Fosi Audio V3 Mono Amplifier Review

[AdamG]

@AdamG Multiple Off topic posts deleted and 2 week thread bans issued as promised in post 1156 above.

Just FYI after 50-60 pages we lighten up on what is off topic. It’s your general thread drift. In product review threads we try to keep the early pages on topic so all the technical stuff is in the early sections. But when a thread like this ages we let more stuff go. It’s a balancing dance. We like to see active threads and conversations. This thread is at the point where we don’t police the conversation aggressively because that can have a negative effect on the dynamics of the conversation.

Appreciate the heads up though and I get your point. At some point we let the Members decide what they want to discuss.

 

[AdamG]

Just FYI after 50-60 pages we lighten up on what is off topic. It’s your general thread drift. In product review threads we try to keep the early pages on topic so all the technical stuff is in the early sections. But when a thread like this ages we let more stuff go. It’s a balancing dance. We like to see active threads and conversations. This thread is at the point where we don’t police the conversation aggressively because that can have a negative effect on the dynamics of the conversation.

Appreciate the heads up though and I get your point. At some point we let the Members decide what they want to discuss.

I do realize that was a lot of words when I could have said “Uncle” and this was my way of “Tapping out”. The Members win this round.

 

[MCH]

What i find amusing is that in the first days of TPA3255, boards, the main objective of the mod community was to bypass the opamps altogether and feed the chip directly with with a differential signal. People would claim all sorts of big improvements in sound quality

 

[FERCSA]

What i find amusing is that in the first days of TPA3255, boards, the main objective of the mod community was to bypass the opamps altogether and feed the chip directly with with a differential signal. People would claim all sorts of big improvements in sound quality

Hahh this is exactly what I'm doing. I don't say it is an improvement but my dac has only balanced outs. I was thinking to get the monos but why should I when I can simply add a balanced xlr pigtail to my v3?
CMRR get a small hit but the wire is very short and double shielded so doesnt matter.


In case someone needs it:
Pin1 +
Pin4 gnd
Pin7 -

 

[MCH]

Hahh this is exactly what I'm doing. I don't say it is an improvement but my dac has only balanced outs. I was thinking to get the monos but why should I when I can simply add a balanced xlr pigtail to my v3?
CMRR get a small hit but the wire is very short and double shielded so doesnt matter.

View attachment 371756
In case someone needs it:
Pin1 +
Pin4 gnd
Pin7 -

Yup, and I see the opamp socket comes super handy. That's a worthwhile easy mod

 

[Alex_Brouwer]

Try this? Or still go for the 2 5a?

 

[wybe]

Good questions, I am curios about this solution so I will take it. Worst case is have to buy an extra 10A brick.

 

[SMen]

Good questions, I am curios about this solution so I will take it. Worst case is have to buy an extra 10A brick.

And another filter (for worst case)

 

[SMen]

Try this? Or still go for the 2 5a? View attachment 371793

Still, it is a good gesture this. I wonder if @Fosi Audio measured the effect of the filter. The actual noise seemed quite low from memory from their post on this earlier in this thread.

 

[gasolin75]

 

[GGroch]

Any speculation as to the SP601 delay?

Untethered speculation is my superpower.

In a May 17 Kickstarter Update Fosi posted: "Help Shape the Sound of SP601" with the below graph attached.

Prototypes of the SP601 have been around for many months. I would think that if the speakers were shipping in June, the voicing would already have been decided. Certainly a delay to get this right makes sense.

Fosi's May 17 post reinforced my decision to postpone commitment. With no information on how the frequency graphs were measured, as well as the odd bass output, it would make it difficult for anyone to help them with voicing from a graph.

I believe Fosi has excellent in house amplifier engineers. Their attempt to crowdsouce frequency response with a graph makes me wonder if they have excellent speaker/acoustics engineers. I hope they will make an SP601 specific Kickstarter when the speakers are ready. Perhaps they could send prototypes to Amir or Erin for feedback before the final design is set.

 

[Negatywny]

"All backers who have chosen the 48V10A power supply + 2 sets of V3 Mono Combo will receive our custom-designed power filter for free!"

lol, want this slick power brick instead of two power bricks, to save space? Great, have this power brick and this free power filter xD

 

[rvsixer]

simple audio - one tone, complex audio - multiple tones...?

Their idea of complex audio was stated in the FAQ. I've been waiting for a Fosi explanation of just how the 10A power supply improves over the 5A for "...handling dynamically complex audio signals...", before the Kickstarter ends in a few hours.

At the price of three of these for LCR with the 10A supplies ($171/ch), you are not that far away from just getting a 4ch Buckeye Hypex based big boy amp (lol Erin love that term) all in one chassis with one power cord ($231/ch). And have a spare channel as backup.

 

[Kimbrough Xu]

Their idea of complex audio was stated in the FAQ. I've been waiting for a Fosi explanation of just how the 10A power supply improves over the 5A for "...handling dynamically complex audio signals...", before the Kickstarter ends in a few hours.

At the price of three of these for LCR with the 10A supplies ($171/ch), you are not that far away from just getting a 4ch Buckeye Hypex based big boy amp (lol Erin love that term) all in one chassis with one power cord ($231/ch). And have a spare channel as backup.

Just get a 3 channel amplifier, why do you need the backup spare channel?

 

[Lednek]

Just get a 3 channel amplifier, why do you need the backup spare channel?

Because the Hyoex Nc252 modules would be the closest in price point. They are stereo modules. It would be a pretty good step up in price to go with three single channel modules.

 

[rvsixer]

Just get a 3 channel amplifier, why do you need the backup spare channel?

Because the idea is to spend less, not more (both upfront cost, and repair/replacement cost should a failure occur). And the 3-channel amps are not comparable price/performance/power wise to either the Fosi or the referenced Hypex stereo modules amps.

 

[Sokel]

big boy amp (lol Erin love that term)

Erin got some nice comments about real big boy amps,unlike the ones he uses

 

[Jon L]

Because the Hyoex Nc252 modules would be the closest in price point. They are stereo modules. It would be a pretty good step up in price to go with three single channel modules.

There are always the Dartzeel clones

 

[SMen]

just came across this.

 

[rvsixer]

just came across this.

Ugh. Painful subjective fluffery. I'll take the two pieces of cake though .