Q4 audio DPI 40 User manual

DPI Series
User manual
Prelimenary
Professional Power Amplifiers
R
DPI 102 x 300 W
DPI 15 2 x 500 W
DPI 202 x 800 W
DPI 302 x 1.100 W
DPI 402 x 1.500 W

DPI SERIES USER MANUAL
1
Introduction
Thank you for choosing the Q4audio DPI series for your ap-
plication. You have made an excellent choice. DPI series is part
of a new breed of power ampliers using our proprietary switching
output stage, also called class D (CLD) topology.
The rugged steel chassis and conventional power supply
based on a low ux toroïdal transformer make it a perfect match
for applications where portability is not a premium requirement.
DPI incorporates unique features that require some study be-
fore being applied. One of these features is the EFL® (Extended
Feedback Loop) remote sensing technique. If you intend to use
this feature read the section on this subject carefully.
Summit Engineering nv
Q4audio division
Tongersesteenweg 190
3800 Sint Truiden
Belgium
tel: [phone]
fax: [phone]
www.Q4audio.com
email: [email protected]
SEPN: 17000-00061
Rev. 1
Q4audio is a registered trademark of Summit Engineering nv
All other trademarks are property of their respective owners

DPI SERIES USER MANUAL
2
Table of contents
Introduction............................................................................................................................................................................................... 1
1. Safety Symbols..................................................................................................................................................................................... 3
2. Safety Instructions................................................................................................................................................................................4
3. DPI series Features.............................................................................................................................................................................. 4
4. Setting up the amplier......................................................................................................................................................................... 5
4.1 Unpacking the unit .................................................................................................................................................................. 5
4.2 Attaching / removing the fancover........................................................................................................................................... 5
5. Connecting the amplier....................................................................................................................................................................... 6
5.1 Familiarisation with the rear panel .......................................................................................................................................... 6
5.2 Conguartion (dipswitch setting) ............................................................................................................................................. 6
5.3.1 Input connections...................................................................................................................................................... 7
5.3.3 Speaker connections ................................................................................................................................................ 7
5.3 Connections ............................................................................................................................................................................ 7
5.3.2 PIM-SIM1 module ..................................................................................................................................................... 7
5.3.4 Mains connection...................................................................................................................................................... 8
6. Operation.............................................................................................................................................................................................. 9
7. Grounding........................................................................................................................................................................................... 10
8. Specications ..................................................................................................................................................................................... 11
9. Dimensions......................................................................................................................................................................................... 12
10. Warranty ............................................................................................................ 13
Service request form .............................................................................................................................................................................. 14

DPI SERIES USER MANUAL
3
Explanation of grahical symbols:
This symbol is intended to alert the user of pres-
ence of uninsulated dangerous voltage within
the products enclosure that may be of sufcient
magnitude to constitute risk of electric shock to
persons.
This symbol is intended to alert the user on the
presence of important operating and mainte-
nance (servicing) instructions in the literature
accompanying the appliance.
Explication des symboles graphiques:
Ce symbole doit alerter l’utilisateur du danger
provenant d’un voltage dangereux et non
protégé à l’intérieur de l’appareil, voltage suf-
samment fort pour représenter un danger réel
d’électrocution.
Ce symbole doit attirer l’attention de l’utilisateur
sur les instructions importantes qui concernent le
service et la maintenance et qui accompagnent
tout appareil.
Erklärung der Bildsymbole:
Dieses Symbol warnt den Benutzer vor nicht
isolierter gefährlicher Spannung im Inneren
des Gerätes. Diese Spannung ist hoch genug
um Personen durch elektrischen Schlag zu
gefährden.
Dieses Symbol weist den Benutzer auf wichtige
Bedienungs- und Wartungsanweisungen hin die
in den gerätebegleitenden Unterlagen aufgeführt
werden.
Note: This equipment has been tested and found to comply with EN55103-1and EN55103-2 product specications. These product
specications are designed to provide a reasonable protection against harmful interference. This equipment generates, uses and can
radiate radio frequency energy and, if not installed and used in accordance with instructions, can cause harmful interference. There is
no guarantee that interference will not occur in a specic installation. If harmful interference is detected try and correct it by one of the
following measures:
• Increase the separation between the equipment.
• Connect the equipment to different mains outlets.
• Reroute cables.
1. Safety Symbols
CAUTION: To reduce the risk of electric shoc, do not open.
No user-serviceable parts inside. Refer servicing to qualied
personnel.
WARNING: To prevent re or electric shoc, do not expose this
equipment to rain or moisture.
ATTENTION: Pour éviter les risques de choc électrique, ne
pas ouvrir. Cet appareil ne comporte aucune pièce pouvant
être réparée par l’utilisateur. Coner l’entretien à un technicien
qualié.
AVERTISSEMENT: Pour éviter les risques de choc électrique
ou d’incendie, n’exposez cet appareil ni à l’humidité ni à l’eau
(pluie...).
ACHTUNG: Um Gefährdung durch elektrischen Schlag zu
vermeiden darf das Gerät nicht geöffnet werden. Es benden
sich keine vom Benutzer reparierbaren Teile im inneren des
Gerätes.Jegliche Reparatur soll einem qualizierten Fachmann
uberlassen werden.
WARNUNG: Um die Gefahr eines Feuers bzw. eine Verletzung
durch elektrischen Schlag zu vermeiden sollte das Gerät niemals
Regen oder Feuchtigkeit ausgesetzt werden.
!
!
!
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN !
ATTENTION
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR !
ACHTUNG
GEFAR FUR ELEKTRISCHEN
SCHLAG
GERÄT NICHT ÖFFNEN !

