I was just browsing some local stores and saw some RCF Ayra Pro speakers for pretty cheap, and they have "FIR 0-phase DSP" - so presumably a decent "DSP chip" inside them. And that got me wondering, if people are selling these with blown speakers/amps/etc, that maybe the DSP part of it could be salvage and repurposed for some cheap DIY adventures? So I found some pics here, and labelled some things, but I don't know that much about electronics...


- So it's got apparently got 2x class D amps in it. I imagine most of the amp components are on PCB1, but maybe also PCB2? I can't see how the powered-signal is getting from PCB1 to PCB2 though? I wouldn't think any of the 6x black wires are carrying it, because they are much thinner than the speaker wires.
- Probably some of the black wires are carrying the audio-signals from the DAC(s) on PCB3 to PCB1? I would think at least 3 wires are doing this (2x positive signal wires, and 1x common ground), but maybe its 2+2 with the last 2 being for "control"?
- So presumably all the DSP action is happening on PCB3, which I scaled up. The big square chip is presumably the smarts, which I labelled "APU" (audio-processing-unit?). Somewhere there has to be a 1 channel of ADC (signal in), and then 2 channels of DAC (woofer + tweeter out). Maybe that's part of the "APU", but maybe it's got something to do with the 5x8-pin chips? (and possibly there is a 6th 8-pin hidden from view near 8pin5?).
- Originally I was hoping to see a chip that stood out as unique, like maybe it was like a bios chip on a PC that holds the "firmware". At first "3pin" stood out this way (I thought it might have 6 pins), but maybe it's just a transistor or op-amp? So maybe the firmware is stored directly on the "APU", but possibly it's accessible via the pins that I labelled "I/O pins"?