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RE: seems a bit drastic

Posted by madisonears (A) on July 25, 2017 at 22:13:31

In Reply to: RE: seems a bit drastic posted by KanedaK on July 25, 2017 at 06:58:22:

The output opamp could see a capacitive load from IC's. Any opamp "inside" the xover should be fine.

Once again, if the 2134's were properly decoupled (local 0.1uF bypass + and - to ground) and stable, odds are good that the 4562 will also be stable. Its output overshoot is only slightly more pronounced into a capacitive load than the 2134, but both are sensitive to rising capacitance so you should damp with the 100 ohm resistor. Of course, there are myriad other differences between the two, but not many that will affect their stability and performance in a crossover circuit. The 4562 GBP is much higher than the 2134, which might make a marginal 2134 application into an unacceptable 4562 implementation.

I have found that the sound each produces is different, with the 4562 providing far more high freq detail, nearly an excess sometimes tending toward a sterile sound. It seems the bass was more prominent from the 2134, but that may have been just because of more relaxed highs. Perhaps my 4562's were oscillating and I never knew it! But I doubt it because I took all the proper precautions and the system performed suitably for a couple years that way, so it must not have done damage to anything.

There is a ton of info regarding opamp comparisons, most of it bewildering and inconclusive because everyone has their own taste and the parts are used in all kinds of applications. The cost of experimenting is certainly not prohibitive unless you're determined to blow something up. I'm not a technician, and I have managed to try a few opamps in my active xovers without destroying anything.

Peace,
Tom E
berate is 8 and benign is 9

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