I get occasional crackling noise in the right rear channel. It´s not the speaker and the noise is there on all inputs. The very odd thing is that it doesn´t seem to be linear with the volume level.

All, I posted this at DIYMA, and didn't get too may helpful responses, so figured I'd ask the Hive Mind. Back in the '90s, I used to set amp gains by turning the level pot all the way up and then ...

Modern op amps have much higher operating bandwidths than their predecessors. These new devices are excellent building blocks that can greatly simplify the design and construction of high-bandwidth ...