powersoft DigiMod 3004PFC4 User manual

Keep This Manual For Future Reference
© 2012 - 2013 Powersoft
powersoft_dm3004PFC4_uguide_en_v1.1
user manual
DigiMod 3004PFC4
rev. 1.1

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DigiMod 3004PFC4
User Manual
Table of contents
1 Welcome 5
2 Unpacking & checking for shipping damage 5
3 Disposal of the packing material 5
4 Important safety instructions 6
5 Precautions regarding installation 6
5.1 Location 6
5.2 Wiring 6
5.3 Fire and liquids 7
6 Thermal constrains 7
7 Mechanical Drawing 8
8 Main connections 9
9 Main connectors pinout 10
9.1 Bill of connectors 10
9.2 PL1003 pinout 12
9.3 PL3003 pinout 14
9.4 PL1000 Pinout 16
9.5 PL2000 Pinout 16
9.6 PL3000 Pinout 16
9.7 PL4000 Pinout 16
10 Audio path block diagram 17
11 Internal Signal Path Polarity 17
12 Protections 18
12.1 Power supply protections 18
12.2 Amplier protections 18
12.3 Harmful signal protections 19
12.4 Auxiliary power protections 19
12.5 Control Board protection LEDs 19
13 LED chart 20
13.1 Control Board LED chart 20
13.2 Main Board LED chart 20
14 Service 21
15 Warranty 21
15.1 Return of Goods 21
15.2 Repair or replacement 21
15.3 Cost and responsibility of transport 21
16 Assistance 21
17 Specications 22
3

4
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1 Welcome
Congratulations on your purchase of the Powersoft
DigiMod 3004PFC4 module.
We know you are eager to use the DigiMod 3004PFC4
module, but please take a moment to read this user’s manual and
safety instructions. In case you have any questions, please do not
hesitate to contact your dealer or Powersoft.
The DigiMod 3004PFC4 is a four channel amplier modules
specically designed to drive high power loudspeakers.
The DigiMod 3004PFC4 represents an important evolution in
the DigiMod Series family of products: delivering up to 1000 W
on 4 � per channel (2000 W on 8 � in mono-bridged mode), the
DigiMod 3004PFC4 reaches a new level of excellence in terms of
power consumption and sonic performance.
The xed frequency switching mode technology design
guarantees maximum performances, high efciency and
predictability ensuring total immunity from intermodulation
artifacts. The new design of the power supply equipped with PFC
and Smart Rails Management reduces power consumption and
enhances reliability and consistency in all operating conditions.
The DigiMod 3004PFC4 shares the same compact mechanical
layout of the other DigiMod Series models guaranteeing scalability
to existing and future implementations and is fully compatible with
all existing Powersoft DSP solutions providing a powerful and
exible signal processing tools on board of your loudspeaker.
DigiMod 3004PFC4
User Manual
2 Unpacking & checking for shipping damage
Your Powersoft product was completely tested and inspected
before leaving the factory. Carefully inspect the shipping package
before opening it, and then immediately inspect your new product.
If you nd any damage notify the shipping company immediately.
3 Disposal of the packing material
The transport and protective packing has been selected from
materials which are environmentally friendly for disposal and can
normally be recycled.
Rather than just throwing these materials away, please ensure
they are offered for recycling.
5

