I see regular posts and debates here on improved, newer opamps. So I began wondering if this is something to consider for my favorite DSP unit, the Biamp Tesira Forte.
Unfortunately, I don't have the schematics but this is a BALANCED in/out DSP unit:
https://products.biamp.com/product-...A8B78ABC|204E989F-7D8B-4FB6-9BDD-C5B7739EBB65
I can say (because I looked inside) it has three LM833 for each channel input and three LM833 for each channel output. So theoretically, I can replace each of these opamps with something. Now the question is, with what and would it make a noticeable difference?
Unfortunately, I don't have the schematics but this is a BALANCED in/out DSP unit:
https://products.biamp.com/product-...A8B78ABC|204E989F-7D8B-4FB6-9BDD-C5B7739EBB65
I can say (because I looked inside) it has three LM833 for each channel input and three LM833 for each channel output. So theoretically, I can replace each of these opamps with something. Now the question is, with what and would it make a noticeable difference?
Don't bother,audio,especially line level stuff is one of the least demanding activities for an op amp.Maybe in a mic or phono preamp differences could be heard at high gains due to the speed of the op amp and input current noise and such.Also faster op amps require more care to the circuit design,so they may not be exactly drop in replacements,this combined with the risk of damaging an expensive unit,I,personally strongly recommend sitting this one out
Nope, don't really agree, otherwise LM358's would be fine for audio, which they aren't.
Audio opamps demand good levels of performance for some parameters (distortion, 1/f noise, EMI rejection) and others aren't so important (like DC offsets or long term drift).
But yes, don't swap them for the point of it, unless you are sure the circuit is compatible with the replacement for decoupling, stability, bias current level, drive capability etc
Not really. You just need to know the levels that it is working at, so you can gauge whether the noise, drive, and frequency capabilities are good enough. LM358 doesn’t even come close to good enough, LM833 is well within the normal range of what can be used. And I wouldn’t go swapping out anything without at least some objective measurements to guide your decisions. Most of what actually happens here is expectation bias. You think you’ll hear something so you do. And it can be very real to you, and the whole while you are chasing phantoms.
Expectation bias can work both ways. A skeptic could put in LM358’s, put in the required resistors from the outputs to the negative rail and hear absolutely no difference. But most of us could find some program material that quite obviously showcases it’s 0.3 V/us slew rate limit. When something is broken, it IS broken.
Expectation bias can work both ways. A skeptic could put in LM358’s, put in the required resistors from the outputs to the negative rail and hear absolutely no difference. But most of us could find some program material that quite obviously showcases it’s 0.3 V/us slew rate limit. When something is broken, it IS broken.