Fosi Audio V3 Mono Amplifier Review

[olieb]

Honestly, I have never ever run into any of these problems running premade cables with swappable ends and just using the banana plug option. They’re tight enough, they go in fine, they don’t budge, and they sound fine.

-Ed

I use these with slat springs for everything that does not have Speakon.

 

[Doodski]

Honestly, I have never ever run into any of these problems running premade cables with swappable ends and just using the banana plug option. They’re tight enough, they go in fine, they don’t budge, and they sound fine.

-Ed

I have used banana extensively with instrumentation and they are notorious for poor connections that result in erroneous metering.

 

[Deleted member 72219]

I have used banana extensively with instrumentation and they are notorious for poor connections that result in erroneous metering.

Do spades perform better in this respect?

 

[Doodski]

Do spades perform better in this respect?

I never used spades for instrumentation metering so I never got to see if the connections where poor or not. A tight screwed down spade should be good though.

 

[Zek]

Do spades perform better in this respect?

I mean, yes, but occasionally the speaker terminals need to be tightened because they loosen over time from vibrations.

 

[Deleted member 72219]

I have perfectly good cables that I bought with threaded ends that take my choice of screw-on spades or screw-on banana plugs. I won’t just put aside good cables to try and switch to bare wire.

-Ed

 

[Hunter Mike]

I use these with slat springs for everything that does not have Speakon.

I make my own terminations with these. Some assembly required but they’re copper and stubby. Tight fit. Just add some 3:1 heat shrink with adhesive and it’s a solid low-profile connector. Fits my 12ga wire.

 

[Guddu]

The 2Ω output that Amir measured is 100W short of the TPA3255's specs:

New Fosi Audio V3 Mono vs Topping PA5 II vs Topping PA7 (inc. 'Plus' versions)...and Aiyima A70

I am curious which voltage regulator will be inside the Fosi V3 Mono. I noticed that the late Michael Beeny had suggested that some of the earlier TPA3255 burn pile might have been generated from not using something capable. His example of capable is...

www.audiosciencereview.com

Isn't it likely that a 10A supply would get the V3 Mono closer to spec?

I wish if I could tell anything about 2ohm load output capabilities, but don’t see any point in getting too much into theory myself for this.
Most the speakers dip down around 4ohm, and I see no reason to jump from 48v 5a to 10a for such a speaker.
After all, people but 350w amplifier even though they only use 50w generally in practice, those who can.
So why not 10a psu!

PE. And even if it can run amp to its limits, I won’t dream of doing that myself, and so I won’t advertise anyone else as well.

 

[Guddu]

I make my own terminations with these. Some assembly required but they’re copper and stubby. Tight fit. Just add some 3:1 heat shrink with adhesive and it’s a solid low-profile connector. Fits my 12ga wire.
View attachment 363573
View attachment 363574

I have seen these used in Best Buy Magnolia near me, never thought these are this much cheap….. Good deal.

 

[TheBatsEar]

The 2Ω output that Amir measured is 100W short of the TPA3255's specs:

With or without PFFB?
At what voltage?

 

[staticV3]

With or without PFFB?
At what voltage?

PFFB On or Off is not a specified condition for the graph in TI's datasheet.

As for the supply voltage, just take a look at the graph in my link.

 

[Sig.Rossi]

Yamaha A-S301 or any other regular amp. Same price region too.

Unfortunately this is too big. I need something small.

Therefore I would also like to avoid additional devices to produce volume control/balance.

Any other ideas?

 

[Basilderat]

I use these with 12awg speaker cable and find them excellent, easy to use, tight fit, gold plated and look good:

Server Busy

 

[Deleted member 72219]

Unfortunately this is too big. I need something small.

Therefore I would also like to avoid additional devices to produce volume control/balance.

Any other ideas?

Douk H7 is probably the closest thing to what you want since it has separate volumes for left and right channels. They are releasing a Douk H7 Pro model that is an improvement on the original H7, also.

Douk Audio H7PRO TPA3255 Digital Amplifier w/VU Meter 300W Home Stereo Power Amp

Introduction H7PRO is a mini digital amplifier designed by Douk Audio, combining a compact design with exceptional performance. Adopting a TPA3255 amp chip, the power output up to 300W for each channel can effortlessly drive 4-8Ω speakers, delivering impressive sound quality. With single-ended...

doukaudio.com

-Ed

 

[Deleted member 72219]

TPA3255 PBTL Mono won't gain anything (significant or useful) from 48v 5a to 10a, no benefit.

@Fosi Audio Its a good idea to add a table or chart on your Fosi v3 mono product page with output power on different PSU options.

Obviously not the same amplifier, but interestingly enough, the Douk H7 Pro, which is a stereo amplifier also based on the same Texas Instruments chip (so similar to, say, the Fosi ZA3 with stereo VUs in place of a mono mode and full spectrum stereo RCA outputs in place of a filtered subwoofer output), and it shows a power increase going 48V 10A versus 48V 5A:

 

[mcdn]

PFFB On or Off is not a specified condition for the graph in TI's datasheet.

As for the supply voltage, just take a look at the graph in my link.

The graphs are with it off. The amplifiers gain is reduced by the amount of feedback used, but total power will depend on the input buffer gain

 

[Guddu]

Obviously not the same amplifier, but interestingly enough, the Douk H7 Pro, which is a stereo amplifier also based on the same Texas Instruments chip (so similar to, say, the Fosi ZA3 with stereo VUs in place of a mono mode and full spectrum stereo RCA outputs in place of a filtered subwoofer output), and it shows a power increase going 48V 10A versus 48V 5A:View attachment 363617

Seems like you are confusing stereo output power to PBTL mono power output.
Try to find a similar table for PBTL/mono amplifier to see what difference does it make potentially.

This is the reason why PFFB Stereo implementation is practically more beneficial compared to mono implementation for use in general for TPA3255 based topologies.

 

[MCH]

This is the reason why PFFB Stereo implementation is practically more beneficial compared to mono implementation for use in general for TPA3255 based topologies.

If you are going to be using the amps to the limit of their power, thermal behaviour is going to become very relevant, and in this scenario mono implementation has an important advantage, for obvious reasons.

 

[Guddu]

If you are going to be using the amps to the limit of their power, thermal behaviour is going to become very relevant, and in this scenario mono implementation has an important advantage, for obvious reasons.

Agreed.
But my statement wasn’t in relation to thermal performance, I am not in favor of in use of these chip amplifiers to their limits anyway.

 

[Hunter Mike]

I use these with 12awg speaker cable and find them excellent, easy to use, tight fit, gold plated and look good:

Server Busy

I thought about those then read many reviews of how the Nakamichi brand name is just used to peddle good just like so many of the good ‘ole brands. Private investment firms milk the name for more profit.

I used to use Mediabridge bananas, then I stuck a magnet to them one day…all pot metal.