DPI SERIES USER MANUAL
4
2. Safety Instructions
All safety and operation instructions must be read before this
unit is operated.
The safety and operating instructions must be retained with
the unit for future reference.
All warnings on the appliance and in this operation manual
must be strictly followed.
This unit must not be used near water - for example, near
bathtub, washbowl, kitchen sink, laundry tub, in a wet base-
ment, near a swimming pool, etc.
This unit must be placed away from heat sources, such as
radiators or other heat producing devices.
The power supply cord must be routed so that it is not likely
to be stepped on or pinched by objects placed on or against
it.
The power cord of the unit must be unplugged from the mains
outlet if the unit is not used for a longer period.
Care must be taken that objects do not fall and liquids are not
spilled into the inside of the unit.
Unplug the unit and demand servicing by qualied service
personnel under any of the following conditions:
• Objects have fallen, or liquid has been spilled into the unit;
• The unit has been exposed to rain;
• The unit does not appear to operate normally or exhibits a
marked change in performance;
• The unit has fallen, or its chassis got damaged;
• The power cord or power plug are damaged.
The user must not attempt to service the unit beyond those
means described in this operating manual. All other servicing
must be referred to qualied personnel.
To prevent electric shock do not use the polarised plug with
an extension cord, receptacle or other mains outlet unless the
prongs can be fully inserted to prevent contact exposure. This
unit is equipped with a single pole disconnect device (fuse) in
the phase (live) wire. If an unpolarised mains connection is
used, the receptacle the unit is connected to must be equipped
with a two pole disconnect device (fuse) of appropriate rating.
The dust lter cover on the front of the unit forms an integral
part of the electrical safety provisions. Do not use the unit
without the dust lter cover in place!
Precautions should be taken so that the grounding and mains
polarisation means of the unit are not defeated.
Slots and openings in the unit are provided for ventilation. To
ensure reliable operation and to prevent overheating of the
unit, these openings must not be blocked or covered!
The fanguard on the front of the unit is an integral part of the
safety provisions of the DPI amplier. Make sure it is correctly
mounted before connecting the unit to a mains outlet.
3. DPI series Features
DPI series power ampliers feature:
 Switching class D output stage.
 Fully symmetrical, and oating modulator for unsurpassed
accuracy and cross channel separation.
 Open input architecture for future expansion. The stand-
ard input module PIM-SIM1 providesinputs on Neutrik®
Combo connectors or Phoenix screw terminals, parallel link
outputs on XLR-3M for easy routing of multiple ampliers and
selectable high pass lters with 30 and 50Hz second order
high pass lter characteristic.
 Instant recovery, eliminating stitching of the output when
recovering from clipping or overload.
 EFL® (Extended Feedback Loop). This inovating technique
makes it possible to take the feedback for the amplier right
from the loudspeaker terminals, offering unprecedented con-
trol of the loudspeaker, independent on loudspeaker cable
length. The amplier can be used as a conventional amplier
without this feature enabled, without any inconveniences.
 Defeatable clip limiter with selectable response time.
 Minimum sample frequency selection.
 Protection against over-dissipation, open or short circuit and
HF or DC at the output.
 Outputs on touch proof Neutrik® Speakon connectors and
high current Phoenix® screw terminals. Speakons have
integral sensing inputs for the EFL circuit.
 Low ux toroïdal power transformer with thermal sensing.
The output power of the ampliers is reduced in case of
overheating.
 Extensive power line ltering for minimal interference.
 Soft start to minimise current surge on power on.
 A high efciency cooling system. The power transistors are
mounted directly onto the heatsink, eliminating the high
thermal resistance of electrical insulators. This reduces
component temperatures and extends the life of the power
components.
 Temperature proportional speed fans for quiet operation.
 Front to back air ow.
 Easy to clean air lter on the front.

