tried doing a search but nothing came up comparing the two. my electrical will be containing a 200-250 h/o alt, redtop under hood and 2 yellowtops somewhere in cab. subs will most likely be 2 15" fully loaded BL's(maybe 2 BTL's on the colossus I at .5 ohm bridged) and all of this will be going in an extended cab F150 truck. so yea i think my electrical will be good for the setup. now my main question is which amp to go with? i already own the colossus II but read that the colossus I is more stable and it can be run at .5 ohms bridged pushing 4000 x 1. if i can get the 4000watts then i might try for the 2 BTL's but can the amp be run at .5ohm daily?