-Jim-
Member
That's sort of what I expected. Part of the risk in buying overseas is the return freight and handling is on your dime in case of warranty.
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Fosi Audio V3 Amplifier Review
- Thread starter amirm
- Start date
I'd be interested in @Fosi Audio opinion about the bass response at low volumes, whether the Frequency Response should be affected by that...
SuperDerpBro
Active Member
Yup.. Too bad I read their blatant lies, and believed them, when I ordered.
heh
Return Policy
30 Days Free Return At Fosi Audio, we always strive for the highest customer satisfaction. If you are dissatisfied with the product or if it has any defects, you can request a return or refund.
fosiaudioshop.com
Guddu
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Yup.. Too bad I read their blatant lies, and believed them, when I ordered.
Return Policy
30 Days Free Return At Fosi Audio, we always strive for the highest customer satisfaction. If you are dissatisfied with the product or if it has any defects, you can request a return or refund.
Amazon is a safe bet, may be next time!
Thanks for sharing your experience.
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We just confirmed with our R&D team, the frequency response curves are the same under various volume levels.
Stretch2002
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Hi Mutolay
The whole enclosure is designed to be a heat sink, so the case will heat up by design. 50-60C sounds warm, but may not be abnormal operation for your room's ambient temp and the airflow around the amp. The only way for it to be 'clearly overheating' is if the amp goes into protection mode.
There's a youtube test that found that in their testing their V3 sample went into temp protection at about 66 celsius (see from 8:25):
Waiting for mine to be delivered!
Cheers!
-Jim-
Member
The standard allowable temperature rise most electronics comply to is 40°C above ambient. Ambient is defined as 20°C. So having protection trip near 66°C is prudent.
-Jim-
Member
I made a comment on the Fosi "The Story Behind Fosi Audio V3 Amplifier" YouTube video about the pre-out and they replied:
"Thank you for your advice. Our team had revised the pre-out port and it will behave like a real pre-out. This revised version will be available in the fourth quarter of the year."
So if this is important to you, I'd hold off until then! Enjoy.
"Thank you for your advice. Our team had revised the pre-out port and it will behave like a real pre-out. This revised version will be available in the fourth quarter of the year."
So if this is important to you, I'd hold off until then! Enjoy.
Zek
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No, you're actually a beta tester...
Of course, the frequency response was not tuned to lower the bass when high volume is used.
But the design struggles with 45-145Hz when pushed to its limits.
I insist that this seems to be a "worst case scenario". Only 6% of ASR members listen at more than 90dB (see this poll). So this 100dB test is not likely to show what will happen in a real use case, with reasonable listening level.
Everything should be OK at reasonable levels.
A probable explanation is clipping, which is more likely to occur in lower frequency, as shown in Amir's graph
But certainly not under complex/speaker loads.
You should not see any problem at low volume. The issue I show likely only exists when the amp is pushed to its limit, as it is caused by clipping
Equal-loudness contour - Wikipedia
Yes, I didn't even think about this...Equal-loudness contour - Wikipedia
en.wikipedia.org
Loudness function is so neat for that reason
Or just use a preset in equalizer apo to make low and high more prevalent
Valvetubehead
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Sourcery and switchcraft
I'm currently using mine with a Nikko Beta 20 preamp, and can punch up bass and treble slightly at low volumes. It lets me run the Fosi volume at about the 3 o'clock volume level and "dial in" the level I want using the stepped volume control on the Nikko. With the 32v power brick, this gives me a very high amount of volume control, important for this setup as the speakers are pretty close to the space we use for board games, reading etc. No doubt I'm adding some noise into the chain by using an older preamp but that's OK for this purpose.
I also think that added noise is worth it considering the features (as tone control) you can get with the preamp.
If you want a new preamp for cheap, Fosi released the SK01. I did not measure it (lack of equipment and knowledge), but can guarantee its functions are numerous and good !
You have tone control, loudness mode, and adjustable gain. I talked about it here, but people seem to not be interested in this device.
Yeah, I noticed this. Oddly, I don't think that is even on their website yet? I've been accepted into Fosi's testing group but this was not one of the things they offered to send me.
I'm hoping the functionality of this headphone amp that you note is something they could carry into a similar product that would be a preamp to match with the V3 form factor. Maybe just as a high-function equalizer. Having the old style "loudness" button is pretty great. Ideally, I keep hoping Fosi will do V3 style monoblocks (internal power, no volume control) and a matching preamp/equalizer to mate with it...all solid state...
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