DPI SERIES USER MANUAL
5
4.1 Unpacking the unit
4. Setting up the amplier
DPI ampliers are packed in a strong cardboard box that pro-
tects it during transport. In case you ever need to ship the ampli-
er again it is best to pack it using the original packaging materials.
Therefore it is advised to save all packaging materials.
The packaging has been specially studied for low load to the
environment. The individual packaging materials can be easily
separated and recycled.
Please inspect the unit carefully for any signs of damage
incurred during transport. This DPI amplier has undergone
stringent quality control inspection and tests at the factory. It
left in perfect condition. If damage is found notify the transport
company immediately.
It is important to immediately mount the fanguard that is
included in the box. It is an integral part of the electrical safety
provisions of the unit.
When repacking the unit, use the same packing
arrangement as shown in the picture. Make sure
to remove the fanguard. Place it on the side of the
unit, between the two side buffers. This protects the
fanguard during transport.
Warning: Before continuing the installa-
tion of the DPI amplier, mount the fan-
guard on the front of the unit.
READY/PROTECT
SIGNAL
BRIDGE
CLIP/NLR
CH2
-dB
CH1
-dB
TEMPLIMIT/TCL
SUPPLYOVL
0
2
4
6
8
10
12
14
0
2
4
6
8
10
12
14
PROFESSIONALCLASS-DPOWERAMPLIFIER
POWERON
REMOTE
ACTIVECALL
10
EXAMINEEQUIPMENTCAREFULLYFOR
SHIPPINGDAMAGE.IFDAMAGEIS
FOUNDNOTIFYTHECARRIERWHO
MADEDELIVERY.DEMANDAN
INSPECTIONANDASIGNEDDAMAGE
REPORT
.
THISPACKAGINGISMADEFROMFULLY
RECYCLABLEMATERIALS.KEEP
PACKAGINGFORFUTUREUSEOR
DISPOSEOFPROPERLY
.
DPISeries
Usermanual
Prelimenary
ProfessionalPowerAmplifiers
R
DPI10
2x300W
DPI15
2x500W
DPI20
2x800W
DPI30
2x1.100W
DPI40
2x1.500W
SIGNAL
o
o
4
6
8
10
12
14
18
24
REMOTE
ACTIVECALL
Place the two tabs of the fanguard in the corresponding holes
on the right of the unit. Push the fanguard against the front panel
and secure it by turning the 1/4 turn lock 90° clockwise.
DPI series ampliers are equipped with two cooling fans with
front to rear airow. When installing the amplier, allow for ample
space behind the amplier to ensure sufcient airow, especially
if the amplier is operated in a rack system. This avoids thermal
limiting of the output power or, in severe situations even shut-off
by the thermal protection system.
The fancover can be easilly removed by turning the 1/4 turn
lock 90° counterclockwise and pulling it off the frontpanel, left
side rst.
The standard air lter delivered with the amplier is a black,
8mm thick reticulated polyurethane foam with a density of 20PPI.
The lter can be easilly cleaned by rinsing it with water. Let it dry
thouroughly before mounting it back onto the amplier.
In case you need to replace the lter use only the prescribed
material and thickness or contact your distributor for a replace-
ment.
Do not use the amplier without the airlter in place.
Regular cleaning of the lter eliminates dust buildup inside the
unit.
4.2 Attaching / removing the fancover
!
!

