1 - What might be the consequences in terms of limiter settings, if a manufacturer were to establish an input/output gain, selecting a DigiMod 38 dB with the 32 dB jumper in place? How do they work the scale factors for DSP-4?

When you choose a wrong amp model as connected (so, for example, DigiMod 1000 rather DigiMod 2000HV) the different scale factors provide a wrong meters measurements and a wrong limiters behavior.

These scale factors are: current scale factor for the current reading, voltage scale factor for the voltage reading, output scale factor to obtain a gain consistent with the amplifier gain response, temperature scale factor for the temperature reading and finally, “output capacitor value”””” for the improving of the current reading (in some amplifiers, there is an output capacitor that makes difficult the current reading, so setting this scale factor we can give a virtual capacitor that removes the capacitor value that pollutes the reading)

The last setting regards the “active channel”. This one is used to make compatible the IpalMod and M-Drive with DSP-4, because they have only one output channel, without this selection the DSP-4 “sees” the IpalMod and M-Drive always in protection state.

In this case, if you select DigiMod 3004 38dB for a DigiMod 3004 32dB (really connected), the only difference will be the gain response: DSP-4 applies +6dB in input to the amplifier and so with a sine signal @ 1Vrms in input, the voltage and current response will be different than uses a right gain setting selected. Anyway, the limiter should work well because the other scale factors are the same for both type of amp module, so it will be like increasing the DSP-4 input sensitivity.

2 - Can you indicate me how many 3004PFC4 amplifiers can be connected in daisy chain through PowerCON?

Using Line @ 16A

N° 4 @ 230V

N° 2 @ 115V


Using Line @ 32A

N° 8 @ 230V

N° 4 @ 115V


3 - How can i download the ProManager licence for the access?

You can download your licence directly from the “OEM Manufacturer Registration” page.


  1.  Go to the OEM Manufacturer Registration page following this link http://armoniaproman.powersoft.it/
  2. Login using your account and password
  3. You’ll see your data and, if the Powersoft staff has confirmed your registration, it will be possible to download your licence. So, click the button in order to start the download.
  4. Since you have got the licence, copy it in the folder that you can find following this path C:\Powersfot\Armonía ProManager\Settings\Licence   
  5. Try again to open ProManager, it should open without any request.


4 - I would like to place the IN interface for DSP-D in another side than our own heat-sink, created on purpose. What are the Pin-Outs from the Input interface > Ribbon > DSP-D?

From input interface come two flat cable, one of these is splitted in two different micro-match connectors. So here below you find the correspondence between the DIL connectors on the input interface and the Micro-Match connectors on the DSP-D.

CN1000 DIL Connector (on inptu interface) -> CN2 MicroMatch connector (on DSP-D)

CN1004 DIL Connector (on input interface) -> CN3 (pin 1 – 12) + CN1 (pin 13 – 26) MicroMatch connector (on DSP-D)

5 - How can I modify the D-Cell504 flat cable in order to connect two XLR connectors for each channel?

Following the schematic you can do what you need. Anyway is strictly recommended to use this kind of cable only for the amp evaluation.


6 - We used 32bit OS and therefore the 32bit Sigma Studio. I've changed my operating system to 64bit and the 64bit Sigma Studio software works, but it can't read the "old" 32bit setups. Why isn't it possible?

The preset templates that you build with a x86 release of SigmaStudio, are not compatible with X64 release because the instructions set is different. We recommend using one system dedicated to the programming with 32bit O.S., stable and functioning. You don’t need a powerful PC for the DSP programming, for example with the last O.S. or with the best processor, but is important that you have a system that never stops.


7 - How can I balance the DSP outputs ch3-ch4?

Following the schematic, it’ possible to do a balancing circuit using one NE5532D for each output channel. If you would like to manage the outputs independently, you could add a potentiometer before the 10Kohm resistor. Following this circuit, we'll have a good balancing with low distortion level (not measurable) and the best S/N ratio.


8 - Is there a way to monitor the load impedance connected on DigiMod?

 The only way to monitor the load impedance on DigiMod is using Armonìa Software, you will need of a converter UART/RS485 called ProNet485 that allows doing the remote managing.


