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Fosi Audio BT20A Pro Amplifier Review
- Thread starter amirm
- Start date
potfur
Member
Yes, it is definitely there.
I presume yours is with the stock NE5532P DIP8 op amps?
potfur
Member
Yes, everything stock, with the 32V power supply. The flapping is only evident when I move my ear quite close to the tweeter (but it is there).
I have to put my ear an inch to the tweeter to even hear it, so its not really a problem.
I tried the 32V and 48V stock PSU, and swapped the NE5532Ps for OPA2134PAs, all of those made no difference to that flapping.
I had a similar problem with a different but similar class D amp - it turned out to be the plug and not being correctly grounded.
potfur
Member
The FOSI PSU has a two-pronged plug, so the amp is not really designed to be grounded via the PSU.
OK well as I said it was a similar noise problem but a different amplifier / manufacturer - I haven't had any problems with my BT20A Pro using the stock PSU.
If you don't care about bluetooth and you don't mind the linear potentiometer of the tb10d, you're good to go
Kimbrough Xu
Active Member
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- May 18, 2022
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Seems fosi audio V3 is more suitable for you.
Fosi Audio V3
Using a minimalist design language, focusing more on enhancing the sound quality and performance of the product, making it the best-sounding power amplifier of Fosi Audio to date.
To be honest, i don't see it as an upgrade.
An upgrade would be a NC252MP module based amplifier, or maybe a class AB (Yamaha, Rotel, Nad, Denon and so on).
What are the differences with the bt20a potentiometer? In terms of sound, I mean
None, it's just a question of "feel" or ease of control. doesn't matter in terms of sound quality.
The only "problem" are the treble. I find them fatiguing with Elac Debut Reference listening rock... Even with the A07. Very clean but harsh
No difference in terms of sound. Simply the linear potentiometer of the tb10d brings the volume to very high levels very quickly, furthermore the minimum volume in which both channels play at the same volume is high enough, so as not to be able to listen to low volume background music.
The logarithmic potentiometer of the BT20a pro is logarithmic, the volume increase is initially much more gradual and allows listening at low volume without particular difficulties
Cheap class D amps tend to be unstable with certain loads, and that sometimes manifests itself in overly prominent highs. My A07 sounds fine with my ATC SCM19v2, but not so good with my Mission LX-.3 MKII.
If you get an opportunity, borrow a class AB amp from friends or buy one. You may find that they sound a lot better with your particular load.
A friend of mine in the US got a Yamaha R-S700 for $120 recently, he said his speakers sounded different to him now, more bass, more body, less harsh. It's a very solid amp, even at $200. If you are in Europe, 160€ to 220€ is realistic for the R-S700.
If you are interested in AB amps, we have a thread called "Inside Yamaha amps" where you can look inside them. Denon, Marantz, Rotel and other AB amp manufacturers look very much the same.
Eggs Ackley
Active Member
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- Sep 20, 2021
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I got one on Amazon for around ten dollars. It seems fine.
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