DPI SERIES USER MANUAL
6
5. Connecting the amplier
5.1 Familiarisation with the rear panel
1 Channel 1 output is available on parallel wired Neutrik 4 pole
Speakon and Phoenix screw terminal. Wiring of the Speakon
is as follows:
1+ = Channel output positive
1- = Channel output negative (ground)
2+ = Channel sense input positive
2- = Channel sense input negative (ground sense)
2 Bridge output is available on Neutrik 4 pole Speakon. Another
possibility to connect the bridge output is to use the Ch1 and
Ch2 Phoenix OUT+ terminals. In this case Ch1 OUT+ is the
positive output pole and Ch2 OUT+ the negative. Wiring is
as follows:
1+ = Bridge output positive
1- = Bridge output negative
2+ = Bridge sense input positive
2- = Bridge sense input negative
1 3 4 52 6 7
OUT+ OUT SENSE
+
CH1
OUT+ OUT SENSE CONFIGURATION
+
CH2
WARNING:
RISK OFHAZARDOUSENERGY!
MAKE PROPERSPEAKERCONNECTIONS- SEE
OPERATING MANUALBEFORE USE.
MAINS FUSE
MAINS INPUT
ATTENTION: RISQU E
D'INCENDIE! R EMPLACEZ
UNI QUE MEN T PAR UN
FUSIBLE DE MEME TYPE ET
VALEUR - CONSULTEZ LA
PLAQUEDE MARQUAGE.
WARNING: TOREDUCE THE RISK
OF FIRE OR ELECTRIC SHOCK DO
NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE. NO USER
SERVICEABLEPARTS INSIDE.REFER
SERVICING TO QUALIFIED PERSON-
NEL. READ INSTRUCTION MANUAL
CAREFULLY BEFORE USE.
WARNING: TOREDUCE THE RISK
OF FIRE OR ELECTRIC SHOCK DO
NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE. NO USER
SERVICEABLEPARTS INSIDE.REFER
SERVICING TO QUALIFIED PERSON-
NEL. READ INSTRUCTION MANUAL
CAREFULLY BEFORE USE.
CLASS1 EQUIPMENT
MUST BEEARTHED!
!
AVIS
RISQUE DE CHOC
ELECTRIQUE
NE PAS OUVRIR
CAUTION
RISK OF ELECTRIC
SHOCK
DO NOT OPEN
ATTACH TYPE LABEL TOTHISLOCATION. THIS
LABEL CONTAINS IMPORTANT SAFET Y
INFORMATIONAND MUSTNOT BE REMOVED.
REPLACE LABEL IN CASE IT GOT DAMAGED
OR LOST.
CAUTION:
FIRE HAZARD!
REPLACE ONLY WITH SAME
FUSE TYPEAND RATING- SEE
TYPE LABEL.
CH2ON/OFF
CH2SLOW
CH1ON/OFF
CH1SLOW
CH1FSMIN
CH2FSMIN
BRIDGE
L
O
C
K
L
O
C
K
L
O
C
K
CLIP LIMITER
ON
BRIDGE MODE:
SWITCHES 1 AND
2 ON USE CH1
INPUTAND LEVEL
CONTROL. CH2
INPUTAND LEVEL
BRIDGE MODE:
SWITCHES 1 AND
2 ON USE CH1
INPUTAND LEVEL
CONTROL. CH2
INPUTAND LEVEL
1+
1
2+
2
OUT
SENSE+
SENSE
OUT+
SPEAKON
WIRING
BRIDGE
12 3 4 5 6 7 8
Model: DPI 40
Serialnr.: DPI40-01AA-XXXX
Date of manufacture: 28.06.04
Made in Belgium, EU
FUSE: xxx A T / 250 V
Power requirments: 264V AC 50/60Hz 6.000W
8 8
3 Channel 2 output. For more information see Ch1 under point
1.
4 Conguration dipswitches.
5 Peripheral Input Module. DPI series is standard delivered
with the PIM SIM1 analog input module. Do not operate the
amplier without the module in place. The PIM module can be
easilly exchanged for versions with more elaborate features.
6 Mains power cord.
7 Fuseholder. Replace fuse only with same fuse type and
rating. This information is found on the type label, attached to
the rear panel.
8 Ventilation slots. Never cover the ventilation slots. These en-
sure reliable operation and prevent overheating of the unit.
DPI series ampliers are able to work in two main operational
modes that can be selected by the dipswitches (4) on the back
of the unit.
DUAL mode: in this mode both channels and their correspond-
ing in- and outputs work totally independent from eachother.
This is the mode for normal stereo (two-channel) operation.
In dual mode both switch 1 and 2 are in their UP position.
BRIDGE mode is activated by setting switches 1 and 2 in
the ON (down) position.
Bridge mode allows to use the ampliers full output capacity
for one single monaural channel.
This conguration is recommended to produce high power
output for a monaural speaker system, e.g. subwoofer. In ad-
dition to that, any DPI amplier working in BRIDGE mode can
be directly connected to an unisolated 100V (70V) constant
voltage sound system.
FSMIN selection: DPI series ampliers use a variable switch-
ing frequency modulator. As the output signal increases in
amplitude, the switching frequency of the modulator goes
5.2 Conguartion (dipswitch setting)
down. Ultimately the switching frequency goes to zero when
the amplier runs into the supply rails. To avoid this and to
minimise stitching of the output signal after such event, the
modulator continuously monitors the switching frequency
and clips the modulator input signal in case the switching
frequency drops below a predened value. This value can be
adjusted by the dipswitches 3 and 4 resp. for CH1 and CH2.
Switch in the UP position corresponds to 35kHz. Switch in
the down position to 70kHz. It is almost impossible to hear
any difference between both settings. We advise the 70kHz
position for critical listening. The output power will be a few
percent lower when FSMIN 70kHz is enabled, compared to
the 35kHz setting.
The CLIP LIMITER avoids gross clipping of the output signal
in case the FSMIN clipper is activated. Gain is automatically
reduced if the limiter is activated by putting switches 6 (CH2)
and 8 (CH1) in the ON (down) position. Attack and release
times can be adjusted with switches 5 (CH2) and 7 (CH1).
Reaction of the limiter circuit is slowed down by putting these
switches in their ON (down) position.

