Well I do have 2 x 12" Alpine Type-R's but i've noticed that the suspension on one of them is alot softer then the other? or maybe one of them is harder then the other. Would this be hindering my SPL performance due to phase relationships?

I was playing some tones below the tuning of the box (at low volume naturally) and watched, I was very surprised to notice that it is completely visible to the eye that they are very out of phase with eachother, but above tuning it is not as evident.

Wiring is 100%... have 4GA running to a twin Aeropro distro block and 12GA speaker cable from there to each coil.

Any thoughts guys?

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Car: '90 Nissan Pintara (sedan)
Headunit: JVC KD-SX750
Fronts: TotalRecoil Carsplit.6
Frontamp: Alpine MRV-T301
Sub: 2x DVC 4ohm 12" Alpine Type-R
Subamp: Lanzar 2000D
SPL: 139.5db (140db+ next time easy)
"If its not quick, may aswell make it slower"

is one much newer than the other? maybe its not run in fully yet?

I'm assuming the subs aren't wired in series or anything like that..


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- A proud member of Team Gates - A proud supporter of the CAA SPL project

quote:

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Originally posted by Bassaholic:
is one much newer than the other? maybe its not run in fully yet?

I'm assuming the subs aren't wired in series or anything like that..

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Got them 2nd hand, both off the same person but I suppose its possible that he bought each at different times.

All coils in parallel bro


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Car: '90 Nissan Pintara (sedan)
Headunit: JVC KD-SX750
Fronts: TotalRecoil Carsplit.6
Frontamp: Alpine MRV-T301
Sub: 2x DVC 4ohm 12" Alpine Type-R
Subamp: Lanzar 2000D
SPL: 139.5db (140db+ next time easy)
"If its not quick, may aswell make it slower"

are they in seperate chambers?
maybe one chamber isn't sealed as well as the other?

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'96 Mirage, currently resembling a tin can
uninstalled: Rockford RFX9300, Focal 165W3's Vrx 2.150 & 1.500
Power by: HERTZ audison OPTIMA StingerAerpro
TEAM AUDISON

quote:

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Originally posted by Mr_Bob:
are they in seperate chambers?
maybe one chamber isn't sealed as well as the other?

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Maybe swap em over with each other, to test this?

Apart from that, it sounds wierd. In general a sub needs about 1 minute to break it in initially, and about 5 seconds of playing if not played for a long time, so unless one is much older, or damaged, it should be the same.

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bluemini: "weapon, have you been in to daddies medicine cabinet today??"
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Team Digital-Is-A-Marketing-Gimic Member
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They are in a common chamber with a single port. I have had them for a few months now and have put plenty of loud music and low power burps through them so they should be worn in shouldn't they? I'm pretty sure they are both in perfect working order, just the suspension on one of them either is much stiffer then the other or one is much softer. Maybe the previous owner bought them at different times?

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Car: '90 Nissan Pintara (sedan)
Headunit: JVC KD-SX750
Fronts: TotalRecoil Carsplit.6
Frontamp: Alpine MRV-T301
Sub: 2x DVC 4ohm 12" Alpine Type-R
Subamp: Lanzar 2000D
SPL: 139.5db (140db+ next time easy)
"If its not quick, may aswell make it slower"

[Edited 1 time by Andu on 29 September 2002 at 06:08]

even if purchased at different times, i think the wearing in period and its effects on the subs should even out eventually.. especially if u have pushed them a bit off the same power..

maybe look at the box/wiring recommendations mentioned..

ive seen the same thing happen a few times. it has always been a wiring/phase problem, or a poorly sealed enclosure..

if the wiring and box is perfect, maybe one sub is actually faulty.. if a (faulty) coil heats up too much, it can 'stick' sometimes, not allowing the cone to move as freely as it should..


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MEMBER OF SINISTER MOTORSPORTS CLUB
1991 MX6 Turbo
Kenwood
MB Quart
Alpine (Selling my MRV-1005's) :(
MTX
Kicker (Sold my S12L7's) :(
2nd place: Supernats 2002 (Super Street 1-2)
148.2dB and Rising!!

Andu, I didn't want to tell you but I used one of these subs as a boat anchor for about 3 months thats probably why one isn't as flexible! !
They were both bought at the same time and boxed together facing out, both with the same amount of power into each sub. Don't know what the problem is, sounds like they could be out of phase.
Mick

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listen with your ears not your wallet

Well they managed a 145.4db burp and many other 140+ burps on sunday, so I doubt there could be any phase problems due to wiring, i'm sure one of them would of blown or scored really low if there was

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Car: '90 Nissan Pintara (sedan)
Headunit: JVC KD-SX750
Fronts: TotalRecoil Carsplit.6
Frontamp: Alpine MRV-T301
Sub: 2x Alpine SWR-1240D
Subamp: Lanzar VPro 2000D
SPL: 145.4db (Doran Test Day - 29/09/02)
"If its not quick, may aswell make it slower"

145dB?

maybe you were imagining it

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- A proud member of Team Gates - A proud supporter of the CAA SPL project

quote:

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Originally posted by Bassaholic:
145dB?

maybe you were imagining it

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Well I let some other guys have a feel of the suspension on them and one is definitely squishier then the other... might of just imagined the out of phaseness below tuning though

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Car: '90 Nissan Pintara (sedan)
Headunit: JVC KD-SX750
Fronts: TotalRecoil Carsplit.6
Frontamp: Alpine MRV-T301
Sub: 2x Alpine SWR-1240D
Subamp: Lanzar VPro 2000D
SPL: 145.4db (Doran Test Day - 29/09/02)
"If its not quick, may aswell make it slower"

the only thing I can think of, is one has been rebuilt, or is much newer than the other, and one of the parts is slightly different to the other

otherwise, I've got no idea

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- A proud member of Team Gates - A proud supporter of the CAA SPL project