What is a Programmable Frequency Module (PFM)?
A Programmable Frequency Module (PFM) is an AudioControl exclusive inclusion on a variety of products, including AudioControl's Architect amplifiers.  In effect, it is a crossover set on the low end of a frequency band for each speaker.  The PFM installed at the factory is 40Hz.  You can order PFM chips to meet your needs by calling AudioControl at 425-775-8461.  Chips are available in 20Hz, 25 Hz, 35 Hz, 40Hz, 45Hz, 50Hz, 60Hz, 65Hz, 70Hz, 80Hz, 90Hz, 100Hz, 120Hz, 130Hz, 150Hz, 170Hz, 200Hz, 270Hz, 350Hz, 500Hz, 725Hz, 950Hz, 1500Hz, 2000Hz, 2600Hz, 3000Hz, 3500Hz, 4000Hz, 4500Hz, 5500Hz, 6000Hz, and blank.

Why a PFM?

Architect amplifiers are often used to push small drivers, such as in-wall speakers and outdoor speakers.  Drivers this size are not designed to reproduce low frequency tones, and can even be damaging in some cases!  AudioControl developed the Programmable Frequency Module to protect speakers.  Another benefit of the PFM is the re-distribution of amplifier power.  An amplifier can't tell the difference between an in-wall speaker, a floor-standing speaker, or a subwoofer.  Thus, it distributes it's power to whatever frequencies the source provides (20Hz -20KHz).  The PFM tells the amplifier what frequency is the bottom, allowing it to save the power necessary to drive these frequencies and redirect this power to the remaining frequencies.  This is one reason listeners perceive the sound produced from an AudioControl amplifier to be more powerful than the wattage rating suggests.