It’s the same as the BTSB Panel Mount Buffer here:
https://www.diyaudio.com/community/threads/btsb-panel-mount-buffer.379030/#post-7040598
Default setting is 6dB on buffer. Amp intrinsic gain is 22dB for total 28dB.
DIP switches are 0dB/6dB/14dB/20dB.
I would say using 0dB for 22dB overall is good if you have a powerful preamp. But I would not go 14+22 for 36dB unless you want to use something like a smartphone to drive it to clipping. Don’t use the 20dB. That’s too much for this amp.
I have more details on which to DIP switch to flip if you can’t make sense of the schematic.
https://www.diyaudio.com/community/threads/btsb-panel-mount-buffer.379030/#post-7040598
Default setting is 6dB on buffer. Amp intrinsic gain is 22dB for total 28dB.
DIP switches are 0dB/6dB/14dB/20dB.
I would say using 0dB for 22dB overall is good if you have a powerful preamp. But I would not go 14+22 for 36dB unless you want to use something like a smartphone to drive it to clipping. Don’t use the 20dB. That’s too much for this amp.
I have more details on which to DIP switch to flip if you can’t make sense of the schematic.