31-01-2019, 02:44 PM
For an example of an amp that has a passive Baxandall with only +/-6dB of range, check out the Rotel RA-930.
https://elektrotanya.com/rotel_ra-930ax....nload.html
The insertion loss from this circuit is 8dB. That's likely as good as you'd get with a passive circuit. For that and various other reasons, I much prefer active, and good audio op-amps are cheap.
One trap: the input impedance of these circuits (active or passive) vary with frequency - you might need to look at what precedes them and consider adding buffer stage - just a single op-amp. Of course, if you're doing that, then that could be used to provide some of the gain lost in the network...
I'd expect a TDA2030 or TDA2050 or LM1875 would give better results than that Sinclair module, but if you already have them...
https://elektrotanya.com/rotel_ra-930ax....nload.html
The insertion loss from this circuit is 8dB. That's likely as good as you'd get with a passive circuit. For that and various other reasons, I much prefer active, and good audio op-amps are cheap.
One trap: the input impedance of these circuits (active or passive) vary with frequency - you might need to look at what precedes them and consider adding buffer stage - just a single op-amp. Of course, if you're doing that, then that could be used to provide some of the gain lost in the network...
I'd expect a TDA2030 or TDA2050 or LM1875 would give better results than that Sinclair module, but if you already have them...