4 Important safety instructions
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT ATTEMPT TO OPEN ANY PART OF THE UNIT. NO
USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
WARNING: TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPARATUS TO RAIN OR
MOISTURE. OBJECTS FILLED WITH LIQUIDS, SUCH AS VAS-
ES, SHOULD NOT BE PLACED ON THIS APPARATUS.
CHECK PROPER CHASSIS EARTH CONNECTION
BEFORE OPERATE.
SAFEGUARDS: This unit has been engineered and manufactured
to assure your personal safety. Improper use can result in potential
electrical shock or re hazards. In order not to defeat the safe-
guards, observe the following instructions for its installation, use
and servicing.
fRead these instructions.
fKeep these instructions.
fHeed all warnings.
fFollow all instructions.
fDo not use this amplier near water.
fClean only with a dry cloth.
fEnsure a proper ventilation.
fInstall in accordance with Powersoft’s instructions.
fDo not install near any heat sources or apparatus that
produce heat.
fOnly use attachments/accessories specied by Powersoft.
EXPLANATIONS OF GRAPHICAL SYMBOLS
The Lightning Flash with arrowhead symbol within an
equilateral triangle is intended to alert the user to the
presence of uninsulated “dangerous voltage” within the
product enclosure that may be of sufcient magnitude to
constitute a risk of shock to persons.
The Exclamation Point within an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the
literature accompanying the product.
NOTES: This equipment has been tested and found to comply
by Competent Body (Directive 2004 /108 / EC) pursuant to the
product family standard for audio professional use:
fEN 55103-1 and EN 55103-2 standard (with the limits for E4
and E5 electromagnetic environment);
fEN 61000-3-2 and EN 61000-3-3 standard.
This equipment has been tested and found to comply by Notied
Body 2014 (Directive 2006 / 95 / EC) pursuant to the audio appa-
ratus safety requirements: Standard EN 60065.
This amplier is intended to be installed inside other devices and
must be checked in the nal product.
5 Precautions regarding installation
5.1 Location
Install the amplier in a ventilated enclosure (IP20 at least),
where it will not be directly exposed to high temperature
or humidity.
Do not install the amplier in a location that is exposed to direct
rays of the sun, or near to hot appliances or radiators. Excessive
heat can adversely affect the operation and internal components.
Installation of the module in a damp or dusty environment may
result in malfunction or accident.
Placing and using the amplier for long periods on heat-
generation sources will affect performances. Avoid placing
the amplier on heat-generating sources. Install this amplier as far
as possible from tuners and TV sets. An amplier installed in close
proximity to such equipment may cause noise or degradation of
the picture.
5.2 Wiring
This device must be powered exclusively by earth con-
nected mains sockets in electrical networks compliant to
the IEC 364 or similar rules. Is absolutely necessary to verify this
fundamental requirement of safety and, in case of doubt, require
an accurate check by a qualied personal.
Is absolutely necessary to ground this device using the proper
earth connection on the metal frame of the chassis; use M4 nut
and bolt with proper split washer – Grover washer – to secure
the earth terminal lug.
POWERSOFT cannot be considered responsible for eventual
damages caused to persons, things or data for the missing
of accurate earth link.
Provide the installed unit with bipolar switch to unconnect
both mains connection with at least 3 mm – 118 mil – of
distance between switch contacts.
Before powering this device verify that the module is sup-
plied with the correct voltage rating.
Verify that your mains connection is capable to satisfy the power
ratings of the device.
Do not use this unit if the electrical power cord is frayed
or broken. Do not remove the cover. Removing the cover
will expose you to potentially dangerous voltage.
The amplier itself, its input mains and output power connection
wirings must not to be accessible to the nal user.
6
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
!

EMC lter shall be mounted on AC MAINS power sup-
ply wiring. Powersoft suggest the Schaffner FN2030-10-06
model.
5.3 Fire and liquids
Do not spill water or other liquids into or on the unit.
No naked ame sources such like lighted candles should
be placed on the module.
The enclusure apparatus shall be designed so that the start and
spread of re is prevented as much as possible , and shall not give
rise to danger of re to the surrounding of the apparatus. This is
achieved as follows:
fby using good engineering practice in design and production
of the enclosure apparatus to avoid potential ignition sources;
fby using materials of low ammability for internal parts in the
vicinity of potential ignition sources;
fby using re enclosures to limit the spread of re.
6 Thermal constrains
This device must be correctly heatsinked for proper and
reliable operation.
Cooling of the DigiMod 3004PFC4 is achieved by means of the
built-in fans cooler which shall be improved by assembling to the
module’s chassy a proper external passive heat sink.
The two built-in fans cooler (80x80 mm, 24 Vdc) and an
appropriate external heat sink guarantee by design thermal
efciency and reliability up to 50°C enviromental temperature
with 6 dB power crest factor program operation, both channels
driven on 4 � load.
Proper heatsink planarity is strongly suggested to allow thermal
transfer from the bottom plate to the heat sink; thermal compound
is recommended.
In case of installation inside of loudspeaker enclosure, proper
spacing of at least 100 mm is necessary between the frame of the
unit and side components or surfaces of the enclosure.
The module has been designed to t into a loudspeaker cabinet:
please refer to FIGURE 1 for proper module placing.
IN FIGURE 1 HEATSINK FINS ARE SET HORIZONTALLY
(WRONG!) ONLY FOR DESCRIPTIVE PURPOSE.
All conguration showed in FIGURE 1 are viable for proper
module placing and cooling.
In FIGURE 1.a the module and the loudspeakers share the same
chamber into the cabinet. This is the dafault placement solution: it
allows good ventilation because of woofer diaphragm movement
and high air volume; be aware of magnetic eld interaction: place
the module far enough from loudspeakers magnet in order to
prevent fans blockage.
In FIGURE 1.b the module is placed in a separate chamber:
we suggest to cut holes in front of the fans and on the top and
bottom surfaces of the chamber. Thanks to the holes, the two fans
take fresh air from the loudspeakers volume and blow it inside the
module; the warm air ows outside the module’s chamber helped
by the chimney effect.
FIGURE 1.c shows the more efcient cooling conguration, but
is less effective against dust and moisture that can get into the
module and damage it. By allowing external air ow, it is possible
to reduce the ns width on the heat sink by maintaining good
cooling performances.
100 mm
3.94 inch
Be aware of
magnetic leakage
MIN.
Do not obstruct
air ow
Be aware of
air leakage
FIGURE 1: Module cooling solutions (for descriptive purpose heatsink
ns are set in wrong direction); a) Module and loudspeaker into the
same chamber; b) Module in a separate sealed chamber;
c) Module in a separate vented chamber.
7
a
b
c

