Here is another thread that I started on repairing these guys.
https://www.diyaudio.com/forums/solid-state/376026-2sc3281-2sa1302-sub-swap-tech-help.html
Quick summary: I blew an output.
These speakers were obviously worked on by another tech. The tech left notes about blown speakers and ground hums, all of which were solved by just replacing the electrolytic caps.
However, ALL 4 bias controls are turned all the way cold (2 speakers each being bi-amped = 4 controls)
So, I'm looking for some guidance on getting the bias set right, and have just a base understanding. i.e. Bias is for setting the crossover distortion(?)
Schematic attached.
Surely there must be more than my initial thought of just hooking a scope to the speaker output of these amps and adjusting the bias control until the crossover distortion is minimal? Watching the top and bottom half of the sinewave lining up?
https://www.diyaudio.com/forums/solid-state/376026-2sc3281-2sa1302-sub-swap-tech-help.html
Quick summary: I blew an output.
These speakers were obviously worked on by another tech. The tech left notes about blown speakers and ground hums, all of which were solved by just replacing the electrolytic caps.
However, ALL 4 bias controls are turned all the way cold (2 speakers each being bi-amped = 4 controls)
So, I'm looking for some guidance on getting the bias set right, and have just a base understanding. i.e. Bias is for setting the crossover distortion(?)
Schematic attached.
Surely there must be more than my initial thought of just hooking a scope to the speaker output of these amps and adjusting the bias control until the crossover distortion is minimal? Watching the top and bottom half of the sinewave lining up?