DIY implementation of PFFB in an existing TPA3255 amp

[Bruce Morgen]

The difficulty of working with surface mount components and the probable near-zero ROI involved notwithstanding, is it practical to implement PFFB in an existing TPA3255 amp circuit as a DIY project?

Asking more out of curiosity rather than serious intention.

 

[KSTR]

The simplest passive form of PFFB as per TI's App Note https://www.ti.com/lit/an/slaa788a/slaa788a.pdf could be easily implemented in any typical stereo amp as the only points you need access to (besides GND, output and power supply) is the channel input capacitors and the added circuitry is minimal and well-documented. You'd need to make a new input board (with gain as circuit gain is reduced) and that's it, from a conceptional POV. Practically, actual required effort depends on what platform you are using and of course on your skill level.