7 Mechanical Drawing
78.6
Ø 4.2 THROUGH HOLE
N°5 POS.
283.3
13.1
38.923.9
104.349.830.149.8
81.1
M3 THREADED
HOLE
N°14 POS.
300.5
54.2
108.4
29.2 9.7
122
308.5
FIGURE 2: DigiMod 3004PFC4 mechanical drawing.
All dimensions in millimeters.
8

8 Main connections
GROUND
AC MAINS
Channel 1
Channel 3Channel 4
Channel 2
Faston
6.3 x 0.8 mm
Faston
6.3 x 0.8 mm
Channel 3Channel 4
Faston
6.3 x 0.8 mm
Channel 1Channel 2
Bridge 3-4
Bridge 3-4
Bridge 1-2
Faston
6.3 x 0.8 mm
Bridge 1-2
Faston
6.3 x 0.8 mm
GROUND
AC MAINS
Channel 1
Channel 3Channel 4
Channel 2
Faston
6.3 x 0.8 mm
Faston
6.3 x 0.8 mm
Channel 3Channel 4
Faston
6.3 x 0.8 mm
Channel 1Channel 2
Bridge 3-4
Bridge 3-4
Bridge 1-2
Faston
6.3 x 0.8 mm
Bridge 1-2
Faston
6.3 x 0.8 mm
GROUND
AC MAINS
Channel 1
Channel 3Channel 4
Channel 2
Faston
6.3 x 0.8 mm
Faston
6.3 x 0.8 mm
Channel 3Channel 4
Faston
6.3 x 0.8 mm
Channel 1Channel 2
Bridge 3-4
Bridge 3-4
Bridge 1-2
Faston
6.3 x 0.8 mm
Bridge 1-2
Faston
6.3 x 0.8 mm
GROUND
AC MAINS
Channel 1
Channel 3Channel 4
Channel 2
Faston
6.3 x 0.8 mm
Faston
6.3 x 0.8 mm
Channel 3Channel 4
Faston
6.3 x 0.8 mm
Channel 1Channel 2
Bridge 3-4
Bridge 3-4
Bridge 1-2
Faston
6.3 x 0.8 mm
Bridge 1-2
Faston
6.3 x 0.8 mm
FIGURE 3: DigiMod 3004PFC4 – AC MAINS and audio output wiring:
a. Four ways – four single channels;
b. Three ways – channels 3-4 in bridge mode;
c. Three ways – channels 1-2 in bridge mode;
d. Two ways – channels 1-2 and 3-4 in bridge mode.
9
ba
c
d

