Interesting review. I also find most of Fosi audio stuff to be good but not worth writing home about. There's something just "not quite right" about their design work. I've delved into the their TB10D to the level of doing a design critique and found a few things they can do better ... most pronouncedly keeping the output filter coils away from the big chip's heatsink. They tend to interact rather noticeably. Modifying the heat sink to create some clearance got rid of that NQR sound problem. Other mods brought out the better in the amp. Resulting in far better sound. Another shortcoming is the use of NE5532 op-amps. Not the best choice, but dirt cheap and readily available. On amps that allow chip flipping, I generally sub in RC4558 or TL072 chips with much better results. (the replacements are less than a dollar each) I haven't done a deep dive with the BT20A Pro, and don't plan to. But you should know that the TPA3255 chip, when properly implemented is capable of sound that will rival almost any decent stereo amplifier. Other than these small mini-amps you will find this chip in studio monitors, AV amplifiers, PA Amplifiers and even a few mid-range HiFi amps. Volume match them, do an AB test and you would be unable to tell which is playing. The key phrase here is "When Properly Implemented" which many of these mini-amps do not do. Do a side by side with an Aiyima A07 (original design) ... you'll get the idea.

Good channel, I like your real-world non-techie-speak approach. You should reach out to A British Audiophile, he might be your long-lost brother.

@0102studio

Ай бұрын

Lol amazing, I’ll check him out!

Ok, so this might not be a fair comparison but I have a recapped NAD 3020 and a Fosi TB10D, which is close enough to look at the points you are making I think. When my NAD came back from its major service, which after 45 years it really needed, I swapped it out for the TB10 I had bought to tide me over in that particular set up. Small room, old KEF Q1 speakers, just a near field decent but not mind blowing sound. Now then, the first thing I noticed was the FOSI had a very noticeable wider sound stage, there was much more, I guess people call it instrument separation on the FOSI, the sound was of course more "clinical" but actually I felt it was a much more "technical sound". I have the TV and old S10plus connected to a SML D200 headphone/DAC and swapped the NAD out again and put the FOSI back. I have now swapped them back again after a week to see what I think. I guess my point is, the sound from the FOSI is far from terrible, in fact in many ways, its pretty decent and when you consider the price, well its very decent. Forget the figures on Wattage, meaningless, though it does go bloody loud. I shall see how I feel after a week of the NAD being back in place. What I would say though is for the TV, the FOSI is better by a very decent margin, its sound stage and separation is much better suited to TV, IMO of course. Have a great day.

@0102studio

Ай бұрын

I love this. Everyone has a different perspective and experience. I don’t think the Fosi is terrible, for around a hundred bucks, its pretty good.

@ggproductions7078

Ай бұрын

@@0102studio hey, by the way, "not terrible" is slang over here for it being fair, if not exactly stellar!

Sabaj A10 same price but way better sound on sale for 97.91 on hifi express...even at 136.00 it punches way above it's price...review it

@0102studio

Ай бұрын

Colour me curious!

I've been using the BT20A Pro with a pair of Klipsch b20 bookshelf speakers and I think it sounds pretty decent for what it is.

@0102studio

Ай бұрын

For what it is, and for the price there’s not much to complain about.

By the way ... Small Amp does not mean Small Speakers. Get almost any TPA3255 based amp hooked up to some decent floor standers -- Pioneer, Heresy or L-100 -- and you're in for a real treat.

@0102studio

14 күн бұрын

Yeah, since they left amp here with me I do plan to go back to it at some point. But since I won’t be cracking it open or modding it in anyway I imagine the sound will still be so-so.

@Douglas_Blake_579

14 күн бұрын

@@0102studio Give it a fair chance... 50 watts per channel is not to be sniffed at.

@0102studio

14 күн бұрын

@@Douglas_Blake_579 its not the 50 watts. I have and love a few 50 watt amps.

@Douglas_Blake_579

14 күн бұрын

@@0102studio 50 watts is more than enough power for most people ... on the right speakers it can get right freaking loud. In fact most reasonable listening occurs at 2 and 3 watt levels with the rest being used for transients and peaks. My point was that the TPA3255 mini-amps I've worked with all seem a little anemic on lollipop speakers and do much better on the towers. For example: I'm using an Aiyima A07 in my main system on a 36 volt supply. This gives me about 75 watts of power. On my desktop speakers it's kinda "meh" but when I let it loose on my Pioneer towers it's like "Holy Crap" good.

You chose the wrong model i guess. Looking at how fast these small things are evolving, you have to buy the latest model, anything else is completely outdated. Other than 3255 units Some others like loxjie a40 and sabaj a30a (this one is a digital amp) are great options! (a bit more pricey but with a lot more features)

@0102studio

Ай бұрын

Fosi sent this one, so I imagine its the latest.

@JoseFerreira-zb7wh

Ай бұрын

@@0102studio nope. 😀

@AR-vf7vg

Ай бұрын

​@@0102studiotssssss

@dannyheaton1

Ай бұрын

Great review , thank you. I really enjoy your approach and straight forward manner. Of all the reviewers out there I listen to just 4 , you being one of them . Cheers !

@0102studio

Ай бұрын

@@dannyheaton1 thank you so much, its much appreciated!