AudioSource AMP-100 Stereo Power Amplifier
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AudioSource AMP series amplifiers are designed for home and commercial audio distribution systems where high quality sound, flexibility, and reliability are essential. The AMP 100 features 2 independe
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Most helpful customer reviews on Amazon.com
The sound is great. It's clean through most of its power range, though it'll saturate if you really push it. (But so will everything else.) It also has transient protection. It will cut out for a second or two if hit with a transient sufficient to overload the front end, and will STAY cut out if fed a continuously hideously clipped signal. Don't consider it a defect because it's not. Just be aware that it exists so you aren't baffled when it happens. Turn down the output of the device feeding the amplifier and it should turn back on. In my case, my speakers also have overload protection, and it can be difficult to tell whether the amplifier or the speakers have engaged their protection. Either way, it only happens with signals I probably didn't want passed to my speaker coils anyhow.
My one complaint is that the power transformer has a hum to it. It's not passing this to the output, it's being emitted directly by the transformer. The easiest way to work around this is to simply move it further away from you.
I own 3 of these amps. I've owned them for about a year and a half. I didn't buy them here but wouldn't hesitate, the price here is the best i've seen. I don't have multiple inputs, i only have my computer running into them. I have an 8in/8out audio card. So i have 1 set of outs going to the first amp which is daisy-chained with the second amp using the output of amp 1 to input 2 of amp 2. I have the 3rd amp (for speakers at my bed) on a second set of outputs of my audio card.
All of my sound producing equipment (TVs, Computers, Record Player, DVD, Mutitrack, etc...) are all run into my audio card on my primary computer. All the switching between audio sources is done on the computer. The Audiosource amps receive the output from the computer.
I use input 2 for the auto power off feature, which is the reason i chose this amp. Auto power off works great. Once in a great while i'll run across something that is very quiet and won't trigger the amps to turn on, but that is very rare. Normal audio will trigger the amp in a second or two. Before i bought these amps i was concerned that the amps might switch on switch off (quick switching) during quiet passages of a song but that is not the case. It doesn't switch immediately off. I'm not sure how long it takes for it to decide to switch off but i'm guessing at least 30 seconds or a minute (maybe when i get home tonight i'll time it).
As for the volume and bass, i have 16 Polk audio Monitor30 series speakers distributed throughout my small apartment. 8 speakers on each amp (series/parallel), except the third amp is only powering 2 JBL speakers. I don't have all these speakers to play it loud, i wanted sound wherever i walk (bathroom, kitchen, living room, bedroom) which i have. The sound will get very loud if i turn it up. I have a special EQ configuration to knock out some bass (Mr Icarus Jones's fault) to prevent bothering the neighbors. Now i'm not one of those guys who needs bass like some of these cars you can hear a block away. I just need even sound which i have with this setup. If i were to add a sub woofer i'm sure these amps will power it just fine, but i'm content with the bass i have.
I haven't had any buzz problems. I do some amateur audio recording and am very sensitive to slight noise. A slight noise/buzz would drive me crazy, especially all over the apartment (i have speakers everywhere). I can confirm that there is 0 noise/buzz. These are quiet.
I have these amps rack mounted on a standard 19 inch rack. i used 3 sets of 1U mounting brackets for open post rack SA-3201 to mount the amps. I had to add 1/4 inch of wood to each side to fit it correctly and this works well. I also picked up some longer screws from the hardware store to put this together.
In conclusion, i needed a basic amp, inexpensive, clean sound and an auto on/off feature, this amp was the perfect solution. I never concern myself with turning the amps on or off, when i turn on/off my source of audio, everything else is automatic.
---------------UPDATE September 27th 2012--------------------
I think i bought my first one of these amps 2 or 3 years ago, i currently have 3. I'm extremely satisfied with these amps. I will not hesitate buying more of these.
---------------UPDATE April 7th, 2014-------------------------
I've been running 3 of these for about 4 or 5 years. Tonight i turned one on and immediately smelled an electrical burn. I looked through the rack and spotted smoke coming out of one of the AudioSource AMPs.
I didn't hesitate ordering another tonight. It's been a great AMP.
The bad: The knobs pull off easily so if you don't put them back on correctly, you might have problems. Unless you're playing a practical joke by cranking them all the way up and putting the volume knob on so it looks like it's muted. But assuming you never touch the knobs, there is another rather large problem: the auto off/standby. This seems like a perfectly fine feature for saving the equipment and power but it can be problematic if you have a weak input signal. This is particularly evident if you have long fade outs/ins or quiet interludes in music. All of a sudden, you'll hear a loud clank inside the amp and no music. Upping the input signal can help avoid this but only if you have the option. I'm thinking of mobile devices.
But there really isn't anything else out there with this power in this price range. If you need stalwart amps, these will fit the bill
Ignore the bad reviews from people that say it keeps dropping out during quiet passages, they obviously connected their source to input 1 which is an auto sensing input. Use input 2.