The IP153 is a cab the exact dimensions as the IP212 and IP310. Same weight. It has 1x15", 2x6"s, and a tweeter. It has two amps within. One 500w into 4 ohms does the highs. The other is 500w into 8 ohms and does the lows. When the EX115 is added, a 1x15 cab, that amp does 1000w into 4 ohms. Like the IP112 the DSP has two settings one for a single cab and the other for the additional 1x15. ..."The DSP is programmed not only for Eq'ing and Compression/Limiting as in the other IP models, but it also has all the filtering for the crossover between the 15 and mid-tweets as well as time alignment. The DSP along with the second channel of amplification has really allowed me (Jim) to take the IP concept to another level."