on June 18, 2011
It's a basic amplifier with good quality components and a neat assembly. Power rating at 50w/ch seems fair, but I got a 35w/ch Harman Kardon and a 30w/ch NAD that were more powerfull (and much more expensive) than the AudioSource. Sound quality is very good : it's neutral, clean and without audible noise, hiss or distortion, even at near full volume.
I don't like the Auto-Switching inputs system, wich is too sensitive and keep switch between input 1 and 2 when there are quiet passages in music (on input 1). So I use only input 2. The same problem apply to the Auto-Sensing Power On, wich is useless for me.
Overall, it's a great buy for the price.
on March 16, 2013
This is a solid stereo amplifier, physically and powerfully. It has a hefty weight and feel to it.
I've only used this amp for a total of several hours at moderate to medium volume levels, but so far its lukewarm temperature at worst remains constant on the heatsink vents at the top and bottom. That was one of my concerns prior to buying it, and I'm glad that it's no problem.
My sources are a laptop connected to an external USB DAC, which then connects to this amp. I haven't dared try playing music at 50% volume because it's already loud at the 3rd-4th volume knob's "dot". This is with 4-8 ohm passive bookshelf speakers, 90 dB sensitivity.
A few cons:
1) With my ears right up front to my speakers I hear a very small background "electronic" noise (not the hissing or humming noise), even when no audio is playing. Adjusting the amp's volume makes no difference whatsoever, even at its lowest setting. I thought it was due to my inexperience at setting up my 12 gauge speaker wires, but the same result occurs when I tested them with pre-made speaker wire that I've used with my previous PC speakers for 3 years. My previous speakers were dead silent up close. Only two 2 variables have changed since using this amp: the amp itself and the bookshelf speakers. I doubt it's my new Cambridge Audio S30 speakers that are highly regarded to be the culprit. Still, this flaw doesn't matter much since it's inaudible during practical listening positions.
[Update] - Upon closer inspection the same noise emanates directly from the amp, and it's slightly more noticeable from there than from the speakers.
2) At very low volume levels there's channel imbalance in the speaker output, with the right speaker being quieter than the left. I read this is a common flaw in a lot of budget amplifiers, but I don't have much experience to confirm that claim. This also isn't a big deal since I rarely listen at that low level, and when I do it's only so that I can temporarily listen to my surroundings.
3) Whenever the amp powers off there is a "poof" noise (like the noise that occurs when a photographer takes a photo during the flash). This has been reported by other users and is the only real concern I have with regards to equipment damage / longevity.
Despite some flaws, it's still the best bang for your buck amp for 50-60 watts per channel. I contemplated whether to go with this or one of the more energy efficient, compact, cheap T class amps. I don't regret getting this since T amps tend to have high THD (distortion) % at high volumes and lack power when more volume is desired. The trade off is worth it, but you have to plan ahead due to its larger dimensions requiring more space. I also thought about the OSD Audio AMP120 for $14 cheaper since it contains the same specs and even looks almost the same (and that OSD and AudioSource seem to share other similar products like subwoofers), but it lacks extensive reviews and details. It feels safer to go with the AudioSource. That plus the OSD's volume knob is smaller, which I don't like.
on May 16, 2012
An absolutely fantastic-sounding amp regardless of the price. Nice smooth top-end, a midrange to die for, bass extension that goes Barry White deep, and an open soundstage par excellence. One tip that cannot be ignored: read the manual! For normal stereo use, 'INPUT 2' is a must, as 'INPUT 1' is signal-triggered for standby use. Either way, it's insane sound quality for $100.
on April 11, 2014
This is really a great product. The sound quality is great and it's a powerful little device.
The only drawback I see is that the "auto switching" feature (between channel 1 and 2) is a bit too insensitive, so there has to be a good amount of sound on the first channel to avoid switching to the other, otherwise the sound cuts off. Since I use it for music which does have soft sounds, the result is not that great. But I still think it deserved 5 stars because it works really well.
on May 31, 2012
I purchased this amp after reading many positive reviews online. The AudioSource AMP-100 amp lives up to all of them. This amp sounds gives a very clean, natural, tight sound. For just over $100, this is easily the best quality budget amp around. The case is an attractive solid black case with binding post connections. Something rarely seen at this price point! I am now using this amp to replace a much more expensive tube hybrid amp that has given me problems since day one. I plan to order another to power another set of bookshelves in the same system. If you're thinking about buying this amp, go for it. You won't be disappointed.