I feel the bass is a little bit off from what i expected it to be. I was expecting clean crisp base, but I feel it's a little bit bwaaahh that thump.
Again, i bought:
2 10" IDQ's 4ohms.
Hifonics ZX6000 - pushing 300watts to each sub.
I haven't finished tweaking the bass yet with my headunit (alpine 9815) nor with all the nobs on the amp.
I'm actually wondering if the design of the box could be causing the problem. I built it myself and i made a single compartment of 1.5ft^3. When i was looking around I saw that a box holding 2 tens actually is separated in the middle with another board. Should i have done this aswell?
Not having the enclosure partitioned shouldn't be a problem as long as both speakers are facing the same direction, and you don't have the speakers wired out of phase from eachother.
Make sure your cross-over settings are set properly on the amp & head-unit, that's important.
What size enclosure does the manufacturer recommend for those speakers?
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The cross over settings are most likely not set up properly. For both the amp and head unit. Could you tell me how.... i should do a search i know.
No way for me to tell you - the specifics are different for every piece of equipment.
But that's a pretty full-featured head-unit, I would guess that the crossover options are much more comprehensive through it than on your amp. So first make sure that the amp is playing a full or flat frequency range (no high-pass or low-pass settings), then make all your adjustments via the head-unit.
For the subs, probably start with a basic 100Hz low-pass using a 12db/octave slope and see what that does for you. If you have high-pass sub setting, make sure it's set no higher than 20Hz.
But a lot is going to depend on the rest of your speakers - if your front's play comfortably & loud down to 80Hz (or lower), there's no need for the sub to play those frequencies.
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To fiddle around with the sub amp usually it works like this:
Input voltage: The lower you set this, the louder the subs get across the range that they play.
Crossover Freq: The higher you set this (assuming that it's a low-pass crossover setting) the longer the subs will hold the notes because of the wider range. Usually at about 100hz you can start determining direction so try to keep it below there.
Bass boost: Affecfts how "hard" the subs take any note.
As for your box size it's actually a little large. Which will make the speakers a little muddier & louder, but not anywhere near complaint level.
If you have the time I'd probably throw a divider into the box to reduce the internal air volume a little bit. If it still sounds muddy throw in some polyfill, I can't imagine IDQ's (I have NEVER heard a set that didn't sound good) sounding that poor. Are you sure you don't have an air leak in your box? Test it by slowly pushing in the woofer, or both since they're not partitioned, and seeing how fast they recover. If it doesn't take a full second or so then you need to find the leak.
Though I'd suggest playing with the settings some before you try to do anything to the box other than determining if there's a leak somewhere.
yeah i was going to do a search on setting crossovers, I think i may have it on HP right now, am not too sure. I will definitely check for leaks. As you said, I will push both in and hope they take longer than 1 second.
i just checked, definitely theres a leak from my terminal cups. Figuring there wre screws involved and it was a tight squeeze to get them in, i didn't caulk the perimeter with silicon. I'll get on it later tomorrow.
By the way, I may be interested in changing the bass response by filling th enclosure in with polyfill. can you tell me where, how much, and how i installed into my box. I'm assuming it's fluffy material that you can drop into the box.
Also I'm not coming up with good idea to locate my sub amp. My back seat is taken by another amp, and it's too long to properly stand up without making perpindicular rack. Should i place it on the top of the box, and fixing the box so it wont move. I heard putting it on top is not a good idea b/c the boards bend. I'd like to place it all the way to the right-back part of the trunk.
I must of been tired when I posted that last reply. Polyfill makes the box seem larger, not smaller. If you're still interested in reading about it, here's a good read.
If you still want to make the box smaller though (fix the leak first and relisten) the best way to do it probably is to use some of the extra box making material and just throw it into the box. It'll effectively reduce the internal air volume and you can secure it down later or make nicer pieces to screw down in the box. This method is used in a lot of the pre-fabbed boxes that you buy in shops.
Personally, I wouldn't ever attach the amp to the sub box. While it makes it convienent for you to remove, it also makes it convienent for the thief to remove. If they get your box, they get your amp too. There really isn't all that much room in our cars for amps, so if you can't stand it up on the passanger side back, I'd either put it under the floor (though then you can't carry a spare), or make a cheap amp rack for it at the top of the trunk. I'm not sure exactly how big the Hifonics is, but you might also be able ot stick it under the drivers seat as another option.
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If you're still interested in reading about it, here's a good read. 
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