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Any Point In Upgrading Purifi Based Amp with Sparkos Opamps?
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DVDdoug
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It's unlikely to make any difference. Purifi has a good reputation and I assume their amps are already better than human hearing.
I don't know anything about the Purify circuitry but most op-amps used in audio are used in non-critical, low gain, circuits unless we're talking about a microphone preamp or a phono preamp.
One of the wonderful things about op-amps is that their high open-loop gain allows for negative feedback (corrective feedback) which makes the op-amp characteristics less critical.
...That's also the same reason you can usually swap-in another random preamp without fouling anything up.
I don't know anything about the Purify circuitry but most op-amps used in audio are used in non-critical, low gain, circuits unless we're talking about a microphone preamp or a phono preamp.
One of the wonderful things about op-amps is that their high open-loop gain allows for negative feedback (corrective feedback) which makes the op-amp characteristics less critical.
...That's also the same reason you can usually swap-in another random preamp without fouling anything up.
olieb
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audible? very probably not.
benefit? definitely yes, to Sparkos.
Snake oil.
The Purifi evaluation kits, which are supposed to showcase their performance, use TI OPA1612 opamps. If you think Purifi doesn't know how to pick opamps, then why do you want to trust them with the rest of their amplifier design?
The Purifi evaluation kits, which are supposed to showcase their performance, use TI OPA1612 opamps. If you think Purifi doesn't know how to pick opamps, then why do you want to trust them with the rest of their amplifier design?
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Let's start with a known quantity: Purify-based amps work, and work at (or close to) the cutting edge of amplifier performance. AFAIK, their distortion profile is completely below the threshold of human hearing. This means that the characteristics are completely inaudible. See here, for example:
Review and Measurements of Purifi 1ET400A Amplifier
This is a review and detailed measurements of the Purifi 1ET400A Class-D amplifier module. Company was kind enough to send me a complete, assembled kit consisting of two modules, power supply and case, ready to go. They have not disclosed the cost of the unit. Modules will be available to DIY...
www.audiosciencereview.com
Therefore ... any change that would be audible to a human being means that the performance of the amp has been degraded, and that is of absolutely no benefit.
Jim
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MaxwellsEq
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You are in luck. Amir managed to do some op amp comparison measurements here:
audiosciencereview.com
Discrete OpAmp Review: Sonic Imagery vs Sparkos
Recently I reviewed the Nord Three SE 1ET400A Dual Mono Stereo Amplifier. That unit came with the Sonic Imagery's 990ENH discrete operational amplifier ("opamp") in the buffer stage (pre-amplifier). The owner then ordered a set of Sparkos Pro SS2590 discrete opamps. This gave me a chance to...
audiosciencereview.com
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