DPI SERIES USER MANUAL
7
The DPI series ampliers have an open input architecture
for future expansion. Standard, the amplier is equipped with
the PIM-SIM1 module.
5.3.2 PIM-SIM1 module
1. Channel 1 input sockets are mixed XLR/phone jack recepta-
cles, which allow the use of microphone or instrument cables
to connect the amplier. Whenever possible, use 2-conductor
shielded cable for a balanced signal transmission. This gives
the best results and the lowest noise. The inputs are wired in
standard conguration with pin 1 as ground, pin 2 as signal
“hot” and pin 3 as signal “cold”.
Refer to the input wiring diagram on the amplier’s back
panel.
Each input XLR/Phone jack is parallel wired to a Phoenix
screw terminal for easy connections as well as to a ‘Direct Out’
male XLR socket to provide easy linking to other ampliers.
2. Channel 2 input. See Ch1 information under point 1.
All input and output sockets are on the rear panel of the
amplier. The rear panel also holds the mains cord (8) and the
fuse holder (9). For maximum safety, it is recommended to stick
to the order given below when wiring the PA system.
5.3 Connections
5.3.1 Input connections
3. Conguration dipswitches for parallel mode and high pass
lter.
Switches 1 and 2 make it possible to parallel CH1 and CH2
inputs. Put switches in the ON (down) position to wire CH1 and
CH2 inputs in parallel. Use CH1 or CH2 input. The output lev-
els can be adjusted individually by means of the corresponding
level controls.
Switch 3 makes it possible to insert a 50Hz second order high
pass lter into CH1 signal path. Put the switch in the ON (down)
position to activate the lter.
Switch 4 controls CH1 high pass lter frequency. With the
switch in the up position the cutoff frequency is 50Hz. The down
position changes this to 30Hz.
Switch 5 controls CH2 high pass lter mode and switch 6
controls CH2 high pass lter cutoff frequency. Functioning is
the same as for CH1.
Warning: All DPI series ampliers are capable of producing
dangerously high voltages at the output terminals! To avoid
cable overheating, do not use speaker cables under 1.5 mm2
cross-section (AWG 15). The use of thicker cables helps to keep
power loss down and damping high, especially if long distances
have to be bridged. After insertion, twist each speakon connector
clockwise until latching or lock it with the swivell nut to ensure
proper contact.
DUAL mode: use the SPEAKER OUT 1 and 2 outputs to con-
nect the speaker systems. Minimum total speaker impedance
per channel is 2 O hms.
BRIDGE mode: BRIDGED OUT speaker connection is done
by using standard Speakon cables. Minimum total speaker
impedance is 4 Ohms.
5.3.3 Speaker connections
EFL® (Extended Feedback Loop).
This inovating feature makes it possible to take the feed-
back for the amplier right from the loudspeaker terminals, of-
fering unprecedented control of the loudspeaker, independent
on loudspeaker cable length. The amplier can be used as a
conventional amplier without this feature enabled, without any
inconveniences by simply not connecting the sense terminals. In
this case feedback is taken right at the speaker output terminals,
compensating any internal wiring, yielding very high low output
impedance.
The sense inputs give access to highly sensitive
electronic components inside the unit.
Although the amplier is protected against mis-
wiring of the sense inputs, these components
are not resistant to continuous fault situations.
+
CH1
INPUT
INPUT
LINK / OUT
+
CH2
INPUTLINK / OUTGND
1
2
3
SLEEVE
TIP
RING
GND
+
-
PARALLELINPUTS
CH1HP FILTER (ON/OFF) CH2HP FILTER (ON/OFF) CH1HP FREQ. 50Hz 30Hz
INPUT
12 3
ON
CONFIGURATION
INPUT IMPEDANCE: 20K BALANCED
10K UNBALANCED
MODULE: SIM-1
12 3 4 5 6
CH2HP FREQ. 50Hz 30Hz
132
OUT + OUT SENSE
+
CH1
OUT + OUT SENSE
+
CH2
WARNING:
RISK OFHAZARDOUS ENERGY!
MAKE PROPER SPEAKERCONNECTIONS - SEE
OPERATING MANUALBEFORE USE.
L
O
C
K
L
O
C
K
L
O
C
K
1+
1
2+
2
OUT
SENSE+
SENSE
OUT+
SPEAKON
WIRING
BRIDGE
Pin congurations
The pin congurations for the three speaker connectors
are printed on the amplier’s back panel. Before connecting
the speakers, make sure that your speaker cables are properly
wired.
Warning: this mode does not mean that the out-
puts of both channels can be wired in parallel.
Never attempt to wire them together! This can
damage the amplier.
!
!

