Fosi Audio V3 Amplifier Review

[Schlippwhip68]

Yes, I am enjoying Class D quite a lot more recently.

 

[saberger0357]

Yes, I am enjoying Class D quite a lot more recently.

Me too!

Are there any trustworthy power measurements available for the original 04 amp?

 

[Freezak]

Which bookshelf speakers close in price to ELAC Debut B6.2 would be the best for this amplifier? I'll be pairing it with S.M.S.L SU-1 DAC. I live in an apartment too, subwoofer is not an option - so preferably i'd like something with a not-so-bad bass extension, something also that's the best as an all-rounder, as they'd be used for music, movies and sometimes games as well. I prefer neutral, HD560s-like sound signature but obviously it's not a necessity, as rooms and room treatment options are not always the same in every case. Thanks!

 

[Schlippwhip68]

Me too!

Are there any trustworthy power measurements available for the original 04 amp?

If you search the amplifier review forum for the A04 you might find something there..

 

[saberger0357]

Nothing as official as Amir's ratings but I'm seeing about 140 watts at 4 ohms, 80 at 8 with the 36V PSU.

 

[T&T]

I have one Aiyima 04 Black board, with manufacturer upgrades for sale at eBay...too many amps...the 04 was made and tuned for NE5532 opamp, I tried several opamp and nothing sounds better.
Aiyima 04 was built with 2 board, one was blue (cheap) and one black board with upgrade water filter with two 3000uf filters up to 6000uf; use red ring inductor, LC filter network with S-iemens capacitor, E-LNA red robe audio capacitor, T-K Audio series coupling capacitor.

 

[Schlippwhip68]

I have one Aiyima 04 Black board, with manufacturer upgrades for sale at eBay...too many amps...the 04 was made and tuned for NE5532 opamp, I tried several opamp and nothing sounds better.
Aiyima 04 was built with 2 board, one was blue (cheap) and one black board with upgrade water filter with two 3000uf filters up to 6000uf; use red ring inductor, LC filter network with S-iemens capacitor, E-LNA red robe audio capacitor, T-K Audio series coupling capacitor.

Yes, that second board is nice. I am not sure what they are using in the A04 Pro but in their new balanced amp D325X they have the JRCNE5532 op amps and after a couple of hours they sounded really good. At first they sound harsh but they have settled a bit and they are growing on me. Slightly better soundstage than the Muses 8920 which I am also testing in the same amp.

 

[saberger0357]

Yes, that second board is nice. I am not sure what they are using in the A04 Pro but in their new balanced amp D325X they have the JRCNE5532 op amps and after a couple of hours they sounded really good. At first they sound harsh but they have settled a bit and they are growing on me. Slightly better soundstage than the Muses 8920 which I am also testing in the same amp.

According to their blurb on Amazon, the Pro is using the NE5532 op amp. They also indicate that "can be upgraded to a dual op amp like OPA2604".

 

[Schlippwhip68]

According to their blurb on Amazon, the Pro is using the NE5532 op amp. They also indicate that "can be upgraded to a dual op amp like OPA2604".

The JRCNE5532 is a decent op amp. The 2604 is bolder in its delivery. Both are good.

 

[saberger0357]

The JRCNE5532 is a decent op amp. The 2604 is bolder in its delivery. Both are good.

They also add this little disclaimer:

"* Note: The OP amp on this unit is upgradeable to a higher quality OP amp but only by a certified electronics technician. We do not advise customers to open the case and make any upgrades or changes as it may cause permanent damage to the electronics and may pose a safety risk. Thanks!"

 

[Schlippwhip68]

They also add this little disclaimer:

"* Note: The OP amp on this unit is upgradeable to a higher quality OP amp but only by a certified electronics technician. We do not advise customers to open the case and make any upgrades or changes as it may cause permanent damage to the electronics and may pose a safety risk. Thanks!"

To my ears its like this, the Muses 8920d compared to the JRC5532 in the new Aiyima D325X and possibly the V3 and A04 sounds like they need to unite for the better op amp. The 8920 has a killer low end delivery while the JRC5532 has the better upper frequencies, loads of air around the upper mids and treble giving that more open sound but is just a little light in the bass compared. So those two combined into one op amp would be excellent…an JURC8932d maybe….

 

[saberger0357]

To my ears its like this, the Muses 8920d compared to the JRC5532 in the new Aiyima D325X and possibly the V3 and A04 sounds like they need to unite for the better op amp. The 8920 has a killer low end delivery while the JRC5532 has the better upper frequencies, loads of air around the upper mids and treble giving that more open sound but is just a little light in the bass compared. So those two combined into one op amp would be excellent…an JURC8932d maybe….

Of course if you one using speakers that already have a more bass forward presentation, perhaps the 5532 will balance them out.

 

[Schlippwhip68]

Of course if you one using speakers that already have a more bass forward presentation, perhaps the 5532 will balance them out.

That’s questionable as you will still only get what the source is giving you.

 

[Schlippwhip68]

Of course if you one using speakers that already have a more bass forward presentation, perhaps the 5532 will balance them out.

The Muses 8820d are quite a nicely balanced compromise between the JRC5532 and Muses 8920d. They have a little more air and soundstage than their Fet brother the 8920 but dont quite dig as deep where the bass is concerned but a little deeper than the JRCNE55232. It’s a good choice for the A04 and the V3.

 

[gasolin75]

Any amp with no pop sound when turning it on off for the same price and with the same power ?

 

[saberger0357]

Any amp with no pop sound when turning it on off for the same price and with the same power ?

If you’re referring to the V3, there is no pop on mine when turning off/on. The TB10D does, but only if I don’t turn the gain pot all the way down before power off/on. No issues on either my Ayima A04(upgraded) or SMSL A300.

 

[Schlippwhip68]

If you’re referring to the V3, there is no pop on mine when turning off/on. The TB10D does, but only if I don’t turn the gain pot all the way down before power off/on. No issues on either my Ayima A04(upgraded) or SMSL A300.

+1

 

[Joe Smith]

Any amp with no pop sound when turning it on off for the same price and with the same power ?

I do get a very faint power on "tick" with the Fosi V3; and a power off "tick" from the A04 amp. Very low level, barely noticeable. Not enough to damage speakers.

I've not noticed any sounds at all with the A07 amp or the SMSL AO100 amp.

 

[cyclo]

I have three Fosi V3s powering my front, center, and surround speakers... No pops on any of them when turning on or off.

 

[surroundman]

My V3 does have a noticeable pop sound when turning on and off. As I already owned an Aiyima A07 Pro before, I feel that not only I wasted my money by getting the V3 but I actually got a downgrade. The A07 Pro has no pop sound at all, can get significantly louder (using the 36V, 6A power supply) compared to the V3 (48V, 5A), to me it sounds identically to the V3, and has more features. Well, I learned my lesson ...