Get maximum from JBL P1222 subwoofer

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=87076
Printed Date: May 10, 2025 at 3:47 PM

Topic: Get maximum from JBL P1222 subwoofer

Posted By: miniiso
Subject: Get maximum from JBL P1222 subwoofer
Date Posted: December 12, 2006 at 12:24 PM

Hello, last week i got brand new subwoofer - JBL P1222
i have also amplifier from power series - JBL BPX2200.1, some monster cables and Batcap...

I want discover, whats the limits of this nice SW..How much dB SPL i can get from this one in right "SPL" enclosuer...

Could someone help me design the ultimate SPL box?
Many thx for answers posted_image

mini ISO

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Replies:

Posted By: jeffchilcott
Date Posted: December 12, 2006 at 5:40 PM

what type of vehicle? What organization do you plan to run and test this SPL setup in?

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place

Posted By: miniiso
Date Posted: December 13, 2006 at 11:49 AM

jeffchilcott wrote:

what type of vehicle? What organization do you plan to run and test this SPL setup in?

Hello, I want to compete in dBDRAG...so I want to be prepared for sine test tone around 50-60Hz..idk..

Recommended vented enclosure volume is 1,75ft3 (49.56liters) and port length 277mm (10-3/4") and diameter 102mm (4"), but im not sure, if with this solution i got maximum from this SW...

THIELE-SMALL PARAMETERS of JBL P1222 DVC

VOICE COIL DC RESISTANCE : R EVC (OHMS ) . . . . . . 1.00

VOICE COIL INDUCTANCE @ 1KHZ: LEVC (MH) . . . . . . . 1.10

DRIVER RADIATING AREA : S D

(IN 2) . . . . . . . . 87.11
SD . . . . . . 562.00
MOTOR FORCE FACTOR : B L (T M) . . . . . . . . 10.00
COMPLIANCE VOLUME : V AS (FT 3) . . . . . . . . 1.53
VAS (LITERS ) . . . . . 43.30
SUSPENSION COMPLIANCE : C MS (µ M/N) . . . . 96.00
MOVING MASS , AIR LOAD : M MS (GRAMS ). . . . 323.00
MOVING MASS , DIAPHRAGM : M MD (GRAMS ) . . . 315.80
FREE -A IR RESONANCE : F S (H Z) . . . . . . . . 28.60
MECHANICAL Q: Q MS . . . . . . . . . . . 9.04
ELECTRICAL Q: Q ES . . . . . . . . . . . . 0.58
TOTAL Q: Q TS . . . . . . . . . . . . 0.55
MAGNETIC -G AP HEIGHT : H AG (IN ) . . . . . . . . 0.48
HAG (MM ) . . . . . . . 12.00
VOICE -C OIL HEIGHT : H VC (IN ) . . . . . . . . 1.58
HVC (MM ) . . . . . . . 40.00
MAXIMUM EXCURSION : X MAX (IN ) . . . . . . . . .56
XMAX (MM ) . . . . . . 14.00

Many THX for replys

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Posted By: miniiso
Date Posted: December 13, 2006 at 11:56 AM

oh...and it goes to Peugeot 206, small car :-)

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I like this forum

Posted By: jeffchilcott
Date Posted: December 13, 2006 at 12:52 PM

untill I can look into what one of these cars look like, I will only be able to offer limited help.

Is this a trunk car or hatchback?

If hatch go with a box 1.25-1.5cuft internal with (2) 4 by 12 in ports

I prefer Actual Aero-POrts, I know some companys in finland and germany carry them but dont know about down there

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place

Posted By: geepherder
Date Posted: December 13, 2006 at 3:55 PM

Those are small hatchbacks- about the size of a Civic Si or a Ford Focus.

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My ex once told me I have a perfect face for radio.

Posted By: miniiso
Date Posted: December 14, 2006 at 3:15 PM

jeffchilcott wrote:

untill I can look into what one of these cars look like, I will only be able to offer limited help.

Is this a trunk car or hatchback?

If hatch go with a box 1.25-1.5cuft internal with (2) 4 by 12 in ports

I prefer Actual Aero-POrts, I know some companys in finland and germany carry them but dont know about down there

Wow man,you are excellent in this...Win ISD now show me with this parameters +16,2dB gain @ 56Hz...wow, excelent one, many thanks...

only one question..can I place airport (round shaped) into top of box? or better place is front wall?

and damping material?should i use?

Many thanks i love you

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:-)

I like this forum

Posted By: jeffchilcott
Date Posted: December 14, 2006 at 5:22 PM

in that car, I would suggest subwoofer firing up. and ports firing back towards the tail lights

Have the box almost all the way towards the drivers side as well.

Hope this helps, let us know how you do!

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place

Posted By: jeffchilcott
Date Posted: December 14, 2006 at 5:24 PM

I would suggest tyring to stay away from dampining material. I have knows alot of people who try to use it in competing....then they end up losing, and never get back what they lost.

Some cars it helps, others it hurts.

If you want to try, start in small areas and find someone with a meter to test with to see if it gains or loses

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place

Posted By: miniiso
Date Posted: December 15, 2006 at 10:44 AM

Many many many thanks goes to you :-)
I dont know how to expres my enthusiasm that you helped me
THANKS and BIG RESPECT

Posted By: jeffchilcott
Date Posted: December 15, 2006 at 12:26 PM

no problem, if you have any other questions feel free to ask, or PM me.

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2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place