what subs are best for sq?

for example what is better? 10" 12" 15" ? dual voice coil or single? free air or boxed? ported box or sealed

im just trying to get a general idea on what type of setup gives the best sound quality

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Vehicle - 1984 Vk Calais
Head Unit- Sony CDX-5260
Front Stage - Jaycar Response 6.5" Splits
Front Stage Amp - Audioline AL-2150
Comming Soon
Subwoofer - Blaupunkt PCWI-1200 x 2
Subwoofer Amp - Possibly Coustic 320QE

I believe 12s provide the best compromise between the rumble of 15's and the tightness of 10s. I also believe a selaed box is best for SQ although this depends on the sub as well...
SVC or DVC makes no difference in terms of SQ it's merely for versatility

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VTII Berlina
HU:Alpine CDA-7876RB
Front Splits:Philips GTM-1750
Rear Fill:Factory (HU Power)
SUBS:2 * Apline 12" DVC type-R
Front Amp:Philips DAP4040 bridged onto each set of splits
Sub Amp:Alpine 1507


[Edited 1 time by STIK79 on 17 June 2002 at 13:57]

that depends on:
whgat music you like,
what application (free air, ported/sealed)
what brand,
what car they are going in.

generally 10's are considered to produce tighter bass, though i think 12's can do just as well in the right setup,
15's can sound sloppy, but it all comes down to brand, installation amp etc. as well.

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'96 Mirage
Rockford RFX9300 deck
Rockford FNP 2614 splits (soon to be rear fill)
Alpine MRP-T130s front stage amp (soon to be rear fill amp)
What?no subs?
Waiting to be installed: Focal 165W3's
Coming soon: Vrx power baybe!
TEAM "CRAIG DAVID" (You all know the chicks dig it)
Another ANTI Team Craig David Member

i wouldn't use 10's as they don't cover the lower sound frequencies as well as i like,
single and dual VC's can alter the t/s paramteres of the sub, which could have an effect on SQ, but this would vary between models and would be co-incidental,
mostly SQ subs are SVC, as running one sub off 2 amps or 2 different channels can lower SQ.
i haven't seen any dedicated Sq subs that are DVC, but i'm sure some exist.
amps provide best SQ at 4ohms or higher, (hence the infrequency of DVC SQ subs) so running subs in parallel should be avoided, though the difference in SQ could be minimal.


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'96 Mirage
Rockford RFX9300 deck
Rockford FNP 2614 splits (soon to be rear fill)
Alpine MRP-T130s front stage amp (soon to be rear fill amp)
What?no subs?
Waiting to be installed: Focal 165W3's
Coming soon: Vrx power baybe!
TEAM "CRAIG DAVID" (You all know the chicks dig it)
Another ANTI Team Craig David Member

Anyone who reconks they can hear the difference between running a sub @ 2ohm vs 4ohm has pretty amazing ears - hell even if it quadrupled the thd from .1% to .4% 99.999% of people can't hear the distortion in a sub until %1 at the earliest and more likely 10%!

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VTII Berlina
HU:Alpine CDA-7876RB
Front Splits:Philips GTM-1750
Rear Fill:Factory (HU Power)
SUBS:2 * Apline 12" DVC type-R
Front Amp:Philips DAP4040 bridged onto each set of splits
Sub Amp:Alpine 1507

i've heard subs off a PHD2, a 4 ohm they sounded pretty good (though not what i'd call high SQ)
then i heard then at 2 ohm in WeaponX's monster, was hella loud, but didn't sound anywhere near as good as the other setup.

that could have alot to do with WeaponX's huge slot ported box,
the other setup was a rockford 12, in a ported box (he said around 45Hz)

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'96 Mirage
Rockford RFX9300 deck
Rockford FNP 2614 splits (soon to be rear fill)
Alpine MRP-T130s front stage amp (soon to be rear fill amp)
What?no subs?
Waiting to be installed: Focal 165W3's
Coming soon: Vrx power baybe!
TEAM "CRAIG DAVID" (You all know the chicks dig it)
Another ANTI Team Craig David Member

[Edited 1 time by Mr_Bob on 17 June 2002 at 14:24]

more than likely different box...

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VTII Berlina
HU:Alpine CDA-7876RB
Front Splits:Philips GTM-1750
Rear Fill:Factory (HU Power)
SUBS:2 * Apline 12" DVC type-R
Front Amp:Philips DAP4040 bridged onto each set of splits
Sub Amp:Alpine 1507

The box will make more difference that the THD of the amp. As was mentioned, 10% distortion is not unusual for a sub playing at loud levels. There is also the fact that something like a SS Tarantula will be a lot cleaner playing at 1 ohm and 1000W than a jaycar at 4 ohm and 100W, and the cost reflects this...

Back to the original q: Apparently there is a guy running a pair of 6.5 inch speakers, in ss1-2, that sounded like a pair of 12's, and hit 14x.xdB at pretty low freq's. Basically a well made speaker, from 10 to 15 inches will depend on being put in the right box, whether that is ported, sealed, or FA, and being fed a healthy dose of power. Generally free air or sealed is prefered, and 12" subs seem to be popular.