9 - D-Cell504 has the Load Impedance Measurable that would give the possibility of monitoring each separate channel. Is this feature applicable in Bridge Mode also? If yes, which are the connector pins to use?

There aren't pins that allow the load impedance monitoring for the speakers connected in bridge mode, but you can get the singles values for each channel and summing these it will obtain a single one, doing so you will get the load impedance in bridge mode.

10 - Is DSP mounted in a DigiMod IS different by the DSP provided in the D-Cell504 DSP IS? Is it possible to exchange them?

The DSP-C and DSP-D are external boards mounted on DigiMod IS or provided with the integration kit, in the D-Cell504 DSP, this one resides within. You can't use the DSP-C/DSP-D even for D-Cell.


11 - What do they mean the led on control-board plus of DigiMod Series?

Left side / right side: there are two yellow LEDs indicate the signal presence.

Top center (going from left to right): there are 5 leds indicate respectively:

  • Protection: Led is lit becoming red when the protection is activated in the output 1 (for example when the output is in short circuit)
  • The presence of +5, this is a green led, it’s normally lit when the module is on.
  • The presence of +12, this is a green led, it’s normally lit when the module is on
  • The presence of -12, this is a green led, it’s normally lit when the module is on.
  • Protection: Led is lit becoming red when the protection is activated in the output 2

12 - Can I put in parallel both outputs of the D-Cell504 without problems in order to rise lower minimum loudspeaker impedance to 2 Ohms? Since the user manual stated that the absolute DC output offset is

This is a not recommended practice that increases the damage risk. The two output channels of amp module are not equal perfectly (one is inverted respect the other) and the signal in output, even if the input signal is the same for each amp module, will be processed differently. In our amps modules the minimum load impedance is always 4ohm and not is possibile to have a lower load impedance.


13 - What do they mean the led on mainboard of DigiMod 3000 PFC?

 Top-left side: there are three green LEDs (except the one in the middle, that is yellow). They indicate respectively (from left to right):

  1. The presence of +18, this led is normally lit when the module is on.
  2.  If the Energy Save mode is on, this led is normally lit when the module is on (Energy Save is enabled as default).
  3. The presence of +VCC

These leds must be normally lit when the module is on.

Top-right side: there are three green LEDs indicate respectively (from left to right):

  1. The presence of -VCC,
  2. The presence of +7VDC
  3. The presence of -18

These leds must be normally lit when the module is on.

Bottom left side: there is one yellow LED that is lit when the fan is activated

14 - In D-Cell504 4ch module the fan in the center doesn’t work even if board is hot, is that normal?

Yes, it’s a normal behavior because the fan starts to run when the module temperature is approximately 60°. It’s strange only if the module exceeds this value and the fan doesn’t start. Anyway, the module goes in thermal protection when the temperature value exceeds approximately 75° reducing the signal output.

15 - How can I set the DigiMod in order to use it @ 110V?

See the picture and follow these steps:

  • Insert the jumper in the phoenix 2 poles connector called F1 (that is in the right side of the amplifier).
  • Connect the mains (120v) in the phoenix connector CN1 (in the left side of the amplifier) 



16 - I would like to replace the DigiMod’s fan, what is its NPN?

DigiMod mounts an ADDA fan with wiring included, manufactured by our supplier. You can buy the fan only without wiring and so connect the molex following the pin-out like the original fan.

Search NPN : AD0824UB-D90(T)

17 - Regarding DigiMod 3000 PFC, What is the current consumption for the 2 units working together?

- 7,6A @ 115V

- 4A @ 130V

- 4A @ 230V 



18 - I have an amp module set at 230Vac. As soon as I turn it, supplying 230Vac, the fan starts to run for few seconds. If I leave the amp module, set at 230Vac supplying it with 125Vac, the fan starts to run at low speed, without stop itself. Is there an expl

When DigiMod is turned on, fan starts to run for few seconds, then the fan will start to run again only after that the limit threshold temperature will be exceeded and so the fan will provide to cool the amplifier. When you supply 230Vac in a DigiMod set at 230Vac, the fan's behavior is normal as described in the question. Instead, if you supply 125Vac in DigiMod set at 230Vac, the module's power supply tries to start all process, but the voltage is lower than those needed. In this case, the microprocessor attempts to start himself (so does run the fan), then due to the absorption caused by the starting attempt, DigiMod reaches the voltage value that triggers the protection called "undervoltage". This behavior becomes a sort of loop because the amp module attempts to start working but it fails, so it tries again and again. For this reason, the fan seems to move constantly, but this is due to its mechanical inertia.