9 Main connectors pinout
The following image and tables show the pinout of main
input and output connectors PL1000, PL2000, PL3000, PL4000,
PL1003, PL3003 and the SIMM board.
FIGURE 6 shows the default jumpers conguratin for the
Bypass connectors. By means of these jumpers it is possible to
change the main gain and enable the DSP and external circuits.
Gain at +38dB is intended for low level inputs which need
more boost, such as consumer devices; take care on raising the
gain since this involves more noise at output stages.
DSP and external circuits – such as lters or volume
regulators – can be independently activated by removing related
jumpers on PL1000 for channel 1, PL2000 for channel 2, PL3000
for channel 3 and PL4000 for channel 4 (see paragraphs 9.4, 9.5,
9.6 and 9.7 for the pinout description). Both DSP and external
circuits can be layed on a 72-pin SIMM board which would be
plugged into the SO5 Socket; for more informations about SIMM
specications, please contact Powersoft. SIMM board pinout is
shown on FIGURE 8.
9.1 Bill of connectors
CODE NAME TYPE
SO5 DSP/external circuit board
socket 72-pin SIMM Socket
PL1003 Input connector channels
1 & 2 IDC at cable 34 ways
PL3003 Input connector channels
3 & 4 IDC at cable 34 ways
PL2 Test Connector (reserved) IDC at cable 20 ways
PL1001 Signal OUT 1 + Faston 6.3x0.8 mm Male
PL1002 Signal OUT 1 –
(GND) Faston 6.3x0.8 mm Male
PL2001 Signal OUT 2 – Faston 6.3x0.8 mm Male
PL2002 Signal OUT 2 +
(GND) Faston 6.3x0.8 mm Male
PL3001 Signal OUT 3 + Faston 6.3x0.8 mm Male
PL3002 Signal OUT 3 –
(GND) Faston 6.3x0.8 mm Male
PL4001 Signal OUT 4 – Faston 6.3x0.8 mm Male
PL4002 Signal OUT 4 +
(GND) Faston 6.3x0.8 mm Male
PL1000 Bypass Channel 1
PL2000 Bypass Channel 2
PL3000 Bypass Channel 3
PL4000 Bypass Channel 4
PL1 reserved Molex 22-27-2031
PL7 FAN Molex 22-27-2031
PL22 FAN Molex 22-27-2031
PL23 FAN Molex 22-27-2031
PL24 FAN Molex 22-27-2031
PL25 Test Connector (reserved) Molex 22-27-2031
Channel 1
GND
HOT
COLD
Channel 3
GND
HOT
COLD
Channel 2
GND
COLD
HOT
Channel 4
GND
COLD
HOT
Parallel 1&2
GND
HOT
COLD
Parallel 3&4
GND
HOT
COLD
FIGURE 4: DigiMod 3004PFC4 – four input channels wiring.
Channel 1
GND
HOT
COLD
Channel 3
GND
HOT
COLD
Channel 2
GND
COLD
HOT
Channel 4
GND
COLD
HOT
Parallel 1&2
GND
HOT
COLD
Parallel 3&4
GND
HOT
COLD
FIGURE 5: DigiMod 3004PFC4 – parallel input wiring.
PIN 1
Jumpered
Not jumpered
PL1003
PL3003
PL1000
(Channel 1)
(Channel 3)
(Channel 4)
(Channel 2)
PL2000
PL3000
PL4000
Place jumper to
switch gain to 38 dB
Remove jumper
to enable DSP
Remove jumper to
insert external circuit
FIGURE 6: DigiMod 3004PFC4 bypass connectors pinout
10

FIGURE 7: DigiMod 3004PFC4 surface components layout.
11

9.2 PL1003 pinout
PIN# Name IN OUT POWER Range Scale
factor
Imped-
ance Protected Tolle-
rance Description
1SDPWS lActive High,
Logic input 3.3 to 12 Vdc 1 k� Logic input
to be fed by
“OR” diode Power Supply Shut Down
2RESERVED
3RESERVED
4RESERVED
5GND lGround
6 IN 1 + l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 1
Positive Balanced Input
32 dB
Input To Output Overall
Gain
7 IN 1 – l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 1
Negative Balanced Input
32 dB
Input To Output Overall
Gain
8GND lGround
9VOUT1MON l20 V/V4.5 k� Channel 1
Output Voltage Monitor
10 PROTECT1 l
Level 1
(2 to 10) = not in
Protection
Level 0 (0 to 1) =
Protection
1 0 0 k � Channel 1 Output Stage Protection
Monitor
11 IOUT1MON l7. 5 A/V4.5 k� Channel 1
Output Current Monitor
12 TEMPMON12 l0 – 5 V See
table 7 k� NTC sensor tap output
13 +12VDCOUT l+12 Vdc; 0.5 A max output
current available Polyswitch ±5% Positive regulated analog
section supply
(same as pin 22)
14 -12VDCOUT l–12 Vdc; 0.5 A max output
current available Polyswitch ±5% Negative regulated analog
section supply
(same as pin 21)
15 MUTE l
Active Low,
To be pulled to GND by
current sink of at least
20 mA
CH1 and CH2
Output Stage Mute
(disable output stages PWM)
16 +VCCMON l+7.5 Vdc 4.5 k� Rail Bus Positive Monitor
17 -VCCMON l–7.5 Vdc 4.5 k� Rail Bus Negative Monitor
12
Table continues on the next page...

