Are you using the internal crossover in the amp? Did you originally run the HAT passive and then switched to active? I have a Alpine 9887 also. I'm ooking at the IDQ 12 w/ PDX 600.1 for substage. Do you think this will be a decent setup?
I was looking at the Alpine PDX 2.150 to run the Clarus 61-2 comps. I talked with Scott and he says that the PDX is not a really good SQ amp. He did mention the new JL HD amps. I'm looking for a amp like these that are small, don't get hot because it will be located in the cargo compartment in my Trailblazer.