Personally I would not leave these plugged in permanently if I am not around.
I have the Aiyima A07 , I have an Hypex NC252. The latter doesn't hiss in speakers past a few centimeters, the first still hiss at 2m. Exactly the same.Got an A07 yesterday as a temporary solution. Quick impressions:
Not sure if I'm going to keep this, even as a temp solution. Just want to get rid of that speaker hiss for now and this certainly doesn't achieve that, although it is better than my current setup. Also, the fact that I'd essentially have to glue it down to keep it in place doesn't really work in its favour
- It's tiny. The pictures really misled me: It's only about half the size of my DAC (SU-9n). About 15 x 10 x 4 cm.
- My speaker cables are trying to pull it off the shelf
- It looks and feels cheap. I get it, it's an amp for 80$. The volume knob is scratchy, there are some small scuffs on the housing of my unit, some of the feet fell off/didn't really stick, the 32 V PSU which came with it looks "barely trustworthy".
- The PSU emits a faint noise around 7 kHz when plugged in, which is audible up to 0.5 m away. Not really of any concern, as it's inaudible where it usually sits (e.g. behind a shelf).
- There's no speaker pop when turning on the amp. Was kinda impressed considering the price.
- There's some speaker hiss. In a quiet environment, it's audible up to about 2 m with my ELACs (sensitivity 87 dB) with the volume set to 5/60 on the amp. In an unfair comparison, on a Hypex NC122MP-based amp, speaker hiss is only audible up to around 0.2 m.
- The speaker hiss scales with the volume setting.
- Overall, the A07 works and sounds fine. There's really nothing special about it and nothing to complain about.
- My subjective impression is, that there's something up with the treble. Might be placebo, because I stumbled upon the measurements by @pma here, before I got the Aiyima. There seems to be a very faint lack of higher frequencies (>7 kHz). Can't really put my finger on it and it's probably imagination. I'm sorry that I can't provide any measurements for this. Nonetheless, it should be clear that this amp isn't as perfectly corrected as a Purifi unit for 20x the money.
Hi Wizard, I have two A07 which I switch on with a relais. If you switch the amp as last on there is no pop.Hi Everyone,
From the original review:
Now because of this statement, I would like to put this unit behind a smart switch, but I am worried that if I leave it in the ON setting and I restore power with the smart switch, it will pop my socks off
Can anyone with this unit ease my worries or confirm I'd have to buy extra strong elastic socks?
Thanks!
Very simple, 36V/9.5A max. 200W, 48V/7.5A max. 180W, 48V/10A max. 300W. Each at 4 ohms.Advice needed,
A07 with 32v 5a power adapter connected to 3 way floorstanding Kef 103.3
Impedance: 4Ω
Sensitivity: 92dB
Recommended Amplifier: 50 to 200W
Planning to upgrade the power adapter to 350w
What will be the best combination?
24v 14.5a
32v 11a
36v 9.5a
48v 7.5a
Or lower 240w as 24v 10a?
Thanks in advance for any advice
With that sensivity you will likely not need more than 20wpc, so any adapter will be fine. Unless you go with very loud music (Which can be harmful to your ears)Advice needed,
A07 with 32v 5a power adapter connected to 3 way floorstanding Kef 103.3
Impedance: 4Ω
Sensitivity: 92dB
Recommended Amplifier: 50 to 200W
Planning to upgrade the power adapter to 350w
What will be the best combination?
24v 14.5a
32v 11a
36v 9.5a
48v 7.5a
Or lower 240w as 24v 10a?
Thanks in advance for any advice
I'd bet he does not need more than 5W/ch (being generous).With that sensivity you will likely not need more than 20wpc, so any adapter will be fine. Unless you go with very loud music (Which can be harmful to your ears)
I want you to look at the TPA3255 datasheet at figure 8:Advice needed,
A07 with 32v 5a power adapter connected to 3 way floorstanding Kef 103.3
Impedance: 4Ω
Sensitivity: 92dB
Recommended Amplifier: 50 to 200W
Planning to upgrade the power adapter to 350w
What will be the best combination?
24v 14.5a
32v 11a
36v 9.5a
48v 7.5a
Or lower 240w as 24v 10a?
Thanks in advance for any advice
Yes, the stock power supply is way more than enough. I have an Aiyima A04 and I'm using a 20V 4A laptop charger (more than enough). I tried a meanwell 32V and it did not worth it, too big and no sound improvement (yes, maybe the volume pot was at lower position but who cares).Their regular Aiyima power supply (32v 5a) would be capable of 160 watts, correct? So even it would probably be fine for normal volume levels...
Yes, the stock power supply is way more than enough. I have an Aiyima A04 and I'm using a 20V 4A laptop charger (more than enough). I tried a meanwell 32V and it did not worth it, too big and no sound improvement (yes, maybe the volume pot was at lower position but who cares).
I know how much power I usually need (20-50mW "miliwatts"), So I don't care about bigger power supplies.
Use a Kill-a-wat if you have one and measure with the amp on but no sound, then play very loud music and measure again, and do the math.
Sure, that will work. The same way the stock power supply will. It would be better to spend the money on a cheap preamp or tube preamp like the Fosi Audio, FX audio or Suca Audio. It will allow you to increase the input audio signal.Would a wall wart 24v 8a power supply like this be appropriate?
It has the correct 5.5mm x 2.5mm connector. I'm running a Drok 10a adjustable PS and usually keep it at 36v. Maybe I should back it down to 24v. How do you think these would compare noise-wise. The Drok runs very quite to me and costs less but of course you have to make/buy the cables which puts them at about the same cost.