It is big, I still give it 5 stars they have the measurements listed. it powers 4, 3 way speakers and 2 tweeters in my single cab, it definitely made a difference for the speakers to be running off amp. Great quality. Simple as putting all the wires in the right place and it works like a dream. Its safety features will save your battery. They turn off when battery starts dropping in juice. (While hooking up the amp, I only had my truck turned over and I noticed nothing was working until I cranked my truck and watched my vaults build back up, turning the power back onto the amp