19 - How should I connect the signal input to D-Cell504, without input interface, if I would like to use it in Mono input configuration?

If you use D-Cell504 in Mono Input configuration, you must connect the input to the channel 1 and channel 2 in parallel following this instructions:

1)     Connect the input signal to the input channel 2 in CN1 connector:

                  - IN2- to PIN4

                  - IN2+ to PIN5

                  - GND to PIN6


2)     Connect the input channel 2 in parallel with the input channel 1 in the same CN1 connector:

                - PIN5 to PIN22

                - PIN4 to PIN23

                - PIN6 to PIN21


BY1 in/out and BY2 in/out are the pins of input and output to connect an external potentiometer to control input channel or even to add something like analog HP Filter or pad attenuator. If you don’t want to add any kind of processing in input, please connect together these pins:

                -PIN7 to PIN8

                -PIN19 to PIN20

20 - How should I connect the micro-match connectors from the input interface to the DSP-D/C board?

The pictures here below, explain how to connect the micro-match connectors. You can take as reference the type of socket to decide how to pose the micro-match: one flat cable has two micro-match connectors for a total of 26 poles, the other one has only a 20 poles micro-match connector. Please make attention to the red wire in the flat cables, this is used to define what is the first pin.

21 - What is the difference between Lite and Pro Programming Board?

Lite Programming board allows you to store one preset at time with SigmaStudio connected by USB port. It’s needed to have a “link compile download” command and then press the store button to save the preset just compiled, in the preset slot selected by the amp module input interface.


Pro Programming board has been thought for the mass-production, in facts it allows you to store an entire bundle of 4 presets, obtained from a sort of “master loudspeaker”. As the Lite Programming Board, the Pro type allows you to store one preset at a time in the DSP of the loudspeaker that we'll consider as the “master”; always using the PC to have a “link compile download” command by SigmaStudio. In addition than the capabilities in common with Lite Programming Board, the Pro type allows you to store inside its EEPROM memory, all 4 presets just stored in the “master” loudspeaker, in order to save this complete bundle in each loudspeaker that we want to initialize. This task is possible without any PC connection and supply (the amp module takes care to power the Pro Programming Board).


22 - K Series | How many K10 do you recommend to connect to a 30 Amps circuit?

The K10 Amps will be driven at 220V, for live rock events, and they will drive subs at a 2 ohm load each channel.

Loading the K10 amplifiers with 2 ohms per channel subwoofers the possible mains current per each amp it's about 32 amperes. So, if you need very high output power from the amp with high power density music programs, like live rock, you can't connect more than one amp to each 30 amperes line. If this is not possible for you it's possible to connect up to two amps on a single 30A mains line, reducing the maximum mains current to 15A on each amplifier with the front panel command. With this solution you can average output power reduction with very high density music programs. On all our K series amplifiers we have three different limits for the mains current. The first is a fast peak current limit, max 120 amperes on the K4-K6-K8-K10 and 160 amperes on the K20, with peak to peak intervention, the second is an average mains current draw limitation, user selectable from 15 to 32 amperes from the front panel commands (or from the remote control software) and the third is a long term average thermal limitation, around 3.8KW on all the K series models. So the long term average mains current with a 220V voltage it's longterm thermally limited to around 20 amperes per amplifier.

23 - K Series | Is it advisable to connect two K6 for mid/hi to a single 30A circuit, with the same kind of music program, but with 4 ohm loads?

Yes, without any problem. The power supply of the K6 is exactly the same of the K10, with the same current limits and the same long term thermal limits, but working on 4 ohms loads all the currents are halved and usually medium/high frequencies units need less average power than subs.


24 - K Series | If I need to reduce the current consumption of the amp can I do it via the front panel commands?

