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Class D Switching Power Amplifiers and Power D/A conversion

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Old 18th January 2013, 03:19 PM   #21
aarvin2 is offline aarvin2  Mauritius
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You said that the bigger chips were not as detailed , would you mind saying how ? In what way are they not detailed ?

May I know which ones you have tested please ?

Last edited by aarvin2; 18th January 2013 at 03:34 PM.
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Old 18th January 2013, 04:22 PM   #22
cotdt is offline cotdt  United States
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Quote:
Originally Posted by Pano View Post
That could be higher order harmonics, like 7th and so. They tend to make an amp sound bright. I need to get in there and measure a few T-Amps again. Maybe that's what is bothering you.

When I was in my 20s I was not a fan of tweeters. Most sounded artificial and "Hi-Fi" to me, not like the sounds I hear in nature. 30 years later, they don't bother me as much. I still hear a lot of speakers with too much tweeter, tho . With T-Amps and others with a low pass filter on the output, you have to be careful with impedance. Too light a load and you will get a real boost at the very top. For us old folks, we may not notice it much, younger ears will.

FWIW, in tests of T-Amps vs Gainclone vs Tube (all well built), we have always picked tube, but the T-amp was not far behind. The Gainclones always sounded muddy and closed in, no space. No bad, but not as good as the tube or Tripath. Tastes vary,
I do measure a rising treble response on my T-amp... but that occurs past 20kHz which even I could not hear. I don't know what's going on. If you find anything interesting with your measurements, I'd be very curious to learn about it.

I agree that T-amps are more lively than Gainclones. But I often wonder if it is the Gainclones that are more accurate for studio monitoring. The internals of the LM3875 is a more traditional linear design.
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Old 18th January 2013, 05:03 PM   #23
Octavia is offline Octavia  United States
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The truth of the matter is you cannot separate which T amp is "best" without considering what speaker it will be required to drive. Having said that there are superb T amps at various power levels, the Maedos Tristan being one, the Topping TP60 another. The power supplies and a clean source of power will also be very significant to performance. Until you get up to the levels of N-Core from Hypex, or class A tubes, or other top level amps, the better T amps represent the best sound for the $.
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Old 18th January 2013, 10:50 PM   #24
aarvin2 is offline aarvin2  Mauritius
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Quote:
Originally Posted by Octavia View Post
The truth of the matter is you cannot separate which T amp is "best" without considering what speaker it will be required to drive. Having said that there are superb T amps at various power levels, the Maedos Tristan being one, the Topping TP60 another. The power supplies and a clean source of power will also be very significant to performance. Until you get up to the levels of N-Core from Hypex, or class A tubes, or other top level amps, the better T amps represent the best sound for the $.
Hi Octavia, when you say the BEST SOUND, do you mean a pleasing sound ?? or a sound which is the closest, honest and brutal representation of the sound source ??

I'm actually looking for an amp which lets me hear all the engineering flaws of a track, instead of making everything sound pleasing, warm and sweet.

I am looking for an analytical amp , any tips please ?
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Old 18th January 2013, 11:26 PM   #25
Octavia is offline Octavia  United States
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What I meant by best (for me) is most revealing of the original recorded event. Not something euphonic but also not something etched and over emphasizing highs that one doesn't really experience either in concert or the recording studio (and yes I have some limited experience in both). Back to my earlier point - what speakers are you trying to drive? Case in point, I have Quad 63 electrostats in a stereo set up, Genesis in a home theater set up, AN12's in a FAST set up, (ok there are others but you get the point) each set of speakers have different amps with which they mate best. Like alot of things in life "context" is everything. Might help you get where you want to go if people knew 1.what speakers and 2. what budget. If you have a speaker that dips below 2ohms or has some other difficult load aspect your going to narrow the amp choice alot, but for speakers that have a more kindly load my guess if you can find a great T amp within the right power and price range that can work.
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Old 19th January 2013, 03:28 AM   #26
cotdt is offline cotdt  United States
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One concern about the Tripath chips is that production ceased a long time ago. One wonders where all these chips are coming from.
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Old 19th January 2013, 05:22 PM   #27
Bare is offline Bare  Canada
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From unathourised production lines.. Dohh! IMO most are Fakes.
But then that shouldn't be a surprise when even Military Aircraft are being seriptitiously fitted with Fake chips.
Even recently saw a Ta 2020 with Gold plated pins.
Recently built a DIY point to point Ta2020 according the the Tripath datasheet.
Using a ..Known Genuine.. made in USA Chip.
Resultant sound is markedly better than the 'Korea' made ones.
IMO most impressions/reviews of the Goodness of the Tripath Amps are likely based on substandard chips :-)
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Old 19th January 2013, 05:54 PM   #28
Pano is offline Pano  United States
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Quote:
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Using a ..Known Genuine.. made in USA Chip.
Who made that chip? AFAIK, Tripath was always a fabless company. Most of its chips were made in Korea. I suppose they still are, even tho the IP was bought a few years ago. Don't remember ever seeing a Made in USA Tripath chip.
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Old 19th January 2013, 06:01 PM   #29
cotdt is offline cotdt  United States
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Does this mean that the fake chips sound better?
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Old 19th January 2013, 06:10 PM   #30
Pano is offline Pano  United States
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Yeah, it might!
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