I've not ever had a colossus, had a goliath but it's no comparison to the 2500. I know the big older colossus's that looked like to 150.1's in one case made some good power, clearly over 3kw. I've never had to deal with hifonics customer support, lucky me. I've asked the guys at kicker a couple of questions and I got the messages instantly replied to.... Mostly because of Polecat on the forum, I swear the guy fired an answer so fast I wasn't sure if I had pressed the send button!
This reminds me of the Rockford vs Kicker thread... and I believe I'll say flip a coin in this one too. I had the choice of either doing a pair of colossus's or a pair of 2500's and I went with the 2500's. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif