I found the functions of the pins as follow:įigure 1. Googling this yields some information about the pins but it didn’t solve the problem because nobody posted about the pins functions. Since the connection from amplifier circuit to right satellite speaker use 7pin mini-DIN connector, I try to search about ATP3’s mini-DIN pinout. For tone control, ATP3 use IC LM1035 from National semiconductor which use DC controlled bass, treble and volume technology.īut I have problem because all speaker control is on ATP3’s right satellite speakers. ATP3 configured the IC to work both in single ended and bridge, 2 channel in single ended configuration for powering satellite speakers and 1 bridge configuration for powering the subwoofer.

This amplifier IC can be configured to work either in dual bridge or quad single ended amplifier. The heart of this amplifier is quad power amplifier TDA7337 integrated circuit (IC) from SGS-Thomson. Volume, bass, treble control and right speaker is connected to amplifier using 7pin mini-DIN connector. Left satellite speaker is connected to amplifier using RCA connector. Input signal is connected to amplifier using 3.5mm stereo connector. I opened up the ATP3 subwoofer and found that amplifier circuit is located inside subwoofer enclosure. It finally gets amplified in the brown power amp.In this project, I want to replace ATP3’s original satellite speakers with my Selenium surround speakers. Signal then goes through a low-pass, a small equalizer and a compressor (the big purple box). The small green box on its left merges the left and right channels to forward it to the subwoofer section, which is the complete left half of this diagram (except the red box on the left, which is just power). In the middle yellow box there's some trebble/volume/bass control.

The sound comes in on the right, in the green box. The block I want to short-circuit is the pink one on the left. My question is: should I disconnect the input and output from the compressor (in that case should I remove power supply as well, which would be very annoying), or can I leave it connected but short-circuited? I will connect the input to the output so it gets forwarded to the next stage. Its active components are a JFET and four op-amps. I have an Altec Lansing ATP3 2.1 audio system PCB which I reverse-engineered, and I would like to bypass the JFET compressor that's on it.

Altec lansing atp3 left speaker