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RE: update on the Al Sekela tweak

Zobel's on amplifier outputs are for most likely.....as you say....amplifier stability. The RC we're talking about here utilizes a much smaller value capacitor and is optimized for terminating the far end of speaker wires in the RF band. The theory is that speaker wires acting as antennas can source RFI back into an amplifier output where it might interact with the feedback configuration.

It's an unusual situation, but I have seen it firsthand on a few occasions.

The "choke tweak" is a different scheme and forms a real low-pass filter just above the audio band and obviously increases load impedance as frequency rises. Thus, you don't have the termination configuration an RC network provides. The reason the "choke tweak" is providing audible benefits in certain situations is because of this low-pass filtering effect and not an RFI-related operation

This has all been hashed and rehashed on this forum quite a few times during the years. :)

Dave.

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