DPI SERIES USER MANUAL
8
OUT + OUT SENSE
+
OUT + OUT SENSE
+
5.3.4 Mains connection
For mains connection, use only three-prong mains connectors
with earth contact. Switching the amplier to different voltage
systems is done from the inside and should only be performed
by a qualied technician.
The mains cable conductors have the following color code:
YELLOW/GREEN = earth (PE)
BROWN = live (L)
BLUE = neutral (N)
Output cabling for dual (stereo) / parallel (mono) mode:
Preferred Second option
In case the sense inputs are not used leave
them unconnected. The amplifier will then
function as a conventional amplier.
Extra care is needed in case of 4 core cables
to make sure the sense wires are not con-
nected.
In case the sense inputs are used, try the con-
nection with a low level signal at the output. If
the channel goes into protect mode check the
wiring for accordance with the gures below.
Continuous operation into a faulty wiring can

DPI SERIES USER MANUAL
9
Each channel is controlled from the front panel by a level con-
trol potentiometer and 4 status LED’s. The status LED’s indicate
the following operational states of the amplier:
READY/PROTECT: two-coloured LED indicates whether or
not the channel is ready to operate. Lights up green when the
amplier is working normally, and turns red whenever there is a
malfunction, e.g. DC voltage at the output, output stage defect, or
heatsink temperature exceeding 90°C. After turning the amplier
on, this LED will remain red for about 2 seconds until the internal
supply voltages have set to their normal values.
SIGNAL: indicates signal presence at the channel’s output.
Threshold level is +10 dBV.
VOLT CLIP / LIMIT: lights when the amplier has reached
the minimum switching frequency. This is equivalent to clipping
in a normal power amplier. In case the internal clip limiter is
activated, the gain will be automatically reduced to prevent the
occurrence of gross nonlinearity conditions inside the amplier.
The clip limiter keeps signal distortion under 5% and thus
guarantees a clean sound and effective speaker protection.
TCL (Temerature Controlled Limiting): indicates signal
limiting as a result of heat sink over temperature (above 85°C).
This helps to prevent the triggering of the internal thermal shut-off
circuit, which would step in at 90°C heat sink temperature as a
nal safeguarding measure.
The temp limit only becomes active when the regular cool-
ing mechanism fails to work properly, e.g. by a dirty air lter,
obstructed air-ow...
A lit TCL LED should always be taken as a sign to check the
air lter and to assure sufcient cooling air supply.
Further 3 leds give operational information of the unit:
BRIDGE: Indicates the amplier is congured for bridge mode
operation. Use CH1 level control as indicated.
SUPPLY OVL: Indicates a power supply overload. If this LED
is lit, gain of both channels is decreased simultaneously to avoid
overheating of the unit’s power transformer.
REMOTE: Both the ‘ACTIVE’ LED as the CALL button are
functions which require an optional remote module to be inserted
at the back of the unit. Further explanation of the functions will
accompany the remote module. This function is not available
with the PIM-SIM1 standard input module.
6. Operation
READY / PROTECT
SIGNAL
BRIDGE
VOLT CLIP / LIMIT
CH 2
-dB
CH 1
-dB
TEMP LIMIT
SUPPLY OVL
0
oo
2
4
6
8
10
12
14
18
24
0
oo
2
4
6
8
10
12
14
18
24

DPI SERIES USER MANUAL
10
For maximum performance we recommend the use of two
conductor shielded cable for making input connections. Because
the shield does not carry audio signal, interference between signal
current and audio current is minimised in this way. While wiring up
your system take following important points into consideration:
1. Never use a ground lift adapter on the mains feed. The
isolation system of this product takes into account that the chas-
sis is connected to earth at all times. This product will become
unsafe if the chassis is disconnected from earth.
2. Most installations use a mix of balanced and unbalanced
connections with a variety of equipment being connected. In
case you experience a hum or buzz problem, do not be afraid
to experiment.
Pin 1 of the input connectors (and direct out connectors) is
connected to chassis ground. In a perfect world it would be pos-
sible to simply connect the sleeves of the signal cables to pin 1
at both ends of the cable. This would in effect make the cable
screen an extension of the chassis between the two intercon-
nected pieces of equipment and provide for perfect LF and HF
screening of the audio signals.
Problem however is that some equipment use badly organised
internal grounding and will generate hum and buzz because of
earth currents owing through the internal signal ground. In such
case it is necessary to stop the earth currents from owing by
disconnecting pin 1 from the sleeve.
Use the gures below as a guidance to solve problems with
hum or buzz.
7. Grounding
Source
Output
Amplifier
Input
2-wire mains cord
Floating
Balanced
Source
Output
Amplifier
Input
3-wire mains cord
Grounded
Source
Output
Amplifier
Input
2-wire mains cord
Floating
Unbalanced
3-wire mains cord
Source
Output
Amplifier
Input
Grounded

