early rejecter
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I keep mine in Auto on/standby which has worked well with no thump when coming out of standby.
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Fosi v3 Mono - User Impressions | Owner's Thread
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saberger0357
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I just got a gigantic thump when shutting down my ZA3's via the power strip, so probably has something to do with that? Also the amps and sub and sub are connected to same power strip so maybe that has something to do with it? Don't know but will have to investigate further. Never have issues with any of my McIntosh gear.
saberger0357
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Well it’s not the amps. I’ve switched out the 48v/10a ps because when I would turn on the amp I got some kind of weird electronic noise coming from one of the amps. Replaced with each amp on a 48v/5a ps and no more noise. I also now manually just turn each off amp separately waiting a couple second for the first amp to go down and then turning off the second and they’re both perfectly quiet. I think something just doesn’t agree with them when I shut them both down simultaneously using the power strip.
I really like these V3’s a lot but I must admit that I can’t be perceive much if any difference between them and the ZA3’s(maybe a tad more muscle with the V3’s)and being able to connect my subs with the ZA3’s as opposed to having to use an adapter with the V3’s and another set of speaker wire makes the ZA3’s more appealing to me. I only just started to use subs about a month ago and wasn’t using them when I first got the ZA3’s and quite honestly forgot they had that ability when I got the V3’s.
I really like these V3’s a lot but I must admit that I can’t be perceive much if any difference between them and the ZA3’s(maybe a tad more muscle with the V3’s)and being able to connect my subs with the ZA3’s as opposed to having to use an adapter with the V3’s and another set of speaker wire makes the ZA3’s more appealing to me. I only just started to use subs about a month ago and wasn’t using them when I first got the ZA3’s and quite honestly forgot they had that ability when I got the V3’s.
Slave IV
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What kind of pop is scaring everyone? Is it from the speakers? Mine don't “pop” but they “click” from what I assume is the relay turning them on and off. I keep mine in auto mode and there has never been any sound that was alarming to me, it’s the same “click” sound that my receiver makes when it cycles power.
saberger0357
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Yes mine was more like a loud, electric sounding click. But it definitely had to do with shutting down both amps using a power strip, as opposed to turning each one off separately using their respective switches. When done this way, no more clicks, pops, or any other scary noises.
Hi. I’ve just got the v3 monos having had the v3 stereo for a while. So far honestly I’m not hearing a huge difference, both sound very good but it’s early days. What I definitely have noticed is that the monos are quieter than the stereo version, very noticeably, which I didn’t think would be the case. Got the 48v/10a split power block & monos are set to 31dB gain. Stereo has the 48v/5A power block & it’s set to max volume.
This isn’t a huge deal as both plenty loud just interested in what the reasons might be & if others are hearing the same? Is the gain lower on the mono despite having greater power?
This isn’t a huge deal as both plenty loud just interested in what the reasons might be & if others are hearing the same? Is the gain lower on the mono despite having greater power?
It could have something to do with the V3 monos having PFFB (post filter feedback) while the V3 stereo does not.
Interesting. Didn’t know that affects gain. Is it a bit like reducing pre gain to avoid clipping? Is that how it levels the response? As you can tell I know very little about this.
I saw one post saying that amplifiers with PFFB require a little higher input gain than non PFFB amps. Sorry I didn't save it, but it does make sense.
I did a quick and unreliable test here earlier today with my V3 Monos vs a V3 stereo. On my desktop setup with Sony SSCS5 speakers, I did not notice any difference. On my main system with Klipsch Heresy IV speakers, the V3 Monos seemed to be slightly louder. Neither stood out as being very noticeable. Auditory memory can't be trusted so who knows? There definitely wasn't a night and day difference between them.
It would be nice if someone with expertise about amplifier types could explain the differences.
Thanks. This is what I would have expected. The volume difference I’m hearing is pretty clear, but I’ve got an amp switcher arriving today so should be able to a/b test without the cable changing. I’ll report back.
Well. I did say it wasn’t the biggest deal no need for that. And volume control is irrelevant if set to max. The specs state the gain of the mono should be higher than the stereo so…something is not operating as it should be?
Ok so mystery solved. I asked Fosi support and they got me to check the labelling on one of the resistors. Turns out I have the “updated” version with 19/25dB gain instead of 25/31dB, but the labelling on the rear panel hasn’t been updated. I don’t know why they made this change or if anything else was affected.,
Truth is I’m probably returning them anyway. I can’t tell any difference a/b testing with the stereo version at all. In fact the monos have slightly higher buzz through speakers when no music is playing. I’ll keep testing for a few more days to make sure.
Skeptical_Aus
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I am also running my v3 monos into Heresy IV's. A year down the track and no issues. I really hope they last, even though they were so inexpensive that failure is unlikely to really be an issue - although I am not really comfortable with a throw-away mentality. I would like a NAD C298 or similar but I know there won't be anything audibly different, more just for the reliability....so I am forcing myself to just listen and give up fomo.
I got an email from Fosi re Heat issues 
fosiaudio.com
The Truth About Amplifier Heat: Normal or a Warning Sign?
Amplifiers play a central role in any audio system, boosting delicate input signals into the powerful sound that drives your speakers or headphones. During regular use, it’s common to notice the chassis becoming quite warm—or even hot to the touch. Understanding why this happens and knowing how...
fosiaudio.com
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