A Mod That Actually Works (Fosi V3 Monoblock Amplifier)

[jmdesignz2]

$26-28 to modify both channels

Saw a mention of these on another thread and bought them

Installed this morning and already have a guaranteed performance benefit

The amps are cool to the touch vs being “Coffee cup hot” previously

No detected extra noise from 2 feet away

They don’t look as terrible as I thought although could be dressed up with some fancy panels or wrap maybe

The lowest setting is good enough

120x120mm size, usb powered

 

[SnakeLord]

Made my day!

Its funny to see a tiny, simple and efficient desktop/living room device being pierced by some barely fitting high voltage power line cables (is that even legal?).
Why not just placing it into refrigerator for some really audiophile grade HQ sound?

The "Audiophile" community never stops to deliver and amaze. Keep the good job up

 

[Bleib]

When I owned the amps I used thermaltape and placed two heatsinks at the bottom, keeping the cooling passive. Sometimes it's reportered that fans can interfere electrically so I wouldn't take that risk

 

[jmdesignz2]

Made my day!

Its funny to see a tiny, simple and efficient desktop/living room device being pierced by some barely fitting high voltage power line cables (is that even legal?).
Why not just placing it into refrigerator for some really audiophile grade HQ sound?

The "Audiophile" community never stops to deliver and amaze. Keep the good job up

Sorry what are you referring to?

 

[jmdesignz2]

When I owned the amps I used thermaltape and placed two heatsinks at the bottom, keeping the cooling passive. Sometimes it's reportered that fans can interfere electrically so I wouldn't take that risk

I was apprehensive of that but I've heard zero interference with these fans

 

[Bruce Morgen]

My two elderly Aiyima A07s -- notorious for their inadequate cooling from the getgo -- have been running on 48 volts for well over four years pretty much 24/7 with nary a hint of overheating, let alone any thermal shutdowns. They're powered by a 10 amp industrial SMPS with its cooling fan disabled -- and there have been zero issues with that unit either.

I can't imagine there'd ever be any functionally relevant thermal woes with a more sophisticated and obviously well ventilated product like that Fosi -- but then again, what do I know?

 

[Bleib]

I can't imagine there'd ever be any functionally relevant thermal woes with a more sophisticated and obviously well ventilated product like that Fosi -- but then again, what do I know?

Had I kept them I would likely have used for more than a decade. Most of the time the thermals likely will be OK, but during summer.. might be a bit too much

 

[Gary_G]

Why not just placing it into refrigerator for some really audiophile grade HQ sound?

Awesomeness there! Audiophile cooling options.

 

[KurtKlötentreter]

I grabbed a pair of these recently during black friday and noticed that one of the two got hot faster and also hotter in general than the other one. I didn't want to use active cooling tho, so instead I opened up both amps, added a generous amount of thermal compound on top of the existing one, and added a slim heatsink to the underside of each amp. Had to add some taller feet as well, but the result looks basically stock unless you go down low enough to see the feet and heatsinks.

 

[jmdesignz2]

I grabbed a pair of these recently during black friday and noticed that one of the two got hot faster and also hotter in general than the other one. I didn't want to use active cooling tho, so instead I opened up both amps, added a generous amount of thermal compound on top of the existing one, and added a slim heatsink to the underside of each amp. Had to add some taller feet as well, but the result looks basically stock unless you go down low enough to see the feet and heatsinks.View attachment 502431View attachment 502432

Very nice- how much cooler does that run and what heat sink did you purchase (link? or detailed description)

 

[KurtKlötentreter]

Very nice- how much cooler does that run and what heat sink did you purchase (link? or detailed description)

Have to be honest, I didn't think to pull out the IR thermometer we have before doing the mod so I can't provide definitive data.
I just remember that before doing the mod, especially the bottoms were getting "warmer than I'd have expected" for a class D amp, tho definitely not got enough to burn my hand or be uncomfortable to touch. Main motivation was the difference in max temperature and the heat up time between the two amps, as it gave me a clear impression that one of the two was dissipating better than the other.

The heatsink was this one:

https://a.aliexpress.com/_EIwj2dE

And the feet I put under the amps were these, specifically the 16x8mm variant:

https://a.aliexpress.com/_EHcpxlW

 

[EngineerNate]

Made my day!

Its funny to see a tiny, simple and efficient desktop/living room device being pierced by some barely fitting high voltage power line cables (is that even legal?).
Why not just placing it into refrigerator for some really audiophile grade HQ sound?

The "Audiophile" community never stops to deliver and amaze. Keep the good job up

Pretty sure those are his speaker wires.