DPI SERIES USER MANUAL
11
Model DPI10 DPI15 DPI20 DPI30 DPI40
Min. output power per channel into 2 ohms 500 W 900 W 1200 W 1600 W 2200 W
1 kHz sine wave, THD < 1%, both channels driven
Min. output power per channel into 4 ohms 300 W 500 W 800 W 1100 W 1500 W
1 kHz sine wave, THD < 1%, both channels driven
Min. output power per channel into 8 ohms 200 W 330 W 450 W 600 W 800 W
1 kHz sine wave, THD < 1%, both channels driven
Min. output power in bridge mode into 4 ohms 1000 W 1800W 2400 W 3200 W 4400 W
1 kHz sine wave, THD < 1%
Min. output power in bridge mode into 8 ohms 600 W 1000 W 1600 W 2200 W 3000 W
1 kHz sine wave, THD < 1%
Typical THD+N < 0.02 %
1 KHz -3dB output power
SMPTE intermodulation distortion < 0.05 %
60 Hz - 7 KHz 4:1 at -3dB output power
Dynamic intermodulation distortion < 0.05 %
30 KHz bandwidth at -3dB output power
Frequency range + 0 dB / - 0.8 dB
20 Hz - 20 kHz at nom. output power
Small Signal Frequency response 5 Hz - 50 kHz
-3dB; Load impedance 2 - 16 Ohms
Large Signal Bandwidth 35 kHz
Rise time < 10 µs
Damping factor > 3000 (EFL used)
1 KHz referred to 8 ohms
Voltage gain +36 dB
Level controls full cw
Noise interference < -105 dB
22 Hz - 22 KHz rms A weighted, referred to nom. output power
Crosstalk < -70 dB
1 KHz / 8 ohms
Input CMRR > 80 dB
100 Hz
Output DC offset voltage < ±25 mV
Input impedance 10 Kohms unbalanced / 20 Kohms balanced
Input connectors 1/4” phone jack / XLR compound receptacle, parallel XLR male
parallelled Phoenix® screw terminals
Output connectors 1 x 4-pole Speakon per channel / 1 x 4-pole Speakon for bridge
parallelled Phoenix® 4 mm² screw terminals
Cooling Forced cooling with 2 vari-speed fans / front to rear airow
Mains supply 115 V / 230 V ±10% AC 50/60 Hz
Dimensions Width: 482 mm, Height: 88.9 mm, Depth: 350 mm
(mounting base to connector panel)
Net weight 13.5 kg 15 kg 16 kg 18 kg 20 kg
Shipping weight 16.3 kg 18 kg 19 kg 21 kg 23 kg
Standards Safety: EN60065 EMC: EN55103-1/EN55103/2/E2/E3
Note: Distortion measurements with AES-17 low pass lter.
8. Specications

DPI SERIES USER MANUAL
12
9. Dimensions
READY / PROTECT
SIGNAL
BRIDGE
VOLT CLIP / LIMIT
CH 2 -dB CH 1 -dB
TEMP LIMIT
SUPPLY OVL
0
oo
2
4
6
8
10
12
14
18
24
0
oo
2
4
6
8
10
12
14
18
24
PROFESSIONAL POWER AMPLIFIER
POWER ON
OUT+ OUT SENSE
+
CH1
OUT+ OUT SENSE CONFIGURATION
+
CH2
WARNING:
RISKOFHAZARDOUSENERGY!
MAKEPROPERSPEAKERCONNECTIONS- SEE
OPERATINGMANUALBEFOREUSE.
MAINS FUSE
MAINS INPUT
ATTENTIO N: RISQUE
D'INCENDIE! REMP LACEZ
UNIQ UEME NT PAR UN
FUSIBLE DE MEME TYPE ET
VALEUR - CONSULTEZ LA
PLAQUEDE MARQUAGE.
WARNING: TOREDUCE THERISK
OF FIRE OR ELECTRIC SHOCK DO
NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE. NO USER
SERVICEABLEPARTSINSIDE.REFER
SERVICING TOQUALIFIEDPERSON-
NEL. READ INSTRUCTION MANUAL
CAREFULLYBEFOREUSE.
WARNING: TOREDUCE THERISK
OF FIRE OR ELECTRIC SHOCK DO
NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE. NO USER
SERVICEABLEPARTSINSIDE.REFER
SERVICING TOQUALIFIEDPERSON-
NEL. READ INSTRUCTION MANUAL
CAREFULLYBEFOREUSE.
CLASS1 EQUIPMENT
MUSTBE EARTHED!
!
AVIS
RISQUE DE CHOC
ELECTRIQUE
NE PAS OUVRIR
CAUTION
RISK OF ELECTRIC
SHOCK
DO NOT OPEN
ATTACHTYPELABELTO THISLOCATION. THIS
LABEL CONTAINS IMPORTANT SAFETY
INFORMATIONAND MUSTNOTBE REMOVED.
REPLACE LABEL IN CASE IT GOT DAMAGED
ORLOST.
CAUTION:
FIRE HAZARD!
REPLACE ONLY WITH SAME
FUSE TYPEAND RATING- SEE
TYPELABEL.
CH2ON/OFF
CH2SLOW
CH1ON/OFF
CH1SLOW
CH1FSMIN
CH2FSMIN
BRIDGE
L
O
C
K
L
O
C
K
L
O
C
K
CLIPLIMITER
ON
BRIDGEMODE:
SWITCHES 1 AND
2 ON USE CH1
INPUTAND LEVEL
CONTROL. CH2
INPUTAND LEVEL
BRIDGEMODE:
SWITCHES 1 AND
2 ON USE CH1
INPUTAND LEVEL
CONTROL. CH2
INPUTAND LEVEL
1+
1
2+
2
OUT
SENSE +
SENSE
OUT+
SPEAKON
WIRING
BRIDGE
12 3 4 5 6 7 8
+
CH1
INPUT
INPUT
LINK / OUT
+
CH2
INPUTLINK / OUTGND
1
2
3
SLEEVE
TIP
RING
GND
+
-
PARALLELINPUTS
CH1HP FILTER(ON/OFF) CH2HP FILTER(ON/OFF) CH1HP FREQ.50Hz 30Hz
INPUT
12 3
ON
CONFIGURATION
INPUTIMPEDANCE: 20KBALANCED
10KUNBALANCED
MODULE: SIM-1
12 3 4 5 6
CH2HP FREQ.50Hz 30Hz
Model: DPI 40
Serialnr.: DPI40-01AA-0001
Date of manufacture: 28.06.04
Made in Belgium, EU
FUSE: xxx A T / 250 V
Power requirments: 264V AC 50/60Hz 6.000W
3,50
360,00
372,00 357,00
445,00
482,60
88,50
51,00

