Performance Auto and Sound magazine tested the the ARC MPAK4 package (Arc 125.2 mini amp, 6.5" speakers, etc.) in their May 2010 issue. The test data means little to me, but it may be useful to others:

http://www.pasmag.com/car-audio/test...q=arc+mini+amp

Arc reproduced the article on their website with some useful summary charts:

http://www.arcaudio.com/productpics/...AK4%20-Mag.pdf

Those who understand the data may be able to explain it or comment on the amp/speaker performance presented. I haven't searched for this type of data previously and don't know what's out there for the various amps/speakers we consider for our bikes. So perhaps others can supply comparative data for other amps/speakers.

Arc recently introduced the 125.2BX mini amp that has special bass circuitry and cooling fan:

http://store.arcaudio.com/products/p....55622.0.0.0.0

I'm not a tech or audio guy; so the test data means little to me. And I'm not sure how relevant the data is given the environment of an audio system on a motorcycle. In any case, the 125.2 amp in my bike has worked very well since I installed it about a year ago.

Carl