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Fosi Audio V3 Amplifier Review
- Thread starter amirm
- Start date
Juampa1989
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- Joined
- Dec 2, 2021
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Apparently it is not for all countries
I don't know if you are joking or not. Either way - un-necessary
restorer-john
Grand Contributor
I am not kidding. perfect solution
layman's question. The v3 uses standard 32v/5a power. running 6 ohm speakers. nominal input power 60 watts/maximum input power 150 watts. how many watts does v3 output? is this standard enough to run NS-333. or I need 48v/5a to get the most out of the speakers. thank you for your advice. sorry for my language, which may contain errors. Indonesia
If you don't mind 50+ dB of fan noise in your listening room.
Get yourself one of these, you can find them by searching for "Infrared Thermometer GM320" for below 10 bucks:
https://de.aliexpress.com/item/1005004177656909.html
I suspect it may be off half a degree or so at times, but it's close enough for technical applications. Try to measure the temperature of a clear sky in the heat of the summer, you will be surprised. ;-)
Anyway, i measured my V3@48V at 46°C at the highest, driving a pair of Wharefedale Linton 85 at "groovy" levels over a few weeks. 46°C feels hot to the touch, but is far from overheating the chip or any components. It's about as warm as the inside of my Yamaha A-S1200 or the surface of the enclosure of a MiniDSP Flex.
No need for active cooling, in my opinion. It may make yourself feel better, but there really is no need.
@Fosi Audio You got a winner, but it doesn't even come close to even the cheapest Yamaha, Denon, Rotel, NAD integrated amplifiers. Where is the remote? I want to switch between speakers, i want to connect multiple sources, i want tone controls and a headphone jack. Just a good implementation of a Texas Instruments TPA3255 won't be good enough in the long run.
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I live in one of the densest populated areas in Europe, the fan noise would be drowned by room noise, which sounds like this, at all times:
Thankfully i have wooden ears and double glass windows.
I would get the 48v power supply regardless, as you might change the speakers or room in the years ahead.
Use this to calculate how much watts you need. Try to get to 96dB to be able to listen a bit louder. Consider that this calculates one speaker, you need to add +3dB if you use two, like most of us, so you aim for at 93dB, more is better:
It also depends on how much you put into the RCA connectors, but let's just assume it's a perfectly implemented streamer that outputs clean 2V max.
Yamaha states 87dB sensitivity for the NS-333. In my room i would sit 3m from the speakers and they would be 80cm from the wall. To get to 93dB (plus 3dB for the second speaker to reach 96dB), i would need 18W.
This of course is just estimated, as it depends on the source output, the music itself and so many other factors. My guess: It's enough for loud music, but you won't bring the house down with this speaker/amp combination. It would be more than enough for my taste.
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What is this, some amplifier module?
In any case, you should measure the temperature, feeling it isn't really good enough, most people would overestimate the temperature.
With the 32V PSU the measurements gave 32W into 8ohm and 62 into 4 ohm. With 6ohm speakers you'll be roughly half way between the two so around 47W. These are figures for clean power. For the more common 1%THD rating (to compare with published specs of other amps) you can probably add 20% or so. So maybe about 60W.
Your speakers are reasonably sensitive at 87dB - The 32W will be fine for close listening (eg a desktop situation). If your listening space is more "living room" then you might want the 48W. It does give loads more power.
I got the 32W because with the discount that was available on that, I can buy the bigger PSU later and still pay the same as buying the amp with the big PSU from the start.
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