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Weaponx: "Im starting up a new team, its team "Craig David" "
bluemini: "weapon, have you been in to daddies medicine cabinet today??"
Cyberpunky: "forget the specs, and just listen to what is watt"
Ali G: "Let's increase da peace, and keep it real"

Another ANTI Team Craig David Member
Team Under Construction - You ain't heard nothin yet

also usally for SQ you go up buy 2 sizes from the previous size. eg if u have a 8" in the doors, a 12" sub. if 6" in the doors then a 10" etc. but this is not carved into stone and not always has to be followed.

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"Computer games don't affect kids; I mean if Pac-Man affected us
as kids, we'd all be running around in darkened rooms, munching
magic pills and listening to repetitive electronic music. "
-Kristian Wilson, Nintendo Inc., 1989
TEAM RWS REAL x/est side

Hmm, the same question is being debated here:
http://www.caraudioaustralia.com/ubb/Forum...TML/000041.html

In the Beginners forum. Maybe a few more ideas...

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ICQ: 104066553

thanks for the input guys

i actually have postponed my purchase of a new sub because the guy who bought my old sub and amp didnt cough up the money so im back with my original setup with a kicker impulse 12' and audioline amp

thanks again, i will post another few questios when im ready to buy a better amp

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Vk Calais Sony Jaycar Kicker Audioline Aepro

Do you guys actually think for yourselves, or just regurgitate previous information you have heard?

Any decent sub will sound just as tight, regardless of size. a 15 will sound sloppy and messy if its in the wrong box or wrong application. a 15 can sound just as tight as a 10, and 10's can go just as low, or lower than some 15's.... its all about design. i don't belive for a second that you can just categorise subs like that... its like saying a V8 will always have a better top speed but less low down acceleration that a 4cyl. its just not true for every situation, dig?

And I don't hold by that '2 sizes' thing either. if your midbass can go down to 80hz (or whatever your preference is) comfortably and can go up to 4khz or whatever your little 1" tweeter is it doesn't matter what 'size' it is, as long as it can match volume (and still maintain clarity of course) with your other components at your preferred listening level

sorry if i stepped on a few toes... no offence intended (esp mr_bob )

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HOME SYSTEM

Source - Soundblaster Live! Audigy
Sounds - Dynaudio System340
Rumble - 2xJL 10W3
Power - NAD 2200 Stereo Power amp, 2xJaycar 240wrms subwoofer amps
...VERY LOUD


[Edited 1 time by Chronos on 18 June 2002 at 23:15]

slightly off topic:

the thing u really need to think about is what you are running up front... as these are the main sound in your car...

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Team Mitsubishi Mirage
Now Enhanced With Bass
 

I loosely believed a few of the myths until I heard a JBL 1500GTi (known as the 2226 in pro audio).... and I immediately wanted to have it's babies. A 15" sub as old as time itself that is tighter than the majority of 8s while playing lower than the majority of 15s in the same enclosure? WTF?? Only catch is you need mega enclosure size, we're talking minimum of 4 cubes per sub. At 7 cubes the curve and group delay is any audiophile's wet dream. Shame we don't all drive around in Sandmans anymore.

Jambo.

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Alpine CDA-7949
Alpine PRA-H400
Alpine MRV-1000
Clarion APA4200 Powerguard
MB Quart 8/4 splits
3x Orion 2NT 12" DVC

any sub can sound good, it all comes down to box design, amplification, and most important of all, the personal listening tastes of each individual, because what one person thinks sounds bomb may ony sound alright to another, depending on how trained their ears are to varying styles of music. therefore the best idea when buying sq gear is to compile a short list of 10-12 items, and audition them personally, with material you're comfortable with

chronos, it's just my opinion man i'm happy to hear other people's opinions,
but personally i've never heard a 10" go low enough for my liking, maybe i haven't heard the right ones, maybe they weren't in the right setup.
AFAIKT it's easier to get low notes with most 15's and easier to get punchy sounds from a 10"
i'm sure the right 15 in the right enclosure can be tight, same as the right 10 in the right enclosure can go low.

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'96 Mirage
Rockford RFX9300 deck
Rockford FNP 2614 splits (soon to be rear fill)
Alpine MRP-T130s front stage amp (soon to be rear fill amp)
What?no subs?
Waiting to be installed: Focal 165W3's
Coming soon: Vrx power baybe!
TEAM "CRAIG DAVID" (You all know the chicks dig it)
Another ANTI Team Craig David Member

guys, it depends on the design of the speaker - Mr_bob, maybe all of the 10s / 15s weren't designed to sound similar..

just put a massive motor on a 15" sub, and it'll be tight - example, a dd9515, 15" CV stroker etc

and these speakers won't go as low as some 10s you may have heard either..

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- A proud member of Team Gates

that would be a higher qms? gives a tighter sound, generally speaking. i guess it would depend on the mms?


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'96 Mirage
Rockford RFX9300 deck
Rockford FNP 2614 splits (soon to be rear fill)
Alpine MRP-T130s front stage amp (soon to be rear fill amp)
What?no subs?
Waiting to be installed: Focal 165W3's
Coming soon: Vrx power baybe!
TEAM "CRAIG DAVID" (You all know the chicks dig it)
Another ANTI Team Craig David Member

mainly, a lower qes - which results in a lower qts

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- A proud member of Team Gates