
out
Dynamic Eq. filters
parametric/shelving
5 band parametric
or shelving filters
xover
LPHP
VU meter
level
1 2 3 451 2 3
user parameters for each OUTPUT CORE DSP secon
compressor/limiter delay
5 band parametric
or shelving filters
12 3 4 5
mute phase level
VU
meter
user parameters for each INPUT CORE DSP secon
ܵ݅݉݌݈݂݅݅݁݀ ݁ݍݑܽݐ݅݋݊ ݐ݋ ݈ܿܽܿݑ݈ܽݐ݁ ݐ݄݁ ݋ݑݐ݌ݑݐ ݈݅݉݅ݐ݁ݎ ݐ݄ݎ݁ݏ݄݋݈݀:
ܱܷ݈ܶ݅݉݅ݐ݁ݎ (ௗ஻)= 20 כ ܮ݋݃ଵ଴ ඥܲ
஺ாௌ כ ܼேைெ
ඥܲெ஺௑ כ ܼ௅ை஺஽
ݓ݄݁ݎ݁:
ܱܷ݈ܶ݅݉݅ݐ݁ݎ(ௗ஻)=݋ݑݐ݌ݑݐ ݈݅݉݅ݐ ݐ݄ݎ݁ݏ݄݋݈݀ ݅݊ ݀ܤ ݎ݈݁ܽݐ݁ ݐ݋
ݐ݄݁ ݉ܽݔ݅݉ݑ݉ ݌݋ݓ݁ݎ ,݈ܽݓܽݕݏ ݊݁݃ܽݐ݅ݒ݁.
ܲ஺ாௌ =ܵ݌݁ܽ݇݁ݎ ݌݋ݓ݁ݎ ݄݈ܽ݊݀݅݊݃ ݅݊ ܹ
஺ாௌ
ܼேைெ =ܵ݌݁ܽ݇݁ݎ ݊݋݈݉݅݊ܽ ݅݉݌݁݀ܽ݊ܿ݁,ݑݏݑ݈݈ܽݕ 4݋ݎ 8ߗ.
ܲெ஺௑ =ܯܽݔ݅݉ݑ݉ ܿ݋݊ݐ݅݊ݑ݋ݑݏ ݋ݑݐ݌ݑݐ ݌݋ݓ݁ݎ
݋݂ ݐ݄݁ ܽ݉݌݈݂݅݅݁ݎ ݅݊ ܹ.
ܼ௅ை஺஽ =ܫ݉݌݁݀ܽ݊ܿ݁ ݋݂ ݐ݄݁ ݈݋ܽ݀ ݂݋ݎ ݐ݄݁ ݏ݌݂݁ܿ݅݅݁݀ ܲெ஺௑
݁ݔܽ݉݌݈݁:ݑݏ݅݊݃ ܽ ܳܥ4.2 ܿܽ݌ܾ݈ܽ݁ ݋݂ ݈݀݁݅ݒ݁ݎ 500ܹ ܽݐ 4ߗ
ݓ݁ ݓܽ݊ݐ ݐ݋ ݎ݁݀ݑܿ݁ ݐ݄݁ ݌݋ݓ݁ݎ ݂݋ݎ ܽ ݏ݌݁ܽ݇݁ݎ ܿܽ݌ܾ݈ܽ݁ ݋݂
݄݈ܽ݊݀݅݊݃ 100ܹ ܽݐ 8ߗ ݏ݋:
ܱܷ݈ܶ݅݉݅ݐ݁ݎ (ௗ஻)= 20 כ ܮ݋݃ଵ଴ ξ100 כ8
ξ500 כ4=െ4݀ܤ

17
To make simpler the limiter threshold seng the following table can be used:
SOME TIPS
• To protect the high frequency drivers from dangerous feedbacks in live environments we suggest to set the limiter
3 dB under the calculated value.
• When you push up the volume of your system you can noce that the low-mid content of the program is usually limited
before the high-mid content. This is due to the fact that low frequencies acvate the limiter before high frequencies,
with the result that the system can sound very harsh. In order to restore the original sound balance you can set the HF
driver limiter threshold a few dBs (usually 3 - 6) below the calculated value.
Single Bridge Single Bridge Single Bridge
Z
NOM
P
AES
(W) ϱϬϬtϰɏ ϭϬϬϬtϴɏ ϭϬϬϬtϰɏ ϮϬϬϬtϴɏ ϮϬϬϬtϰɏ ϰϬϬϬtϴɏ
25 -13,0 -16,0 -19,0
50 -10,0 -13,0 -16,0
75 -8,2 -11,2 -14,3
100 -7,0 -10,0 -13,0
150 -5,2 -8,2 -11,2
200 -4,0 -7,0 -10,0
250 -3,0 -6,0 -9,0
300 -2,2 -5,2 -8,2
350 -1,5 -4,6 -7,6
400 -1,0 -4,0 -7,0
450 -0,5 -3,5 -6,5
500 0,0 -3,0 -6,0
600 -2,2 -5,2
700 -1,5 -4,6
800 -1,0 -4,0
900 -0,5 -3,5
1000 0,0 -3,0
1250 -2,0
1500 -1,2
1750 -0,6
2000 0,0
25 -10,0 -16,0 -13,0 -19,0 -16,0 -22,0
50 -7,0 -13,0 -10,0 -16,0 -13,0 -19,0
75 -5,2 -11,2 -8,2 -14,3 -11,2 -17,3
100 -4,0 -10,0 -7,0 -13,0 -10,0 -16,0
150 -2,2 -8,2 -5,2 -11,2 -8,2 -14,3
200 -1,0 -7,0 -4,0 -10,0 -7,0 -13,0
250 0,0 -6,0 -3,0 -9,0 -6,0 -12,0
300 -5,2 -2,2 -8,2 -5,2 -11,2
350 -4,6 -1,5 -7,6 -4,6 -10,6
400 -4,0 -1,0 -7,0 -4,0 -10,0
450 -3,5 -0,5 -6,5 -3,5 -9,5
500 -3,0 0,0 -6,0 -3,0 -9,0
600 -2,2 -5,2 -2,2 -8,2
700 -1,5 -4,6 -1,5 -7,6
800 -1,0 -4,0 -1,0 -7,0
900 -0,5 -3,5 -0,5 -6,5
1000 0,0 -3,0 0,0 -6,0
1250 -2,0 -5,1
1500 -1,2 -4,3
1750 -0,6 -3,6
2000 0,0 -3,0
2500 -2,0
3000 -1,2
3500 -0,6
4000 0,0
QC2.4
Speaker Handling
ϴɏ
OUTlimit (dB)
ϰɏ
QC4.2
QC4.4

18

19

REV. 40/15 CODE 96MAN0105
PROEL S.p.A.
(World Headquarter)
Via alla Ruenia 37/43
64027 Sant’Omero (TE) - ITALY
Tel: [phone]
Fax: [phone]
www.proel.com