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Fosi Audio V3 Amplifier Review

Rate this amplifier:

  • 1. Poor (headless panther)

    Votes: 11 2.4%
  • 2. Not terrible (postman panther)

    Votes: 40 8.7%
  • 3. Fine (happy panther)

    Votes: 222 48.2%
  • 4. Great (golfing panther)

    Votes: 188 40.8%

  • Total voters
    461
I've had my Fosi up and running for about a month and am quite pleased with it's performance. This morning I inadvertently managed to spill a couple tablespoons of hot coffee through it's vents while it was running. The little Fosi shut down instantly and I feared the worst outcome. I turned the amp off and dried the outside with a towel and used a can of compressed air to blow out the coffee that was left inside. To my complete amazement the hardy little Fosi sprung back to life and has been playing a couple hours now with no sign of a problem.
Kudos to Fosi Audio for going above and beyond and including a highly functional spilled coffee safety device on the V3.

By all means, everyone should spill coffee on their Fosi amp to test this feature. :cool:
 
High end coffee ... you'll listen a more open soundstage like taking off a veil on the speakers
 
Apparently I spoke too soon about the little Fosi not suffering any damage from the spilt coffee. Late last night after running all day it began to make static noises and then nothing. Today I'll take the cover off and clean things up with a qtip and ip. I'm thinking pull the op amp and clean the legs and reinsert. If that doesn't work it'll be $65 for a replacement unit. Lesson learned.
 
A follow up to my spilled coffee mishap. I just finished the reassembly after a good cleaning and it's a no go. The blue light comes on and I can hear a protection circuit click when the volume knob is close to being shut off but no music. Nothing looked out of the ordinary and I couldn't even find a coffee stain. I'm thinking no more than a half teaspoon found it's way to the board but sadly it was enough to ruin it..
 
A follow up to my spilled coffee mishap. I just finished the reassembly after a good cleaning and it's a no go. The blue light comes on and I can hear a protection circuit click when the volume knob is close to being shut off but no music. Nothing looked out of the ordinary and I couldn't even find a coffee stain. I'm thinking no more than a half teaspoon found it's way to the board but sadly it was enough to ruin it..
Worth trying hair dryer heat up for 10-15 min.
 
Worth trying hair dryer heat up for 10-15 min.
Dried up residue might still be the problem. Before giving up I'd give it a bit of time to make sure all capacitors discharged, thoroughly wash/bath the amp in distilled water, leave it to dry in a warm airing cupboard or warm place for at least 48 hours then give it another try.

You can of course also user 'proper' cleaners but it's a cheap amp to replace :)
 
I would check the regulators, if you get 15V, 12V and I guess 3.3V (I am guessing the values based on similar amps). If not, you might be able to replace the one failing. If yes, might be dead chip or other dead IC...
 
The V3 is on sale again, so I checked Amazon to see what their user reviews look like. Wow. Lots of comments about unusably low volume, murky sound, 1 and 2 star reviews. Strange for something that measured so well in testing. What gives? Have Fosi been selling thousands of these, so the bad reviews are just the tiny number of defectives shipped out? Or is their QC not so hot?

 
The V3 is on sale again, so I checked Amazon to see what their user reviews look like. Wow. Lots of comments about unusably low volume, murky sound, 1 and 2 star reviews. Strange for something that measured so well in testing. What gives? Have Fosi been selling thousands of these, so the bad reviews are just the tiny number of defectives shipped out? Or is their QC not so hot?

628 global ratings on Amazon -> 94% ratings are 3,4,5 stars -> 2% are 2's & 4% are 1's -> guess I interpret the results different...:facepalm:o_O
 
Many of those complaining about "low volume" probably need to be pointed to the start of this thread... to understand that the volume pot is using a logarithmic scale. I have 4 x Fosi Audio V3 and all have been working flawlessly... knock on wood.
 
The V3 is on sale again, so I checked Amazon to see what their user reviews look like. Wow. Lots of comments about unusably low volume, murky sound, 1 and 2 star reviews. Strange for something that measured so well in testing. What gives? Have Fosi been selling thousands of these, so the bad reviews are just the tiny number of defectives shipped out? Or is their QC not so hot?

I think these review articles are the result of ignorance of Chinese products and a lack of technical knowledge. The contents of the reviews are all things I already know and I have no problem with them. However, Fosi should change the expression "PREOUT". It confuses buyers.
As for QC, there are many problems from the perspective of our society. However, these are products of a country whose social system is completely different from ours. Therefore, it is difficult to directly apply our common sense to them. You need to fully understand this before purchasing.
 
The V3's a fine little amp, mine is still working fine, though I have tended to grab the Aiyima A07 Max more of late when using a small amp...
 
I think these review articles are the result of ignorance of Chinese products and a lack of technical knowledge. The contents of the reviews are all things I already know and I have no problem with them. However, Fosi should change the expression "PREOUT". It confuses buyers.
As for QC, there are many problems from the perspective of our society. However, these are products of a country whose social system is completely different from ours. Therefore, it is difficult to directly apply our common sense to them. You need to fully understand this before purchasing.
Many simply compare it against there old gear and then not finding those advertised power output becomes a concern for a common user.
I have personally recommended these amps to my known ones and a few have simply said the same thing that it isn’t powerful as they say.
 
Many of those complaining about "low volume" probably need to be pointed to the start of this thread... to understand that the volume pot is using a logarithmic scale. I have 4 x Fosi Audio V3 and all have been working flawlessly... knock on wood.
All volume controls use a logarithmic ('audio') taper. Even way back in the days of mono 78s, manufacturers knew that log taper pots were more intuitive to use, more adjustability at lower to medium volume, rather than sounding like the amp's playing nearly full blast with the vol ctrl turned less than half way up.

People also don't understand what 'gain' means. What is the gain (in decibels) of the V3? At what input signal voltage does the amp reach full power?

Good to hear your Fosi V3 amps are working well.
 
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All volume controls use a logarithmic ('audio') taper. Even way back in the days of mono 78s, manufacturers knew that log taper pots were more intuitive to use, more adjustability at lower to medium volume, rather than sounding like the amp's playing nearly full blast with the vol ctrl turned less than half way up.

People also don't understand what 'gain' means. What is the gain (in decibels) of the V3? At what input signal voltage does the amp reach full power?

Good to hear your Fosi V3 amps are working well.

My V3s powering the left, right, and center (bi-amped) channels are set to max when listening to audio (stereo) and/or watching movies (5.2.4 ATMOS). I set the gains on all the speakers/amps on the audio video processor using good old pink noise. Yep I know all about room correction... I have tried them (Audyssey, WiiM Pro's Room Correction on the latest firmware update), but I found setting up the gains using good old pink noise was giving me the best result.
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