Kickstarter page is landing to 404 at the moment, either page is taken off (most probably) or down because of something like too much traffic or DoS/DDoS.Am I late to the party? I don't see any time zones or discounts. View attachment 364537
I got the email and the countdown timer says the offer ends tomorrow, but Kiskstarted says it hasn't launched yet.Kickstarter page is landing to 404 at the moment, either page is taken off (most probably) or down because of something like too much traffic or DoS/DDoS.
Similar power, similare performance in other measures. I doubt very much you'd hear a difference if compared blind and level matched.Know this is subjective, which is verboten here, but do you think a pair of Fosi monoblocks would be an improvement sound wise over the XTZ-Edge A-300 that Amir tested here:
XTZ EDGE A2-300 Review (amplifier)
This is a review and detailed measurements of the XTZ A2-300 class D amplifier. It is on kind loan from a member and costs US $500 from the company direct (which is located in Europe). It is based on B&O ICE 300ASC or its newer name, 300A1. While you won't mistake the enclosure for A2-300 as...www.audiosciencereview.com
Have had the XTZ in my system and generally like it, very solid bass and well defined highs but maybe a little lacking in midrange, but wondering if the newer generations of class D represent a meaning improvement in sound.
That's odd, it doesn't show on my end.Kickstarter
THis is the link I was sent...That's odd, it doesn't show on my end.
I tried to VPN in the US (I am in the UK), cleared browser cache but to no avail.
It doesn’t show the times anymore for me, either. They must’ve changed it (again).That's odd, it doesn't show on my end.
I tried to VPN in the US (I am in the UK), cleared browser cache but to no avail.
It will be possible to get them without the psu during the kickstarter campaign? I already have a 6 channel V3 setup I want to replace.You can buy a single set indeed.
Have they mentioned that they make a new 48V GaN power supply? List is $90. How would this impact performance?This is a review and detailed measurements of the Fosi Audio V3 Mono class D amplifier. It was sent to me by the company. The price with the power supply I tested is US $139.99.
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I must say the concept of a "monoblock" amplifier in such a small size runs foul of any expectation a longtime audiophile would have! But monblock it is even though it is a very small block. Controls are on/off/trigger audio and selection of XLR vs RCA inputs -- just like the big boys! I am not showing the sides of the amp but there are very large holes with attractive orange color grid showing through. Nice. Back panel is again a bit of a shock to the system seeing XLR input:
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The power supply as noted, is quite beefy with 48 volts at 5 amps on tap (240 watts). The amplifier is stated to have PFFB implementation which for a class D amplifier means it should have no load dependency together with lower distortion. Let's see if we get these with our measurements.
Fosi Audio V3 Mono Amplifier Measurements
Let's start with XLR input:
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Wow, I did not expect this class of amplifier to break through the 100 dB SINAD barrier but the V3 Mono does exactly that, placing it in our prestigious category of "excellent:
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RCA input costs you some performance but I was relieved to not see any mains interference:
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Distortion is still at provably inaudible -115 dB. I like that the gain is nominal 25 which is my new recommendation for amplifiers.
Noise performance is excellent and at full power, darn near approaches sate of the art:
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Now the all important frequency response and load dependency test:
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There is essentially no impact up to 20 kHz between the 4 and 8 ohm indicating very low output impedance, albeit with a bit of peaking. Compare that to non-PFFB amps such as Fosi Audio V3 stereo Amp:
Above we have 2 dB differential at 20 kHz.
Distortion is very low and only increases with frequency:
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Let's see how much power we can get out of this little box:
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Efficiency must be quite high as we get essentially the power we put in (the power supply likely has some headroom).
There is decent amount of power even with 8 ohm and with very low noise:
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As note though, distortion does rise at higher frequencies:
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Fortunately it is good where our hearing is very sensitive (below 5 kHz).
I also threw my suite of my punishing reactive loads at it:
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Translating into watts:
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Amazing that this little amplifier can handle even 2 ohm load! Note that these are short term power ratings.
There may be a bit of power on noise:
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Conclusions
All I can say is wow! It is incredible how far these small amplifiers have come. It is the result of a manufacturer listening to our needs, implementing features such as balanced and trigger inputs, and proper feedback mechanism to essentially eliminate load dependency. I can't imagine asking for more from Fosi when it comes to such an amplifier. Everything is as good as you could possibly want.
It is my pleasure to recommend Fosi Audio V3 Mono amplifier.
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As always, questions, comments, recommendations, etc. are welcome.
Any donations are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/
Not at all.Have they mentioned that they make a new 48V GaN power supply? List is $90. How would this impact performance?
I doubt you will be able to sell a Stereo V3 without power supply for a fair price.It will be possible to get them without the psu during the kickstarter campaign? I already have a 6 channel V3 setup I want to replace.
Power supplies are about voltage and amperes only. If two power supplies deliver the same amount of energy at the same loads, they sound the same.Have they mentioned that they make a new 48V GaN power supply? List is $90. How would this impact performance?
Sorry for the inconvenience. Here is the correct time of the launch in different time zonesFWIW, those times don't correlate with the countdown timer in the emails they sent out.
The countdown timer in my email will hit zero at 6pm PDT.
I have my own psu so I'm not using the original ones. This is why I asked. So this upgrade wouldn't cost me much.I doubt you will be able to sell a Stereo V3 without power supply for a fair price.
Yes, but his point is that once you order the new ones and they come in, if you order the new ones with power supplies, you will have an easier time recovering some of your costs by selling your previous amplifiers with power supplies rather than trying to sell them without one.I have my own psu so I'm not using the original ones. This is why I asked. So this upgrade wouldn't cost me much.
Where is this located on FB? I don't see it.This is from Fosi FB page, they are offering very attractive early bird discounts:
Don't miss it !!!
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SU-1 balanced would do better than SU-1 single ended.Guys, do you happen to know why RCA has a Sinad penalty? If the SU-1 can get to 116, why can't this fosi amp do the same sinad with RCA vs its XLR?
Will Fosi release an optimized version for RCA? SU-1 fans couldn't care less about XLR.