PIN# Name IN OUT POWER Range Scale
factor
Imped-
ance Protected Tolle-
rance Description
18 -VCCMON l–7.5 Vdc 4.5 k� Rail Bus Positive Monitor
19 +VCCMON l+7.5 Vd4.5 k� Rail Bus Negative Monitor
20 MUTE l
Active Low,
To be pulled to GND by
current sink of at least
20 mA
CH1 and CH2
Output Stage Mute
(disable output stages PWM)
21 -12VDCOUT l–12 Vdc; 0.5 A max output
current available Polyswitch ±5% Negative regulated analog
section supply
(same as pin 21)
22 +12VDCOUT l+12 Vdc; 0.5 A max output
current available Polyswitch ±5% Positive regulated analog
section supply
(same as pin 22)
23 TEMPMON12 l0 – 5 V See
table 7 k� NTC sensor tap output
24 IOUT2MON l7. 5 A/V4.5 k� Channel 2
Output Current Monitor
25 PROTECT2 l
Level 1
(2 to 10) = not in
Protection
Level 0 (0 to 1) =
Protection
1 0 0 k � Channel 2 Output Stage Protection
Monitor
26 VOUT2MON l20 V/V4.5 k� Channel 2
Output Voltage Monitor
27 GND lGround
28 IN 2 – l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 2
Negative Balanced Input
32 dB
Input To Output Overall
Gain
29 IN 2 + l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 2
Positive Balanced Input
32 dB
Input To Output Overall
Gain
30 GND lGround
31 RESERVED
32 RESERVED
33 RESERVED
34 SDPWS lActive High,
Logic input 3.3 to 12 Vdc 1 k� Logic input
to be fed by
“OR” diode Power Supply Shut Down
13
...continued from previous page.

9.3 PL3003 pinout
PIN# Name IN OUT POWER Range Scale
factor
Imped-
ance Protected Tolle-
rance Description
1SDPWS lActive High,
Logic input 3.3 to 12 Vdc 1 k� Logic input
to be fed by
“OR” diode Power Supply Shut Down
2RESERVED
3RESERVED
4RESERVED
5GND lGround
6 IN 3 + l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 3
Positive Balanced Input
32 dB
Input To Output Overall
Gain
7 IN 3 – l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 3
Negative Balanced Input
32 dB
Input To Output Overall
Gain
8GND lGround
9VOUT3MON l20 V/V4.5 k� Channel 3
Output Voltage Monitor
10 PROTECT3 l
Level 1
(2 to 10) = not in
Protection
Level 0 (0 to 1) =
Protection
1 0 0 k � Channel 3 Output Stage Protection
Monitor
11 IOUT1MON l7. 5 A/V4.5 k� Channel 3
Output Current Monitor
12 TEMPMON34 l0 – 5 V See
table 7 k� NTC sensor tap output
13 +12VDCOUT l+12 Vdc; 0.5 A max output
current available Polyswitch ±5% Positive regulated analog
section supply
(same as pin 22)
14 -12VDCOUT l–12 Vdc; 0.5 A max output
current available Polyswitch ±5% Negative regulated analog
section supply
(same as pin 21)
15 MUTE l
Active Low,
To be pulled to GND by
current sink of at least
20 mA
CH3 and CH4
Output Stage Mute
(disable output stages PWM)
16 +VCCMON l+7.5 Vdc 4.5 k� Rail Bus Positive Monitor
17 -VCCMON l–7.5 Vdc 4.5 k� Rail Bus Negative Monitor
14
Table continues on the next page...

PIN# Name IN OUT POWER Range Scale
factor
Imped-
ance Protected Tolle-
rance Description
18 -VCCMON l–7.5 Vdc 4.5 k� Rail Bus Positive Monitor
19 +VCCMON l+7.5 Vd4.5 k� Rail Bus Negative Monitor
20 MUTE l
Active Low,
To be pulled to GND by
current sink of at least
20 mA
CH3 and CH4
Output Stage Mute
(disable output stages PWM)
21 -12VDCOUT l–12 Vdc; 0.5 A max output
current available Polyswitch ±5% Negative regulated analog
section supply
(same as pin 21)
22 +12VDCOUT l+12 Vdc; 0.5 A max output
current available Polyswitch ±5% Positive regulated analog
section supply
(same as pin 22)
23 TEMPMON34 l0 – 5 V See
table 7 k� NTC sensor tap output
24 IOUT2MON l7. 5 A/V4.5 k� Channel 4
Output Current Monitor
25 PROTECT4 l
Level 1
(2 to 10) = not in
Protection
Level 0 (0 to 1) =
Protection
1 0 0 k � Channel 4 Output Stage Protection
Monitor
26 VOUT4MON l20 V/V4.5 k� Channel 4
Output Voltage Monitor
27 GND lGround
28 IN 4 – l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 4
Negative Balanced Input
32 dB
Input To Output Overall
Gain
29 IN 4 + l
Unbalanced
1.92 Vrms for Full Output;
7 Vrms Absolute Max Input
Balanced
0.96 Vrms for Full Output;
3.5 Vrms Absolute Max Input
10 k�
Channel 4
Positive Balanced Input
32 dB
Input To Output Overall
Gain
30 GND lGround
31 RESERVED
32 RESERVED
33 RESERVED
34 SDPWS lActive High,
Logic input 3.3 to 12 Vdc 1 k� Logic input
to be fed by
“OR” diode Power Supply Shut Down
15
...continued from previous page.

