Others say...

"How 'bout that! Small, but oh my. . ."
I'm very pleased with the little jewel of an amplifier that Sonic Impact puts out. The first one I purchased failed within hours, but Beach Audio replaced it promptly, and I have been using it on a nearly continuous basis for weeks now. The clarity of sound is outstanding and rivals that of any sound system I have owned (and I've owned a few!). I bought a power supply (14v 2+amps) from Fry's Electronics to power it. That was a wise decision, as I now get about all the sound I can safely wring out of this little unit. I coupled it with a pair of JBL Control One speakers, and when disappointed with the lower end (hey, forgive me; I'm a string bass player!), I added a powered sub-woofer. Now my CDs and XM radio broadcasts are reproduced with clean power and sound fantastic. So much belt for the buck!

"Battery Powered Amp"
This is a great little product for those who want a little better fidelity, but don't want to carry a "Boom Box" around with their MP3 player. Very efficient amp, it runs all day on one set of "AA" NiMh Batteries.
I have a small desktop speaker that I connect between a positive terminal on one channel to the negative terminal on the other channel for a monoral output. (Both are driven 180 degrees out of phase.) That 8" footprint produces enough sound for a hotel room. I have a couple old bookshelf speakers that I purchased at a thrift store that work very well when I am outside and can tolerate the 2 foot tall, 15 lb speakers.

The only negative thing is the battery connections are very poor. I broke mine the third time I installed a set of batteries. The top negative springs are way too long and interfere with the insertion of the lower batteries. The bottom springs are so long that they end up folded sideways behind the battery most of the time. There is an external power connection that saves the day.

"For the price, unbelievable"
I am using this amplifier to power much larger speakers than it is designed for. It does an excellent job. The only problem I have with it at all is that I cannot put batteries in; the compartment is just too cramped for my fingers to navigate. I simply leave it plugged in all of the time. For the frugal shopper, I think this is a must-have.

"Amazing little amp"
This amp is great. I made a couple of two-way bookshelf speakers with 8" Dayton woofers and connected this amp to them. The sound is high quality! It's also plenty loud for an outdoor picnic or poolside. The connections seem solid enough to unplug and plug over and over again. The batteries are not easy to get in repeatedly though. That's actually a big understatement. It's a serious pain in the butt. I will have to be careful or it will eventually break. I only want it for portability, but it's good for home use too. It takes a 2Amp power supply or 4 AA batteries. The batteries last about a half a day. Dayton has a multi purpose 2A power supply for about $28 delivered. For the warranty to work you have to get the proprietary one that costs a bit more and isn't versatile at all. I don't think $32 delivered is much to worry about though.

"great amp just as expected"
Have owned and used this amplifier for approximately 4 months. There weren't many options for miniture amplifiers, but it was great to find such a perfect solution. The Sonic Impact T-Amp received great reviews, so I figured it would be a good purchase, and it has been so far. I only use it with an AC/DC adapter, so no idea if the battery operated feature works well. But it works great with an AC/DC adapter. And it is really easy to use. Only the on/off/volume dial leaves a little to be desired. It is flat against the surface of the product and does not stick out enough to grasp with a finger and thumb, so you end up using the friction of a finger or thumb to turn the dial. Wish they would have used a knob, but I presume I could change that myself if it really mattered.