ok, im pretty sure im buying a xxx 15" d2... my question is will a 15" sub be able to keep up with fast paced music? i listen to a wide variety of music, and the majority of it has fast beats.. i was going to build a ported box, and would like to tune it low, but does that slow down the sub even more if i were to tune it at say 25hz? thanks for any help...

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1997 Cavalier 2 Door
Hu: Clarion DXZ-635MP
Front: CDT M6's', DRT-25's, 560's
Rear Fill: Polk Audio db690
Amps: Hifonics XX Goliath, 2 ED nine.2's
Subs:
Wiring: 4 run Knuconcepts 1/0 ga w/ Big 3
Alt: HO Delphi 160a

WTB: 2 Kinetik hc2400's, Pioneer 880prs, 2 Audioque HD312's

the "speed" of the sub has more to do with the suspension than the size of the sub.

the XXX is a killer sub, and it is pretty "fast" it will keep up with just about anything, and porting it to 25 Hz is pretty nuts really. you'd probly be better to seal it than to port it that low, and honestly, the XXX will put out enough sealed to make just about anyone happy.

i do want a lot of output but i dont want to sacrifice sq too much.. so i think i will end up porting it around 30hz like your saying..

__________________
1997 Cavalier 2 Door
Hu: Clarion DXZ-635MP
Front: CDT M6's', DRT-25's, 560's
Rear Fill: Polk Audio db690
Amps: Hifonics XX Goliath, 2 ED nine.2's
Subs:
Wiring: 4 run Knuconcepts 1/0 ga w/ Big 3
Alt: HO Delphi 160a

WTB: 2 Kinetik hc2400's, Pioneer 880prs, 2 Audioque HD312's

Say what? Changing tuning frequency by 2 hz and you are going to hear it? I hope you have bionic ears here. Any particular reason you want to go up to a 15"? What is the next size speaker in the vehicle? I can see a huge hole in your response developing here.

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Forbidden Audio Ltd. (1995)
Rob Atkinson

Eclipse / MB Quart / Soundstream / Power Acoustik / Parrot / Pioneer / Pioneer Premiere / Kenwood Excelon / Morel / Focal / Scosche / EFX / MTX / Bass Slammer / Audio Control / Blaupunkt / ARC / Stinger / Streetwires / Metra / Pac Audio / Bassworx / JBL / Infinity / Compustar Pro / Audiovox / Clifford / Autopage / Fusion / CDT and whatever else you need.

its is probly due to a spike in the group delay,which is common in ported box designs.

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Is xxx even a good company? Cuz I was lookin at some of there subs on the smartass website and there 12" xs1250 looks exactly like the cheap Sony pentagonal subwoofer except with the xxx logo slapped on it. Just a coincidence? I am not bashing xxx I really am just wondering if they are a top end company or not.

__________________
Vehicle: 2004 Chevy Aveo Hatchback
Battery: Stinger
Wire: W.S. 0 Guage (ground/power strait to battery)
Head Unit: Eclipse CD3000
Speaker Amp: Infinity Reference 7521a
Subwoofer Amplifier: Infinity Reference 1211a
Speakers: Kicker Titanium 5.25"
Subwoofer: Image Dynamics IDQ 15"

i think were talking about the older style re xxx sub (reaudio.com). not about the brand xxx

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the next size in my car is 6.5" (CDT HD-6 mids, DRT 25 tweeters) i wanted to go with a 15" because A) i found a good deal on one, and B) i want it to be loud with alot of sq still and hit hard...

__________________
1997 Cavalier 2 Door
Hu: Clarion DXZ-635MP
Front: CDT M6's', DRT-25's, 560's
Rear Fill: Polk Audio db690
Amps: Hifonics XX Goliath, 2 ED nine.2's
Subs:
Wiring: 4 run Knuconcepts 1/0 ga w/ Big 3
Alt: HO Delphi 160a

WTB: 2 Kinetik hc2400's, Pioneer 880prs, 2 Audioque HD312's

the lower you tune a vented box the more you will effect its upper bass response, tuning to 25hz is very low and will effect the upper bass attack(fast) i would contact xxx and ask them what they recommend, there is likely nobody better to help you