9.4 PL1000 Pinout
Pin# Name IN OUT Impedance Description
1BY31 l2.7 k� + 47 � Channle 1
Unbalanced Intput
2-3 BY41 l
32dB gain
2.7 k� + 47�
38dB gain
5.4 k� + 47 �
Channle 1
Unbalanced Output
4-5 BY21 lChannle 1
Unbalanced Input
6BY11 l47 � Channle 1
Unbalanced Output
9.5 PL2000 Pinout
Pin# Name IN OUT Impedance Description
1BY12 l47 � Channle 2
Unbalanced Output
2-3 BY22 lChannle 2
Unbalanced Input
4-5 BY42 l
32dB gain
2.7 k� + 47�
38dB gain
5.4 k� + 47 �
Channle 2
Unbalanced Output
6BY32 l2.7 k� + 47 � Channle 2
Unbalanced Input
9.6 PL3000 Pinout
Pin# Name IN OUT Impedance Description
1BY31 l2.7 k� + 47 � Channle 3
Unbalanced Intput
2-3 BY41 l
32dB gain
2.7 k� + 47�
38dB gain
5.4 k� + 47 �
Channle 3
Unbalanced Output
4-5 BY21 lChannle 3
Unbalanced Input
6BY11 l47 � Channle 3
Unbalanced Output
9.7 PL4000 Pinout
Pin# Name IN OUT Impedance Description
1BY12 l47 � Channle 4
Unbalanced Output
2-3 BY22 lChannle 4
Unbalanced Input
4-5 BY42 l
32dB gain
2.7 k� + 47�
38dB gain
5.4 k� + 47 �
Channle 4
Unbalanced Output
6BY32 l2.7 k� + 47 � Channle 4
Unbalanced Input
106.10
112.33
105.30
2.19 4.04
38.99
72 OUT 2– 71 GND 70 GND 69 IN 2 + 68 IN 2 – 67 BY 12 66 BY 22 65 BY 42 64 EARECT2 63 IOUT2MON 62 PROTECT2 61 60 59 58 MUTE 57 56 55 54 53 52 RESERVED 51 GND 50 49 48 47 46 OUT 4– 45 TEMPMON 44 GND 43 +VCCMON 42 SYNC CH 41 –VCCMON 40 GND 39 –12VDCOUT 38 +12VDCOUT 37 +5VDC 04 IN 1+ 03 GND 02 GND 01 OUT 1+ 36 +5VDC 35 +12VDCOUT 34 –12VDCOUT 33 GND 32 –VCCMON 31 GND 30 +VCCMON 29 GND 28 TEMPMON 27 26 OUT 3+ 25 BY23 24 23 BY24 22 GND 21 RESERVED 20 RESERVED 19 RESERVED 18 RESERVED 17 16 15 RESERVED 14 RESERVED 13 RESERVED 12 RESERVED 11 PROTECT1 10 IOUT1MON 09 EARECT1 08 BY41 07 BY21 06 BY11 05 IN 1–
FIGURE 8: 72-pin SIMM board pinout; dimensions in millimiters.
16

supply’s voltage rails. This would result in an inefcient use of the
power supply’s energy.
Please pay special attention in using balanced inputs on all
measurement equipment (such as oscilloscope probes) when you
are bench testing.
10 Audio path block diagram
11 Internal Signal Path Polarity
In order to increase the power’s supply energy storage
efciency, signals coming from channel pairs 1-2 and 3-4 are
polarity reversed, one with respect to the other within the pair,
when entering the amplier. This ensures a symmetrical use of the
voltage rails: if, for example, both channels’ 1 and 2 input signals
are going through a peak at the same time, channel 1’s energy
will come from the positive voltage rails while channel 2, whose
polarity is reversed with respect to channel 1, will be fed energy
from the negative voltage rails. In this manner, the power supply
will work symmetrically, with one channel catered by the positive
rails and the other by the symmetrical negative rails. Channel 2’s
signal will be polarity reversed once more to ensure that both
channels output with the same polarity as their corresponding
input signals.
For this reason it is very important not to invert the polarity
of either channels before feeding them to the module. A double
polarity inversion (the rst by the user inserting the input signal
and the other by the amplier’s internal circuitry) results in no
inversion at all. If this were the case, both channels would be
weighing on only one side (positive or negative) of the power
470p
470p
IN 1 +
IN 1 –
IN 1 +
IN 1 –
+VCC
-VCC
D S
G
D S
G
OUT 1 +
GATE2
GATE1
470p
47 Ohm
470p
47 Ohm
47 Ohm
47 Ohm
IN 2 +
IN 2 –
IN 2 +
IN 2 –
+VCC
-VCC
D S
G
D S
G
OUT 2 –
GATE4
GATE3
PWMCH2 PWMCH1
CONTROL BOARD
BY11
BY21
BY31 1
2
3
4
5
6
2K7
JR2
JR1
BY41
BY12
BY22
BY32
2K7
1
2
3
4
5
6
JR4
JR3
BY42
10K
10K
47 Ohm
2.7k
47 Ohm
10K
10K
47 Ohm
47 Ohm
2.7k
FIGURE 9: Audio path block diagram for channel 1 & 2 on Control Board 1.
Channels 3 & 4 are managed by the Control Board 2 in the same way.
first polarity
inversion
second polarity
inversion
Channel 1
input
Channel 2
input
Channel 1
output
Amp
Channel 2
output
FIGURE 10: Internal signal path polarity with example input signals.
Both channels 1 and 2 are fed the same sine signal.
17

