I bought a Fosi V3 along with a 48V 5A PSU, which I purchased separately; paired with Sony 3-way, 6 ohm, bookshelf speakers, mounted on floor stands. To my ears, the V3 @ 32V sounds slightly less bright and shouty in the in the upper mid-range and vocals, compared to the 48V PSU. The bass, too, has a more defined and less muddy feel to it with a 32V supply than it does at 48 volts. In my experience, the V3 amp sounds 'somewhat better' with its stock 32V power supply vs the optional 48V PSU; which I paid an additional $70 CDN for. Anyone wanna buy a barely-used 48V PSU? lol That said, I'll probably not buy another Class D amp, because Class D just doesn't have that warm & rich tonality that I've become accustomed to over the years with good quality Class AB amplifiers. I find Class D to be quite harsh and unforgiving with some recordings, and then listener fatigue eventually takes over and ruins the experience for me, with Class D amplification. Other things of note: At 32V, the V3 amp remains cool to the touch, barely gets warm at all, at any listening level. At 48V, the V3 chassis heats up quite noticeably, even when the amp is idle, not playing any audio. I used my oscilloscope to test the power supplies for AC ripple and switching noise at the outputs. I'm happy to report that both 32 and 48 volt PSUs provide a clean DC output compared to other (noisy) switching power supplies that I've tested over the years. That said, I didn't test the PSUs under load, which is the proper way to test for good regulation and low noise. I may do that later.
Nice review. Much better that the one in the video. For me, heat is am important issue. I try to keep the amp as cool as possible in order to keep it for many many years, so a noticeable heat increment is a big no no
I agree and If a person bought one of these without having full intentions of owning 2 and running them at full bore in mono shouldn’t waste their money and should be looking at speakers anyway.
Nice comparison ... Here's the ultimate power supply test .... Set it up with the 32 volt supply. Turn the volume up to a "conversational" level. Now without touching anything else... Unplug the 32 volt supply and plug in the 48 volt supply. Many people have noticed that so long as you aren't clipping the amplifier, both power supplies sound the same and play at the same volume.
Tried both and at the same power settings did not notice any volume difference, and felt the sound with the 48V was muddier than the 32V. Also, on 48V, the V3 was running hotter. So is it a matter of max. possible output power when cranked to the max. ?
Of course it’s worth the extra bucks. It would be like buying a full nitrous setup and never installing it on your vehicle. This thing is built for one thing. Power. Remember when we was kids and said if it’s to loud you’re to old. Still true today!! I’m hoping for the day they make one this small that will blow a D9. 😂
It would be bye bye V3 ... along with the chip's 53 volt limit, most of the capacitors inside are going to be 50 volt types. If you do try it, have a fire extinguisher handy.
What's better, the Fosi 48v standard upgraded power supply, or the Fosi 48v Gan upgraded power supply ?
Why have not mentioned these units ?
36v 6A is the way to go.
Nice exciting video. Good to detail the power supply details. It is important.
48V 10A kicks like a mule 😉👌
I bought a Fosi V3 along with a 48V 5A PSU, which I purchased separately; paired with Sony 3-way, 6 ohm, bookshelf speakers, mounted on floor stands.
To my ears, the V3 @ 32V sounds slightly less bright and shouty in the in the upper mid-range and vocals, compared to the 48V PSU. The bass, too, has a more defined and less muddy feel to it with a 32V supply than it does at 48 volts.
In my experience, the V3 amp sounds 'somewhat better' with its stock 32V power supply vs the optional 48V PSU; which I paid an additional $70 CDN for. Anyone wanna buy a barely-used 48V PSU? lol
That said, I'll probably not buy another Class D amp, because Class D just doesn't have that warm & rich tonality that I've become accustomed to over the years with good quality Class AB amplifiers. I find Class D to be quite harsh and unforgiving with some recordings, and then listener fatigue eventually takes over and ruins the experience for me, with Class D amplification.
Other things of note:
At 32V, the V3 amp remains cool to the touch, barely gets warm at all, at any listening level.
At 48V, the V3 chassis heats up quite noticeably, even when the amp is idle, not playing any audio.
I used my oscilloscope to test the power supplies for AC ripple and switching noise at the outputs. I'm happy to report that both 32 and 48 volt PSUs provide a clean DC output compared to other (noisy) switching power supplies that I've tested over the years. That said, I didn't test the PSUs under load, which is the proper way to test for good regulation and low noise. I may do that later.
Have you tried swapping out the OpAmps yet? I know the Sparkos are expensive but the Burr Brown Opa is almost as good.
Nice review. Much better that the one in the video. For me, heat is am important issue. I try to keep the amp as cool as possible in order to keep it for many many years, so a noticeable heat increment is a big no no
Pretty sure the 32 v will be enough for most people
I agree and If a person bought one of these without having full intentions of owning 2 and running them at full bore in mono shouldn’t waste their money and should be looking at speakers anyway.
Nice comparison ...
Here's the ultimate power supply test ....
Set it up with the 32 volt supply. Turn the volume up to a "conversational" level.
Now without touching anything else...
Unplug the 32 volt supply and plug in the 48 volt supply.
Many people have noticed that so long as you aren't clipping the amplifier, both power supplies sound the same and play at the same volume.
Где замеры?
Dear Fosi, What Banana Plugs "actually" fit the V3? Make, model and a link. Not "Chord" something affordable that I can DIY. Best, D.
Tried both and at the same power settings did not notice any volume difference, and felt the sound with the 48V was muddier than the 32V. Also, on 48V, the V3 was running hotter. So is it a matter of max. possible output power when cranked to the max. ?
Of course it’s worth the extra bucks. It would be like buying a full nitrous setup and never installing it on your vehicle.
This thing is built for one thing. Power. Remember when we was kids and said if it’s to loud you’re to old. Still true today!!
I’m hoping for the day they make one this small that will blow a D9. 😂
Can I connect 2 32Volt power supplies in series and power the Fosi at 64 volts or will that blow it up?
The max input for the 3255 is 53.5v probably be a bit much lol
It would be bye bye V3 ... along with the chip's 53 volt limit, most of the capacitors inside are going to be 50 volt types. If you do try it, have a fire extinguisher handy.
suara lebih cerah di 32 v