Yes, right. This mains current limitation works with intervention time like a standard thermal breaker or a fuse, so even if you have a 15A protected line (like standard domestic) you can supply a K amplifier without problems. This is not a peak current limitation, only an average current limitation, just to avoid the automatic breaker trip.

25 - K Series | If I reduce by 1/2 the amp current consumption, the output power will be reduced by 1/2 too?

No. Or, better, yes and no... It depends by the power density of the music program. A standard live music program has a 1/8 power density, so with a 12kW output power the average power is around 1.5kW. The amplifier mains input to loudspeaker output efficiency is close to 80%, so you will need just 1.9kW from the mains -less than 9A on a 220V line- and the 15A minimum mains current limitation is more than enough to have the output full power. In very hard disco music programs the power density rise up to 1/4, so you will need 18 amperes from the mains and a 15 amperes limitation can reduce a little the average output power. Only the average output power, not the peak output power.

26 - K Series | Is the input eq. stored in the preset?

The input eq. is stored only in the Armonia .pam files and in the Armonia System files. The onboard presets doesn't store the input eq. Threrefore doesn't use input eq. for presets that needs to be used for onboard recall.

27 - Rack Amps | What's cable size do I need to wire my subwoofer?

The amplifier-speakers connection is affected by many factors like the length of the connection and the load value (i.e. the cable resistance that affects the damping factor). Using K-Series amplifiers with DSP you can compensate damping factor with the damping control. In order to connect subwoofer never use cable gauge lower than 2.5 mm2 - AWG 16. Higher section (lower AWG index) has less influence on the damping factor. For example in the case of 2 ohms operations and 50 m cable run, the AWG index should be more than 13 (5 mm2) in order to avoid cheap damping factor.


28 - Rack Amps | Can I use fuse to my speakers?

We do not recommend fusing loudspeakers since a fuse normally blows with a signal that would not damage the speaker or in opposite can be not effective in other conditions. Powersoft amplifiers implement built in processing that acts as a loudspeaker protection. In case the speakers fails, the amplifier goes in protection mode.

29 - Rack Amps | Does your clip indicator represent true output clipping?

Yes, the LED is driven only when the amplifier output fails to track the input. This condition normally results only with a clipping signal, which occurs when the power amp reaches either its voltage or current limit. The last red LED of the bar will light on when the built in compressor circuitry atcs preventing excessive clipping.

30 - Rack Amps | How do I set my amplifier into the Bridge-Mono mode?

This depends on the amplifier you have. DIGAM series cannot work in bridge connections while DIGAM series Q & D can do that. Generally, you will first turn the power off, set the parallel switch to the left position and connect your speaker wires as shown in the user manual of the amplifier. It is then necessary to adjust the gain on both control knobs on the front panel at the same level.


31 - Rack Amps | Is there an easy way to tell if the amp is making the noise, or is it a problem with my system?

The fastest way to tell if the amplifier is the cause of the noise, is to disconnect the input cables from the amp. If the noise is still there, it may be the amplifier; if it's gone, it's a source device inducing noise into the amplifier. If after removing the input connectors from the amplifier you find the noise still present, it will then be necessary to determine if the noise is coming from the AC line: furthermore isolation may be helpful. Try relocating the amplifier using a different AC service, if the same level of noise is present, the amplifier is likely to be the cause. If the noise is lower, the AC service may be the cause. We always recommend to found the reason of the noise (hum) which is normally a result of having a ground loop in the audio system. This is where there are two or more ground references in the system, and current is flowing from one ground point to another. Any piece audio equipment requires one ground reference.

32 - Rack Amps | I want to send my Powersoft amplifier to the factory for service, what should I do?

Please visit service page

33 - Rack Amps | What is Damping Factor?

Dumping Factor is a ratio: load impedance (loudspeaker plus cables) divided by the amplifier output impedance. Just as example if the speaker impedance is 8 ohms, and the amplifier output impedance is 0,01 ohms the corresponding theoretical Damping Factor is 800. Anyway this is a simplified formula since the speaker impedance and amplifier output vary with frequency. Damping Factor is very important on the range of frequency between 10Hz to 400Hz. Amplifier's negative voltage feedback lower it output impedance: properly designed negative feed back corrects output voltage errors induced by the speaker and produces other benefits: Low distortion Low noise (hiss) Flat frequency response.


