Electronic control

Electronic control

Dynamic protections

In order to increase system reliability, APG integrates complex and innovative dynamic protection systems that are adapted to each speaker. Excursion and temperature settings are analogically or digitally simulated and controlled, which enables the speakers to be used safely up to their maximum performance ratings.


Membrane excursion
Over excursion can damage the membranes mechanically, and even provoke their destructions. APG set up a system for detecting the membrane movement, in order to verify if a critical value is reached. In this case, a sliding high-pass filter limits the lowest frequencies amplitudes.


Voice coil temperature
Exceeding the power rating of the speaker leads to overheating and cause the thermal destruction of the voice coil. A control system simulates the heat dissipation capacity in time of the voice coil, and reduces the signal amplitude if the limit level is exceeded.


APG expertise in loudspeaker optimisation

APG designs the adequate filtering for each speaker. All our speakers are engineered with advance acoustical studies, to optimize response and efficiency. Our electronic filtering simply allow us to add final tuning to make it perfect. The final results are validated by listening tests and beta-testing on the field.

We listen very closely to our speakers… and to our users!


A Powersoft powered amplification 

APG has chosen a Powersoft amplification for its speakers. On top of uncompromised sonic quality, reliability, and comfortable ergonomics, the Powersoft-designed products also environmentally friendly. They developed a concept of Green Audio Power, regrouping 2 major technologies:

  • Power Factor Correction (PFC) integrated into switching mode power supply
  • Class D PWM (Pulse Width Modulation) high efficiency output stage

As a result, the absorbed current from the mains will be reduced by approximately 40% for SA amplifiers.


The Power Factor Correction (FPC)

The Power Factor Correction allows to "scale" the current drawn from the mains to what is necessary to amplify the signal.

This is very useful for both Touring equipment, where the characteristics of mains current can vary significantly from place to place and Fixed Installation equipment, where lower power levels are spread over a longer period producing a significant total energy consumption.

The benefits produced by the adoption of this technology in terms of energy savings and lessening the global warming impact include: energy savings and lower carbon footprint (equivalent CO2 emissions) with a reduction of approximately 40% compared to amplifiers without power factor correction for the same output power. Reduced heating generation due to cable losses due to lower RMS currents from the mains.


Class D - PWM (Pulse Width Modular) Output Stage

Introduced by Powersoft in 1995, this technology has been widely adopted in the market.

The key aspect of this technology is based on extremely high efficiency that allows it to transform all the energy drawn from the mains into usable power, and to recycle the reactive energy coming back from the loudspeakers (typically, this can be very damaging for traditional linear amplifiers). This technology produces equipment with useful features for both touring and fixed install equipment. Specifically, the main benefits of this aspect in amplifiers are:

  • Ultra high efficiency (0,95-0,99%) and consequent reduction of the required energy for the same output power
  • Reduction of the cooling system.
  • Less amplifiers (with smaller size) to run the same PA system which directly impacts CO2 emissions because it in turn reduces the number of trucks required to move equipment for large events. And travel is a principal cost item for any event or tour.