DPI SERIES USER MANUAL
13
10. Warranty
SUMMARY
The Q4AUDIO division of Summit Engineering nv Tongersesteenweg 190 3800 Sint-Truiden Belgium, the creators and manufacturers
of the Q4AUDIO product line warrants to you, the original purchaser and any subsequent owner of this Q4AUDIO product, for a period
of 2 (two) years (warranty period) from the date of purchase by the original purchaser that the product is free of defects in components
and factory workmanship. The date of purchase is the date appearing on the rst end-user’s sales receipt or other proof of original
purchase from an authorised Q4AUDIO dealer.
ITEMS EXCLUDED FROM WARRANTY
This Q4AUDIO warranty does not cover product failure caused by misuse, accident or neglect. Nor shall it be applicable to any product
on which the serial number has been defaced, altered or removed. This warranty shall be considered void if this product is subjected to
repair work or alteration by persons other than authorised by Q4AUDIO in such a manner as to injure, in the sole judgment of Q4AUDIO,
the performance, stability, reliability or safety of this product. This warranty does not apply to nish or appearance items. This warranty
is in effect only during the warranty period.
OUR COMMITMENT
During the warranty period, Q4AUDIO will remedy any defect (except as excluded) by repair or at its option replacement or refund. In
case of refund the defective or malfunctioning product shall be made available to us free and clear of all lies or other encumbrances. The
refund will be equal to the original purchase price less a reasonable depreciation of 10% per year from the date of purchase. The refund
will not include interests, insurance, closing costs, loss of prot or other nancial costs that may be the result of the product’s defect.
OBTAINING WARRANTY SERVICE
You must notify us of your need for warranty service, preferably by lling out the service request form in this manual and returning it to
us. We will give you notice of the authorised service center to whom you may deliver the product or we will give you an authorisation to
return it to the factory. All components must be shipped in a factory pack, shipping prepaid. Repairs and replacement parts provided
under the terms of this warranty shall carry only the unexpired portion of this warranty.
DISCLAIMER
Q4AUDIO is not liable for any damage to other products such as speakers, ampliers or any other equipment that is caused by using
this Q4AUDIO product.
PRODUCT CHANGES
We reserve the right to change the design on any product without prior notice and with no obligation to make corresponding changes
in products previously manufactured.
Summit Engineering nv
Q4AUDIO division
Tongersesteenweg 190
3800 Sint-Truiden
Belgium
tel: [phone]
fax: [phone]
www.Q4audio.com
email: [email protected]

DPI SERIES USER MANUAL
14
Service request form
Send this service request form together with the unit (do not send separately!) to your authorised
Q4audio dealer, or to following address:
Summit Engineering NV
Q4audio division
Tongersesteenweg 190
3800 Sint-Truiden Belgium
Tel: [phone]
Fax: [phone]
Email: [email protected]
Attempts to solve the problem
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Problem description Be sure to explain the circumstances under which the problem occurred!
..........................................................................................................................................................
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Product information
Product:: ...........................................................................................................................................
Serial number: ..................................................................................................................................
Purchased from: ...............................................................................................................................
Purchase date:..................................................................................................................................
Owner information
Name/Company: ..............................................................................................................................
Shipping addess: .............................................................................................................................
..........................................................................................................................................................
Country: ...........................................................................................................................................
Tel: ....................................................................................................................................................
Fax: ...................................................................................................................................................