34 - Rack Amps | Is it okay to run only one channel on my amplifier? Can I mismatch the loads?

You may do both. Your amplifier can be loaded with a very wide range of speaker impedance. The minimum impedance is 2 ohms (4 ohms for Q,Dxxx4 models) for stereo operation while it is 4 ohms (8 ohms for Q, Dxxx4 models) for bridge mono operation. All DIGAM amplifiers are designed to operate safely into infinite load impedance (no speakers). Loading arrangements from one channel to the next can vary in any way you wish. You can load one channel with a distributed voltage load, using an output transformer and capacitor decoupling, and use the other channel to drive a direct low impedance load.


35 - Rack Amps | What is the difference between Class AB, and Class D technology?

There are two different consideration on the amplifier output stages.

IDLE CURRENT: Class AB refers to the amount of idle current flowing in the outputs at zero output. Amplifiers have positive and negative output transistors which handle their respective halves of the output signal. They must "hand off" the output current to each other as the signal passes through zero. A "Class A" output stage begins to transfer current well above its "cutoff point", resulting in much current overlap. This eliminates any chance of "crossover distortion" but generates tremendous waste heat at idle, limiting the possible power of the amp. A "Class B" output stage attempts to make the transfer at exactly zero current, which is impossible to maintain perfectly and leads to "zero crossing distortion" (more commonly called "crossover distortion", a buzzy form of distortion most audible at very low levels). Class AB is the practical compromise--just enough idle current to ensure a smooth transfer between the positive and negative output transistors, without a wastefully high idle current. P

OWER SUPPLY DESIGN: The other major source of waste heat, even in a class AB design, occurs at moderately high output powers. The output transistors drive the speakers by coupling a precise amount of audio voltage from the amplifier's "power supply", which is a steady reservoir of fixed voltage. Most of the time, the output transistors are called on to only deliver a fraction of the power supply voltage to the load, and the unused fraction is consumed as heat in the output devices. A "Class D" design offer far greater efficiency and performance, combining high power efficiency, power output and audio performance. Amplifiers on this class are suitable for a wide range of high-end audio applications. "Class D" efficiency is typically in excess of 95% compared with 60% for a "Class AB" amplifiers. "Class D" wastes less power (limiting the need of heat sinks); this allows smaller power supplies.


36 - Rack Amps | I would like to know the age of my amp. Can you tell me when the amplifier was built?

Each amplifier is provided with his own label were there is a bar code and serial number. The serial number in our computer system tell the assembly date. The same information is present on the bar code.

37 - Rack Amps | What wire should I use to connect my speakers?

For the best speaker damping and least amount of power loss you will want to use the heaviest gauge that is practical. The length of the speaker wire should be considered when considering wire gauge. The shorter the run, the smaller gauge you can use with minimum power and damping factor loss.

38 - Rack Amps | What makes speakers fails?

A speaker can fail due to excessive mechanical stress or excessive thermal stress.

39 - Rack Amps | What is THD?

When an amplifier is driven with a signal, the output of the amplifier is an amplified version of the input signal PLUS any distortion created by the amplifier. All amplifiers and signal processors add distortion to the signal. The levels of harmonic distortion in a high quality amplifiers are so far below audibility that they are basically of no concern. When someone tells you that one amplifier is definitely going to sound better because its THD is rated at .002% versus an amp with .05%, you can be pretty sure that he doesn't know what he's talking about.

40 - Rack Amps | What is loudspeaker ringing?

Loudspeakers have a mind of their own. If you send to them a signal they keep on vibrating after the signal has stopped, due to inertia: this is called "ringing". For that reason the speaker produces sound waves that are not part of the original signal. The loudspeaker cone vibrates and this is like a microphone generating a signal from its voice coil. The signal generated by the speaker is called back EMF (back Electro Motive Force). This travels along the speaker cable back into the amplifier output. Powersoft engineers has developed an exclusive circuitry covered by patent wich solves the issues generate by the back Electro Motive Force.

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