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Class D Switching Power Amplifiers and Power D/A conversion

TPA3250 somebody is listening?
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Old 22nd February 2018, 02:51 PM   #151
swank42 is offline swank42
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Originally Posted by KaffiMann View Post
It's not like it's the magical unicorn of class D amps. If, for some reason, you are expecting fairy dust to emerge from your speakers, then maybe you need to change something else.
From the sub-$75 pre-built amplifiers, this does seem to be the best I've heard. Is there anything better in this low price range?

It sounds clearly better than the Nobsound dual-chip and Breeze single-chip TPA3116 units I have. The noise of the SMSL SA-98E TDA7498E made me send it right back. Moreover it sounds better than my vintage NAD amp and my Chinese tube amp which costs much more.

Is there a sub-$100 pre-built (not just boards for this comparison) amp that sounds better?




P.S. I'd be very interested in comparisons with the Yamaha R-S202 as well, since that can be had for ~$120)
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Old 22nd February 2018, 06:44 PM   #152
KaffiMann is online now KaffiMann  Norway
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I was thinking more along the lines of: if you really want that kind of experience, no amplifier will never be able to provide it for you, no matter what type or topology.

It is one of the better options sub 100$, the LM3886 can sound really sweet with a battery bank PSU, but that's expensive to do.
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Old 22nd February 2018, 07:24 PM   #153
swank42 is offline swank42
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Thanks KaffiMann, I was trying to build on what you were saying.

In a practical sense, what is the current best sub $100 pre-built amp? My guess is it is a Class D. I'd also guess it is the TPA-series. I'd want to test that against other inexpensive amps though. I think this is a very interesting question. It is one the Class D forum is probably created to discuss.
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Old 24th February 2018, 06:50 PM   #154
jigglebones is offline jigglebones  United States
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Just replaced my LME49720NA in the FX502SPRO with the LME49720HA (metal can TO-99) version, cost 29$ off an american ebay vendor, vs 12$ for the regular DIP8. Was a little difficult to get wedged into the socket, and I'm still not 100% confident its secure, I may have to solder it in later (is this recommended?) My impressions: First of all, the LME49720 was a big improvement over the crappy NE5532 the amp ships with. As for the metal can version, initial impression is there is definitely a difference. highs seem clearer, however mids seem a bit more muffled/recessed. It does sound airier, maybe the highs sound so much better that the mids seem less. I do go after a more flat/detailed/natural profile and these LME49720 seems to be where its at for that sound. I would consider trying other opamps but most of the really good ones are SOIC only anyway.
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Old 25th February 2018, 07:29 AM   #155
chermann is offline chermann  Austria
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Originally Posted by jigglebones View Post
Just replaced my LME49720NA in the FX502SPRO with the LME49720HA (metal can TO-99) version, cost 29$ off an american ebay vendor, vs 12$ for the regular DIP8. Was a little difficult to get wedged into the socket, and I'm still not 100% confident its secure, I may have to solder it in later (is this recommended?) My impressions: First of all, the LME49720 was a big improvement over the crappy NE5532 the amp ships with. As for the metal can version, initial impression is there is definitely a difference. highs seem clearer, however mids seem a bit more muffled/recessed. It does sound airier, maybe the highs sound so much better that the mids seem less. I do go after a more flat/detailed/natural profile and these LME49720 seems to be where its at for that sound. I would consider trying other opamps but most of the really good ones are SOIC only anyway.
thx for your experence.

locked
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Old 25th February 2018, 11:18 AM   #156
bmiara is offline bmiara  Poland
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I own a pair of MA9 Monitor Audio speakers, 8 Ohms, recommended amplifier 10-60W. Which one should I buy: FX-AUDIO FX1002A or FX502SPRO? First is 80 USD, second 70 USD, so its not much a difference. I often listen very quietly, that I hear my clock ticking on the wall, so the new ampifier must run good at low volumes.
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Old 25th February 2018, 12:51 PM   #157
noasds is online now noasds
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May be someone compared what better LM4562NA or LME49720NA for FX502SPRO?
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Old 25th February 2018, 01:33 PM   #158
forestsgump is offline forestsgump
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Yep...thks for sharing the Op-amp for FX502SPRO...keep in view for next time Pre-stage upgrade.

Just wonder how does FX502SPRO compare to pure digital amp Alientek D8's STA326...
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Old 25th February 2018, 07:12 PM   #159
FauxFrench is offline FauxFrench  France
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Originally Posted by noasds View Post
May be someone compared what better LM4562NA or LME49720NA for FX502SPRO?
Rumors on other forums imply that it is the same chip with two different markings. Most (competent) audiophiles claim they cannot hear a clear difference.
So, I wouldn't worry about which one you can get your hands on.
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Old 25th February 2018, 08:09 PM   #160
DPH is offline DPH  United States
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It's not a rumor though. We're talking the same silicon in multiple different packages. The 4562 is the 49720. And the 49860 is the same chip, but binned for low leakage and rated for 44V rail-to-rail operation. That's it.

The metal package *might* have a bit better dissipation but what else? So, especially in a buffer situation feeding what is a pretty high impedance load (the input of the 3250), I cannot see what benefit you'd see swapping between the DIP8/SOIC8/TO99.
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