What type of wire do you use when connecting from a DAC directly to your ear/head? Otherwise you are listening to sound waves generated by speaker drivers, not DACs.
PS. Refer to post #220 of this thread.
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Q: How do you listen to DACs?
As Spock would say, illogical. LOL!
Then 5 minutes later,
As Spock would say, illogical. LOL!
So Evenharmonics, concerning the reason I came to this thread in the first place, what say ye concerning the OPA1656 for use in ADC/DAC retrofit applications having +/- 15vdc rails for the analog? (LOL, I promise its a straight up question, I'd actually like to hear your thoughts.)
Did You ask that really? From a troll of that level?!
(sorry, I was referring to the message one step above..)
(sorry, I was referring to the message one step above..)
I don't know if anyone is still following this thread. First, I know nothing about Op amps or measurements- total newbie. After reading this article on the measurements of a 3e Audio amp ,
3e Audio SY-DAP2002 Review (DSP Amplifier) | Audio Science Review (ASR) Forum I decided to change the op amp to improve measurements by replacing the factory OPA1602 with a LM4562, as recommended. Looking at prices, the 1602 is £2.30 and the 4562 is £1.40. Wasn't expecting that. It's a shame that the reviewer didn't listen to the amp with both OP amps. In fact I don't think he even listened to it as at no point is sound mentioned. Perhaps the one with poorer measurements sounded better.
Personally, I was pleasantly surprised by the sound quality of my first Class D (tpa3250), though much brighter than my A/B amps I'm used to. If I could tone down the upper mids I'd be happy to use it full time. Have tried to use the internal DSP but unable to save to EEPROM board.
Which brings me to my question. If different Op amps do have different tonal qualities, is there on that would tone down the upper mids? Not bothered about spending a few quid to improve the sound.
Cheers
3e Audio SY-DAP2002 Review (DSP Amplifier) | Audio Science Review (ASR) Forum I decided to change the op amp to improve measurements by replacing the factory OPA1602 with a LM4562, as recommended. Looking at prices, the 1602 is £2.30 and the 4562 is £1.40. Wasn't expecting that. It's a shame that the reviewer didn't listen to the amp with both OP amps. In fact I don't think he even listened to it as at no point is sound mentioned. Perhaps the one with poorer measurements sounded better.
Personally, I was pleasantly surprised by the sound quality of my first Class D (tpa3250), though much brighter than my A/B amps I'm used to. If I could tone down the upper mids I'd be happy to use it full time. Have tried to use the internal DSP but unable to save to EEPROM board.
Which brings me to my question. If different Op amps do have different tonal qualities, is there on that would tone down the upper mids? Not bothered about spending a few quid to improve the sound.
Cheers
The books explain much about how to do proper perceptual testing by today's standards. If anything, they show why guys like Baxandall and Self should be taken with a grain of salt when it comes to their opinions on what humans in general can or can't hear.
I agree in principle, but what frequently gets lost in the rhetoric is the fact that the circuit layout is as important as the parts used. I found this out the hard way...I had a preamp circuit that I made a full ground plane PCB for to test the then brand new LM4562. It looked good out to the limits of a 100 Mhz scope, and sounded fine too. Then out of curiosity, I popped them into a preamp I built many years ago that originally had TL072 opamps in it that was built on perf-board. In spite of a similar circuit topology (with slightly higher impedance scaling) it sounded kind of, um, not the greatest. Putting it on the scope showed some slight ringing on square waves that wasn't there before. So I believe that what many are perceiving as opamp sound differences really comes down to implementation. When it's done right, and the device is operated within its' design limits, it's really hard to detect any real difference in the "sound" of various devices.
Mike
That thing you want toned down is caused by distortion, noise, short filters in dac chips, etc. The ear is sensitive to it in that frequency band. Not simple to fix.
I'm just learning circuit layout design---can you describe to me exactly WHAT makes the sound different in alternate layouts?
When you swapped the opamps, did you put a 100nF cap between the rails and a 22pF cap across the feedback resistor to avoid any oscillations? That's what I do when upgrading opamps.
You haven't read Baxandall.
You haven't quoted anything he said that supports your claims. Its not up to me to provide support for your claims, you can do it or not. If not, then we can safely assume you are giving your personal opinions, nothing more.
