Which one is the best SQ subwoofer? I'm currently using IDQ12 and i would like to get something more clear in bass. Please give me some idea and advice. Thousands of thx. BTW sub's amp is JL 500/1

more clear ?
just curiouos what are the dimentions to your enclosure and what are you expecting out of if, what kind of range and so on

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BUILDING STUFF IS COOL ..... BREAKING IT IS MUCH FUNNER !

a gent named DWVW once said (paraphrase) 'a sub makes a sound that is completely a-musical, that is, it is just not musical in and of itself'. The problem you describe is primarily a mid-bass issue. The subs you have with the amp you have should perform more or less as described, so I would be looking at phase and crossover issues.

There are many 'best' SQ subwoofers... you even own one of them

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MECA SQ

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I don't know what your problem is, but I'll bet it's hard to pronounce.

there's bad, good, very good, and excellent or great equipment...but no "best". You own excellent equipment already. Find someone that can help you figure out what the problem is in your SYSTEM (note capital letters).

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2004 300M SPECIAL
Alpine CDA 9833
Alpine Pxa-h701
Alpine Rux-c701
Rockford fosgate p400-4
Rockford fosgate p4004
Hifonics BX 1205D
JBL c608 GTi
JBL p693
Infinity 2.5" center channel
Alpine type R 12"(2)
all active SQL set up with 1900 watts rms

thx for viewing the post and reply. The enclosure is 1 cubic feet sealed box. the head unit is JVC LH-810, JL XR650csi component. I don't have rear speaker replaced, all fader to the front. BTW component's amp is Nakamichi PA1002. I'm fine with JL's component, very clear. let say if mid-bass is the issue, so it is the amp tuning issue too? Shall I have someone to tuning the amps setting? Any suggestion of the store? I'm living in Mississauga. I'm fine to drive to GTA. Someone say the weak part that I have is the deck.... do u think so? if yes, any suggestion of the deck with those equipment? I'm pretty like Pioneer DEH-P880PRS in personal. Please give me more advices or change about my system. All of your advices are really going to help me about what to do next. Thousands of thx again.

If you're not for adding mid bass drivers, there's not much you can do.

I'd try one of 2 things.....either upping the x-over frequency of your sub which is an excellent sub BTW....or try running a different sub at a higher frequency and see if you like better.

You COULD also try adding some low end to your JL comps although the result will likely be minimal and not worth it.

And I really don't care what Dereck said, the sub is a very tweakable part of your system and can play a MAJOR role in how your system sounds especially when dealing with a system without mid bass drivers like a lot of systems are....it really can make or break the way your car sounds.

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My old van and install.

http://www.sounddomain.com/ride/634352

The rest of the install pics.

you may also want to try moving your box around to different locations in your trunk or hatch. Many vehicles are very particular about sub placement for best response....and it cost nothing but time and effort! the other thing to remember is that not all source material has a lot of midbass, so depending on your music choice, you may not have midbass heavy tracks.

__________________
2004 300M SPECIAL
Alpine CDA 9833
Alpine Pxa-h701
Alpine Rux-c701
Rockford fosgate p400-4
Rockford fosgate p4004
Hifonics BX 1205D
JBL c608 GTi
JBL p693
Infinity 2.5" center channel
Alpine type R 12"(2)
all active SQL set up with 1900 watts rms

With respects to SQ, the subwoofer is the least important speaker in the car. All it needs to have is relatively smooth deep response and be balanced in output compared to the rest of the system.

Trying to ask a sub to cover midbass duties is an exercise in futility.

IMO your box is too small which will make that woofer peaky and 'bonky' sounding. I suggest a larger and preferably vented enclosure

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Paul Niwranski
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If you're mirrors ain't shakin...you got taken...
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Be careful what you wish for...

Subs may have the smallest octave to play but can make the biggest difference.

Maybe I say that because sub response resulted in my second place finish at IASCA finals. Or maybe it's because I’ve learned much through tuning sub response.

Anyway, I would not be surprised to learn you just have a poor box.

Not that it's too small or too larger; it's just a poor box and sounds like booming particle board.

If you have an old IDQv1, 1.0cf is small. If you have a newer IDQ (v2 or newer), 1.0cf should still be a nice sealed box volume.

I would not port an IDQ if what you want is SQ. Porting is not going to improve frequency range or make the sub play any cleaner.

500 watts is a lot for an IDQ but it can handle it with properly set gains.

I would:
1. listen to see if I'm getting excessive enclosure noise.
2. make sure the enclosure is secured to the vehicle.
3. resolve any vehicle rattle issues that occur as a result of the sub.
4. Tuning. (note, all the above stuff to me is install)

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Ant

And we would both agree with you. The sub 100Hz frequencies are not all that ... attractive by themselves but while listening to music if you turn off the sub you will find you have also lost a lot of what made your music enjoyable. Derricks point was most problems were in the midbass rather than the sub itself. I have never used that sub so I have no comments on setup/ install of the sub but it needs to be installed correctly to get the most out of it. You didn't abuse it did you?

But as far as tuning goes... I agree with Brandon's thought , check crossover points, phase of the sub, TA, check for panel resonance, and so on. Fade the sub all the way out and then slowly ease it back in till it 'meshes' with the mid-bass, and yeah try different locations....a LOT of good items on bass tuning in this thread.

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MECA SQ

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I don't know what your problem is, but I'll bet it's hard to pronounce.