Fosi Audio BT20A Pro Amplifier Review

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0102 Studio

Күн бұрын

Пікірлер: 28

@sudipdutt9699 27 күн бұрын

@TSME , Calcutta?

@Gadgetdad007 Ай бұрын

The only downside to using this amp is that the Bluetooth can be intercepted, especially if you’re using RCA input and you have it on a loud volume and then someone intercepts your Bluetooth it could mean disaster for your speakers. 😮

@0102studio Ай бұрын

Oh no! I have a friend that listens to death metal and intercepts all the time. That would be awful.

@Douglas_Blake_579 2 ай бұрын

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.

@ggproductions7078 3 ай бұрын

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 3 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 3 ай бұрын

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

@ggproductions7078 4 күн бұрын

So, after quite a while, I feel the major difference is the NAD's deeper front-to-back and thicker (warmer) sound. Of course, it's old and would be smashed by more modern IAmps, but for music, it is more enjoyable than the Fosi. I repeat my original comment for the TV, the Fosi and its wider, but shallower sound stage take it. Just for fun, I have connected a Do200pro to the NAD and through its preamp stage, to the new V3 monoblocks and it weirdly works. Given how often they push out new products I reckon you can get the TB10 for hardly anything now and for a small set-up, it's still totally fine.

@0102studio 4 күн бұрын

@@ggproductions7078 I used the NAD as a preamp into the Rotel 1582 mkii, and was great. So long as I decided to not nitpick! 😂

@ggproductions7078 4 күн бұрын

@@0102studio yes, you are very right about the nitpicking. Of course they have "less detail" and "separation" whatever that is supposed to mean ( not a shock as it wasn't super expensive back in the old un days) but it just sounds nice, the class Ds as a power amp give a little of the staging and separation back, which was what I was hoping for. I just hooked up a Ifi Zen streamer in there (with the power X, replacing the iPower 1 that came with it and yes, it does make a difference, which shocked me it has to be said) and it plays really nice with the NAD too. The lesson from all of this is if you have even an old Intergrated lying around, and it is quite decent, you can mix and much for the best of both worlds, don't just throw them away.

@silkhead44 3 ай бұрын

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 3 ай бұрын

Colour me curious!

@JoseFerreira-zb7wh 3 ай бұрын

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 3 ай бұрын

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

@JoseFerreira-zb7wh 3 ай бұрын

@@0102studio nope. 😀

@AR-vf7vg 3 ай бұрын

@@0102studiotssssss

@dannyheaton1 2 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 2 ай бұрын

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

@Douglas_Blake_579 2 ай бұрын

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 2 ай 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 2 ай бұрын

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

@0102studio 2 ай бұрын

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

@Douglas_Blake_579 2 ай 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.