Fosi Audio BT20A Pro Amplifier Review

[sbronf]

Thank you. My wiim amp pro is perfectly balanced also at very low volume. Maybe because it has digital volume control and not a potentiometer?

 

[staticV3]

Maybe because it has digital volume control and not a potentiometer?

Precisely because of this reason.

 

[SJN]

Just got mine yesterday to replace an inexpensive Douk Audio Nobsound 1002P. And hmmmmm Im disappointed. The 1002P sounds richer more live than the BT20A Pro. The Fosi just sounds a bit flat for my kind of music. I tried swapping them over 50 times to compare, and no matter where the tone knobs are on the fosi the 1002P just sounds better. Using it with my computer with a SMSL SU-1 DAC and B&W 685 V1 speakers.

 

[SJN]

Anyone know how to disable the bluetooth on it ? I live in an apartment building, and some neighbours are connecting/pairing to my amp and playing their music......pretty anoying I dont even have the antenna installed, but it still picks up their phones aparently.

 

[alvigg]

Usually to pair there is a confirmation command on the device. Does the amp bypass that?

 

[Grenadine]

Anyone know how to disable the bluetooth on it ? I live in an apartment building, and some neighbours are connecting/pairing to my amp and playing their music......pretty anoying I dont even have the antenna installed, but it still picks up their phones aparently.

Made me laugh but I can understand your frustration

 

[Jimi Floyd]

Maybe you can short the antenna input?

 

[SJN]

Anyone in range can pair to the Amp I opened it up, and pulled the little wire going from the board to the antenna socket in hope that it would reduce the range, but it is still about 4-5 meters....and that is enough for someone to connect if they are out in the stair case, or above or below my apartment. Will have to talk to my neighbours if next time it happens. It auto connects when they are close by. I have long pressed the volume button, to delete the pair. Will see if they try to connect again. Pretty sure they do it by mistake, as I can hear their phone conversations, and music blasting through my speakers. Its in arabic, so I unfortunatly dont understand You think shorting the antenna is ok ?

 

[Jimi Floyd]

Yes, first thing I would try is connect to any ground inside the box the wire you pulled from the antenna socket.

 

[AudioSceptic]

Anyone in range can pair to the Amp I opened it up, and pulled the little wire going from the board to the antenna socket in hope that it would reduce the range, but it is still about 4-5 meters....and that is enough for someone to connect if they are out in the stair case, or above or below my apartment. Will have to talk to my neighbours if next time it happens. It auto connects when they are close by. I have long pressed the volume button, to delete the pair. Will see if they try to connect again. Pretty sure they do it by mistake, as I can hear their phone conversations, and music blasting through my speakers. Its in arabic, so I unfortunatly dont understand You think shorting the antenna is ok ?

Just an idea but do you know if the Fosi allows Multipoint pairing? BlueTooth pairing usually means that only one device can be paired at a time, so if you pair the Fosi with one of your phones/whatever, others cannot then pair with it, unless it allows Multipoint.

 

[motleypixel]

@amirm in your OP you have a fantastic graphics/graph rating all of your reviews Class D amps. Where would you put the BT30D Pro in this line-up? I see there's another forum user @Pixelwarefare that has a review of the 30D Pro but again, it's not placed in the line-up. Thank you.

 

[pahks pahchem]

The comparison with the tube amp at the end.... brutal. The class D amp sounded like someone squeezed Nora's throat with both hands and forced her to sing at the gunpoint. Ouch.

lol! nevertheless,i am and have been having contented and fulfilling times with class d, several, and a 3e a5se just landed a couple days ago too. this after decades literally, since 1989, happily powered by sansui sx-900. dad had leaks with goodman speakers and a collaro turntable at home in akl nz during the 1960s, come to think of it...adiós

 

[rokr]

Just ordered one for 53$ (no power adapter) from the official Fosi Audio store (AliExpress).

https://a.aliexpress.com/_c4bv2Qbr

 

[Discokatt]

Hi everyone!

Does anyone know if this amp supports 3Ohm speakers (currently have 32V 5A power supply, but can upgrade if not good enough)? (Specifically the Ground Zero GZRF 6.5SQ / JBL Club 64 car speakers)

For context, I saw the power output video review which shows the amp does not like 2Ohm loads.

 

[gasolin75]

Fosi Audio BT20A MAX is out for sale

48V/5a power supply 258 euro https://fosiaudio.com/pages/bt20a-m...0-5u6Gp2jOLbPBUT-xS_AGxwARNBIc9pybiYY_ktw7HQj

 

[Totemis]

280 dollars ! c'est trop... le prix a triplé en 2 ans ...

 

[Joe Smith]

Fosi Audio BT20A MAX is out for sale

48V/5a power supply 258 euro


View attachment 503010

I'm seeing a substantially lower price, at least in the U.S., with their initial 20% discount code applied...and there is the choice of three different power brick options, which can influence the price. But not sure if that factors in tariffs.

Totemis, per your comment, keep in mind this is a substantially different model than the previous Model 20 iterations, substantially better performance and many more features. They seem to have packed a fair number of new features in, as this is "their first stereo amp with PFFB."

 

[gasolin75]

Not alot different if a wiim amp pro didn't have streaming only bt

BUT why a laptop power supply ? Why not inside of the amp like wiim amps ?

 

[Joe Smith]

Not alot different if a wiim amp pro didn't have streaming only bt

BUT why a laptop power supply ? Why not inside of the amp like wiim amps ?

Yeah, I like my SMSL AO100 because it does have an internal power board, makes it a nice compact unit.

But I think Fosi's philosophy for the most part is to separate the amp and the power supply so people can a) match purchased power brick to their power level needs, b) replace as needed, c) generate less heat inside the case. Valid issues.

 

[Bleib]

Not alot different if a wiim amp pro didn't have streaming only bt

BUT why a laptop power supply ? Why not inside of the amp like wiim amps ?

It cuts down costs quite a bit to have it seperate