12 Protections
Fault protections are systems designed to protect people from
severe or fatal electric shocks and avoid severe damages on the
amplier or the loudspeakers in case of electrical parameters out
of scaling or critical changes in environmental conditions.
The architecture of Powersoft’s ampliers encompass
several protection mechanisms triggered by harmful signal and
temperature. Protection systems and triggers are independently
implemented in the power supply section (power supply
protection) and the amplier section (amplier protections) in
order to minimize system damages and maximize efciency.
12.1 Power supply protections
Power supply protections aim to isolate a faulty section in
electrical power system from the rest of the device in order to
prevent the propagation of the fault and limit device damages.
12.1.1 Primary AC mains overcurrent protection
AC main overcurrent are ltered by a 10 A time-lag fuse (also
known as time-delay or low blow-fuse). The purpose of the time
lag fuse is to allow the supply in electricity for a short time before
the fuse actually blows. If the time-lag fuse blows out the amplier
switch off; replace the fuse with a proper 10 A time-lag fuse in
order to restore the full functionality of the amplier.
12.1.2 Primary AC mains overvoltage protection
AC mains overvoltage threshold is set to 295 Vrms. If the AC
mains voltage exceeds 295 Vrms the power supply stop working;
the device does not turn completely off but falls in a “sleeping”
mode: the power supply turns on again when the AC mains
voltage drops under 290 Vrms.
AC mains overvoltage are well tolerated by the power supply:
non damages can be caused to the system even in case of severe
overvoltage up to 385 Vrms.
12.1.3 Primary thermal protection
The temperature is detected at power supply’s Q6 and Q7
MOSFETs located on the Main Board bottom surface.
The working temperature of the power supply triggers the
heat dissipated by the device: if the temperature rises exceeding
components tolerances, the primary hardware thermal protection
starts lowering the rails voltage in order to lower the heat wasted
and keep the overall efciency high.
The process is auto-adaptive and aims to maintain the system
up even in heavy thermal condition. If the rails voltage drops
down to ±33 V the Main Board microcontroller shut down the
amplier section (i.e. shut down the Control Board), the power
supply still running. This may happen rarely in harsh conditions:
the amplier does not switch off but neither signal processing nor
fan cooling are active. In these conditions, while the temperature
slowly decreases, the rails voltage rises: when the rails voltage
reaches ±33V, the ampliers section switch on again. If cooling is
not effective, the system may start oscillate.
12.2 Amplier protections
The amplier section protections are managed by the Control
Board and the Main Board in tandem.
Amplier protections are triggered by audio signal current and
voltage – by comparing input and output – and NTC, negative
temperature coefcient, thermistors. NTC thermistors provide
thermal feedback to the Control Board, to the Main Board and
possibly to the DSP Board.
NTC resistance decreases with increasing temperature: the
table below displays the relationship between temperature and
voltage drop across NTC thermistors. NTC’s voltage drop for
each channel are routed to the respective TEMPMON contacts
on the SO5 socket.
Since the temperature is detected on the PCB surface it does
not represent the actual module temperature: be aware that
some parts of the amplier may be at higher temperature.
T (°C) V
-40 4.82
-35 4.76
-30 4.69
-25 4.6
-20 4.5
-15 4.37
-10 4.22
-5 4.05
03.86
53.66
10 3.43
15 3.2
20 2.96
25 2.71
30 2.47
35 2.24
40 2.02
45 1.82
50 1.63
55 1.46
T (°C) V
60 1.3
65 1.16
70 1.04
75 0.93
80 0.83
85 0.75
90 0.67
95 0.61
100 0.55
105 0.5
110 0.46
115 0.42
120 0.38
125 0.35
130 0.33
135 0.31
140 0.29
145 0.27
150 0.25
12.2.1 Secondary thermal protection
Microcontrollers on the Main Board and on the Control Board
manage fans rotation depending on the mean temperature of the
module sensed by the NTC thermistors.
18

