subs bottoming out

I have (2) TS-W2000SPL pioneer subs in a ZO6 vette and a 1250d planet audio class d mono amp. The subs are in 2 different 1.501 cubic foot boxes and at the really hard bass the subs start popping. They are paralleled to each other and then to the amp to pull 1 ohm @ 1250watts. Is it possible that the subs are not getting enough power and that be whats making them pop or does someone know of something else to do. The subs are right behind the seats facing towards the rear bumber with a 3" gap in between boxes for air to come back through.

what are the watts and ohms of the subs?  could also be possible that the box is too large. Are the subs recamended for a 1.5 cubic foot enclosure?

The Pioneer TS-W2000SPL subs are 4ohm DVC's rated at 750RMS 2000Peak. The planet audio 1250D is 1200 x 1 @ 1ohm.Squirrel

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subs are recommended @ 1.5 cu ft including displacement of subs. They are 2000 watt subs and they are dual 4 ohm.

Have you tried lowering the gain?Certified Security Specialist

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Gain has nothing to do with power. If your signal is clipping(if you happen to be running a loc it probably is) then that would cause the sub to sound like a thud. If you lower the gains then the clipping would be apmplified less. As far as subsonic filter is concerned it needs to be set at what would be considered subsonic. Generally you can't hear sounds below 20 htz so set it there. For 12 I set lowpass x-overs at 45 htz. Just two things, from my experience pioneer subs just sound that way, and no one lives up to what they claim, sure the sub will handle 700 watts but that is without distortion and the amp will produce 1200 watts, more then likely above 16V, just not in your car. Also as far as the noise you are hearing, if it sounds like a thud and offen then it is probably the amplifier clipping, if it is a rattle it is either just basket noise or the coil has unwound. You should also try messing around with your airspace, take a sub out and add a book or something solid to take up airspace, if that sounds better then make something that will take the up the airspace permanently. If this doesn't help go to a fabric store and ask for dacron or pillow stuffing. Loosely pack the box with this and see if that sounds better, it is only like 3 bucks for a bag of it.Certified Security Specialist

Always check info with a digital multimeter.

I promise to be good.

Tell Darwin I sent you.

I've been sick lately, sorry I won't be on much.

As far as the X overs go you should set the low pass somewhere in between 80 and 100 Hz and the sub sonic filter to 15 Hz. If you have the x over set wrong that could be causing your popping / bottoming out.  I would not suggest that you set the low pass to 45 Hz as mentioned above Also do you know the exact volume of your enclosure?

I would set the subsonic filter slightly lower than the tuning frequency of the box.  If you set the subsonic filter a lot lower, than it will cause your subs to hit at frequencies that your box can produce.