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Discrete OpAmp Review: Sonic Imagery vs Sparkos
- Thread starter amirm
- Start date
THD+N
THD no N just for consistency and resolution
Good stuff. What we're the load conditions?
No load.
2k and 600 ohms would be good to see
Single ended Class A output stage for now. Designed a low distortion buffer to be included in the loop. Not on this board yet.
I noticed in Purifi's specs that the input impedance is 2.2K unbalanced and 4.4K balanced. Not exactly universally compatible with all preamps.
It would be interesting to know what the input impedances are for the Sparkos and Sonic Imagery opamps. Hopefully significantly higher...
It would be interesting to know what the input impedances are for the Sparkos and Sonic Imagery opamps. Hopefully significantly higher...
Depends on the buffer board but they usually are around the standard 47k ohms.
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Thank you always, amirm, for this nice objective measurements and comparisons.
In APOLLON AUDIO's site, we can find some "subjective" descriptions for these two OP amps;
https://www.apollonaudio.com/apollon-audio-purifi-1et400a-stereo-amplifier-input-buffer-board/
And I have been waiting some objective comparisons between the two.
Do you have any guess and/or idea to correlate your objective results with the above APOLLON's subjective descriptions?
In APOLLON AUDIO's site, we can find some "subjective" descriptions for these two OP amps;
https://www.apollonaudio.com/apollon-audio-purifi-1et400a-stereo-amplifier-input-buffer-board/
And I have been waiting some objective comparisons between the two.
Do you have any guess and/or idea to correlate your objective results with the above APOLLON's subjective descriptions?
@JohnYang1997 is your discrete design showing up in any product?
How about a GB for a mono buffer board for purifi amps. I know it's wishful thinking given your designs are likely owned by topping.
But I felt there is no harm in checking with you.
How about a GB for a mono buffer board for purifi amps. I know it's wishful thinking given your designs are likely owned by topping.
But I felt there is no harm in checking with you.
Califmike33
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You guys are a bunch of idiots that you sit here and follow measurements to make your decisions on item the sparkos op amps sound absolutely amazing I don't care what your measurements say.
Whoever started this channel it's a complete scam and a racket that you got people hanging on measurements instead of listening to the item.
I put these amps inside my EVGA nu sound card the difference is absolutely nothing short of amazing I don't care what your charts and graphs measure what the ear hears the ear doesn't pick up on charts and graphs.
This is such a b******* freaking website.
Whoever started this channel it's a complete scam and a racket that you got people hanging on measurements instead of listening to the item.
I put these amps inside my EVGA nu sound card the difference is absolutely nothing short of amazing I don't care what your charts and graphs measure what the ear hears the ear doesn't pick up on charts and graphs.
This is such a b******* freaking website.
Got it.
Anything else you'd like to get off your chest? Not sure why you'd be on a site that has anything to do with science...
Veri
Master Contributor
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Good for you. I'm still not buying any though.
I'm all for measurements. And it is obvious what some measurements mean. But listening to music is an emotional activity. Come back once you can explain to me how the measurements explain the human emotional response to music. You seem to simplistically worship numbers that you don't understand in the human emotional context. In contrast, I could plunge your hand into boiling water and predict your emotional and physiological response. But I bet you have no idea what measured threshold values makes someone cry at the opera, or urinate in their pants at a Britney Spears concert, or start to mosh, or even tap their foot.
Now that you’ve gotten that off your chest, grab another beer and tell us how you feel about masks/vaccination. We aren’t coming for your Sparkos. Turn ‘em up! Enjoy. Myself, I respect and applaud Amir’s efforts at objective measurements and doubt there’s much “racket” to be had from the site. I particularly appreciate this topic as I was a bit confused by all the options myself. Not as much now.
Would have been interesting to see how the TI Opa1612 would have performed as well in the custom buffer board.
As it is, if it measures worse than the eval1's buffer (fe02 iirc) which uses the Opa1612, is it because the buffer board is overall inferior or only the opamp?
As it is, if it measures worse than the eval1's buffer (fe02 iirc) which uses the Opa1612, is it because the buffer board is overall inferior or only the opamp?
jokan
Addicted to Fun and Learning
I would like to see the OPA1656, a burr brown sound plus chip. I've had the Burson V5i, and the V6vivid and I have no space to put a sparkos labs opamp single or dual channel. But I would still like to see the OPA1656 tested. It's a virtually unknown chip as when you search on Digi-Key it doesn't come up as soundplus. You have to load the PDF file to even learn about its existence.
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