Dave Plowman (News) wrote:
I've been playing with this active crossover
No workee it seems ...
and have used TL072 which I have lots of. But wondered what would be
better - without paying a fortune?
whatever 5532, OPA 275, BB 2134 come to mind, OPA 275 or 176, if applicable,
are very well behaved turn-on and -off wise, nice if you have a power
outage. Remember a 100 Ohm series resistor on the output.
Do not run your power amps flat out, attenuating 15 dB makes a lot of sense
and greatly reduces the risk of mishaps.
5532's surprised me in a listening test I was a part of but are perhaps "too
forward". OPA275 are perhaps a wee bit laid back. My favourites are OPA176
or the also "up front" 2134.
Most circuits I can imagine have two amplification stages, using different
opamps may sound better than twice the same.
Using a digital controller has interesting properties: steeper x-over
possible, adjustable eq for troublesome midrange-units and DA conversion
Feel free to disagree, those who think there is no difference should buy the
cheapest that sounds no different from the best to them. There are vastly
costlier alternatives out there.