what size box were the idq's in and how much power. That I can model and tell you the difference between the two easily lol. I'll even graph it. Anyway my setup is basically a 8 with horns, soon to be a 10, or an even higher effeciency 8, idk yet lol.
edit: I went ahead and estimated. This is teh idq's in 3.5 cubes as that's the box you said earlier for a sealed 15 so I assumed that about what you used for 3 12's. I used the 2.5 cubic foot box for the AV I discussed earlier. Power is 1000 watts to each, so apples to apples. IDQ's yellow, AV pink. The AV is a little quieter above 50hz about a decibel, not super noticeable, but gets louder below that. By 30hz, where the "lows" are on most music you've got a 3 decibel gain over the IDQ's. You also have a little less up top so that will make the bottom end more apparent. If the overall sound you want in your car is the 3 IDQ's just digging a little lower then that box should pretty much nail it right on. The AV will also have lower distortion too so that should keep it sounding just as clean or cleaner than the IDQ's. The IDQ's have an f3 at 50hz, the AV is at 35hz. Cabin gain changes those numbers, but it affects both equally since it's the same car. The AV will defintely have more bottom end presence in that box.
URL=http://img52.imageshack.us/i/finalcomparison.jpg/]
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edit: I went ahead and estimated. This is teh idq's in 3.5 cubes as that's the box you said earlier for a sealed 15 so I assumed that about what you used for 3 12's. I used the 2.5 cubic foot box for the AV I discussed earlier. Power is 1000 watts to each, so apples to apples. IDQ's yellow, AV pink. The AV is a little quieter above 50hz about a decibel, not super noticeable, but gets louder below that. By 30hz, where the "lows" are on most music you've got a 3 decibel gain over the IDQ's. You also have a little less up top so that will make the bottom end more apparent. If the overall sound you want in your car is the 3 IDQ's just digging a little lower then that box should pretty much nail it right on. The AV will also have lower distortion too so that should keep it sounding just as clean or cleaner than the IDQ's. The IDQ's have an f3 at 50hz, the AV is at 35hz. Cabin gain changes those numbers, but it affects both equally since it's the same car. The AV will defintely have more bottom end presence in that box.
URL=http://img52.imageshack.us/i/finalcomparison.jpg/]