The IA5.1 is Incriminator Audios answer to all the mainstream companies out there with their cheap overrated entry level amplifiers. This amp is built with the same technology and is built on the exact same line as all IA series amplifiers, but has a lower price point then other amplifiers that are built on sub-par Chinese amplifier lines. This little beast of an amp is tiny as well. Coming in at 7"x8", this amp is perfect for applications where space is limited.