The Main Board and the Control Board microcontrollers work
in parallel by triggering fan speed rotation and output power
modulation at different temperature threshold. The Main Board’s
circuitry implements a fan speed control that operates at lower
temperature with respect to Control Board fan management;
Main Board actions have priority on Control Board actions.
In heavy thermal conditions the system reduces the available
power drawn by the ampliers section by means of a reduction
of the output current: this lower the heat dissipation and improve
cooling, but reduces the signal output level. In parallel to the
power drop operated by the Control Board microcontroller, the
Main Board microcontroller reduces the rails tension to ±70V.
The table below shows the temperature thresholds that trigger
the microcontrollers and the actions operated accordingly.
12.3 Harmful signal protections
Bad signals can cause amplier and loudspeakers damages. In
order to limit damages, harmful signal triggers specic protections.
12.3.1 Output short circuit
If the load impedance is too low or the loudspeaker line has a
short circuit (because of voice coil damages, wires short circuit,
improper wiring, etc), the amplier output current rises to harmful
values.
When the output current reaches 54 Apeak (38 A
rms) the
Control Board microcontroller shut down the amplier section,
the power supply still working. After 2 seconds the Control Board
microcontroller switches on the amplier section: if the short
circuit still persists, the current rises and the amplier is switched
off again. The microcontroller toggles the ampliers on and off
every 2 seconds until the short circuit is removed.
12.3.2 High frequency stationary loud signals
High frequency stationary signals, like steady sinusoid signals –
improperly referred as continuous signals – with high amplitude
tend to stress the amplier section of the module as well as the
loudspeakers voice coils.
TEMPMON (V) T (°C) Main Board Fan Main Board Power Control Board Fan Control Board Power
VT> 2.02 Tmean < 40 OFF Wmax OFF Wmax
1.63 < VT< 2.02 40 < Tmean < 50 ON SLOW Wmax OFF Wmax
1.30 < VT< 1.63 50 < Tmean < 60 ON FAST Wmax OFF Wmax
1.04 < VT< 1.30 60 < Tmean < 70 ON FAST Wmax ON FAST Wmax
0.9 < VT< 1.06 70 < Tmean < 75 ON FAST Vrails = ±70 V ON FAST 1/2 Wmax
0.69 < VT< 0.9 75 < Tmean < 90 ON FAST Vrails = ±70 V ON FAST 1/10 Wmax
VT< 0.69 Tmean > 90 ON FAST Vrails = ±70 V Ampliers shut down
When a high frequency stationary loud signals is feed into the
amplier the Control Board limits its mean current depending on
its level and frequency. The process is auto adaptive and frequency
driven: at higher frequency the limiter acts faster.
The system limits output current of loud signals in the band
10 kHz – 20 kHz with output amplitude higher than 95 Vrms; above
20 kHz the protection operates when the output amplitude
exceeds 48 Vrms.
12.4 Auxiliary power protections
Auxiliary plugs are protected against short circuit: a poliswitch
opens the auxiliary circuits when the current drawn exceeds 2.2A.
12.5 Control Board protection LEDs
The Control Board is equipped with a protection LED per
channel (see LED chart). The protection LED lights when one of
the following protection systems turns on:
fOutput short circuit;
fThermal protection;
fRails undervoltage.
D200 D100D5 D102D202 D3 D4
FIGURE 11: Control Board LEDs.
19

13 LED chart
Both the Main Board and the Control Board are equiped with status LED and protection LED; refer to FIGURE 11 and FIGURE 12 for
LED localization and the following table for LED description.
13.1 Control Board LED chart
LED ID Type Description Idle mode Signal mode
D3 status Auxiliary +12 V active ON ON
D4 status Auxiliary +5 V active ON ON
D5 status Auxiliary –12 V active ON ON
D102 protection Control Board protection engaged on CH 1 NORMALLY OFF NORMALLY OFF
D202 protection Control Board protection engaged on CH 2 NORMALLY OFF NORMALLY OFF
D100 status Current calibration / current drawn by CH 1 NORMALLY OFF BLINK
D200 status Current calibration / current drawn by CH 2 NORMALLY OFF BLINK
13.2 Main Board LED chart
LED ID Type Description Idle mode Signal mode
D6 status rails +Vcc ON ON
D8 status rails –Vcc ON ON
D37 protection Main Board secondary protection engaged NORMALLY OFF NORMALLY OFF
D39 status Mute ON when MUTE ON ON when MUTE ON
D20 protection Main Board primary protection engaged NORMALLY OFF NORMALLY OFF
D6 D8 D20D37, D39
FIGURE 12: Main Board LEDs.
20