New car (weird audio setup)

[Camaro9teen96]

OK im gonna try and get this out without being too lengthy. Please bear with me. Ok I just bought a 95 Z that had a new system put in. when i look its got a new head unit clarion EQ and had two premier(Spell?) 10"s on the rear deck with two competition fultron 75W X 2 amps. was ok but wanted more in bass dept. So i took my Hart dual vox coil 12 and pioneer 760W mosfet amp and placed them as i Had them in my 96 Z. What I did was took the amp to the two tens and removed it and run the remote, ground, and pwr wires to the pioneer. now no matter what i do ive got less bass on my 12 than i started with on my two 10s. any ideas?

[White Rascal]

Two 10's move more air than a single 12" so dual 10's naturally should be louder than one 12". What size and type of enclosure were the 10's in? What size and type of enclosure is the 12 in? How were the two Fultron amps hooked up to the 10" subwoofers? What impedance are the VC's of the 12" subwoofer and how do you have them wired to the amp?

[Camaro9teen96]

the two tens were in a small truck box and both were hooked up to one of the fultron amps bridged of corse. and my 12 is in a box built to go in the hatch behind the flip down panel (out of sight) the 12 box is pretty deep (wouldnt fit without t top holders removed). and my pioneer amp is bridged and each voice coil is hooked to the box seperatly and i have the voice coils seriesed together. as far as the way the speakers are sut up now its no different than my last camaro but the output is way less. i was wondering basically what to do with the EQ to get best output.