DanielT
Major Contributor
- Thread Starter
- #481
Then maybe Tangband isn't imagining things when he claims there are audible differences when he rolls his OP amps?Guys, just leave tangband alone and have pity on him.
- He's wasting his time
- He would never pass a blind test
- Listening to 20 minutes of music in a row for comparison is nonsense
- Experienced listeners need 5-10 seconds, after 30 seconds it is no longer possible to verify differences
- The Aiyima a04 is completely unsuitable for OPAmp rolling
- All the circuitry around the OPAmp is cheap and buggy
- The SE to Balanced circuit with inverted OPAmps connected in series also generates time errors.
- The power supply with one-sided 12v is even worse
- 0-12v with artificial ground somewhere around 6v
- Cheap switching regulator to generate the 12v with bad filtering
- Extremely dirty 12v supply, just measure it
I even believe that the OPAmps sound different in the Aiyima a04. But that will rather be the effects of mismatches and wrong working environments for the rolled OPAmps. Just go with an oscilloscope.
The LM4562 in particular is known to oscillate in such circuits. This often leads to a preference.
There are reasons why the Topping PA5 sounds so much better and cleaner than all the cheap TPA235X units. All the shortcomings listed above do not exist.
You mention Topping PA5. Probably a great amp, as long as it works:
Poll for Topping PA5 owners only please.
Poll for PA5 owners to report product defects. Discussion for any solutions. I think it would be useful to get a handle on some numbers to estimate just how wide spread the issues are. Addendum: Here is Topping's response to the PA5 issues...
audiosciencereview.com
Maybe Topping TP RA3 can be an alternative to Topping PA5, if you accept the PA look.
TP RA3 Rackmount Amplifier Review
This is a review and detailed measurements of the TP (Topping) RA3 stereo balanced rackmount amplifier. It was sent to me by the company and costs US $229. Yes, this is a new sub-brand from Topping. I quite like it. The large and highly visible volume level is as gorgeous to look at as it is...
audiosciencereview.com
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