JBL P1224

Power Series 12" subwoofer with dual 4-ohm voice coils

  • JBL P1224


  • JBL P1224


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Item #: 109P1224

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Our take on the JBL P1224

by Ken Nail

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Do you want maximum performance from your subwoofer? JBL puts Plus One technology to work in the Power Series P1224 12" sub — a deeper cone and taller surround produces more effective cone area than on a standard 12" subwoofer, for more efficient operation and bigger bass output.

The P1224's high-tech cone combines Kevlar and paper into a combo that's strong, light, and ready to lay down the lows without distracting distortions. A sturdy die-cast frame and reinforced internal parts ensure reliability you can count on for the long haul.

Note: If you are wiring this DVC sub for lower impedance, make sure that your amp is compatible. Most 2-channel car amplifiers are stable down to 2 ohms in standard mode, or 4 ohms in bridged operation. Most mono amps are stable down to 2 ohms.

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  • 12" subwoofer with dual 4-ohm voice coils
  • Kevlar-impregnated paper cone with Hi-roll rubber surround
  • Plus One cone design for more effective surface area
  • power range: 50-400 RMS watts (200 watts per coil)
  • 1600 watts peak power handling
  • frequency response: 23-450 Hz
  • sensitivity: 94 dB
  • mounting depth: 6-13/16"
  • sealed box volume: 1.00 cu. ft.
  • ported box volume: 1.75 cu. ft.
  • warranty: 1 year
  • Our 60-day money-back guarantee

Priced per speaker

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Size 12 -inch
Impedance 4 ohms
Cone Material Kevlar-impregnated paper
Surround Material Rubber
Ideal Sealed Box Volume (cubic feet) 1
Ideal Ported Box Volume (cubic feet) 1.75
Port diameter (inches) 4
Port length (inches) 10.75
Free-Air No
Dual Voice Coil Yes
Sensitivity 94 dB at 2.83 watts
Frequency Response 23 - 450 Hz
RMS Power Range (Watts) 50-400
Peak Power Handling (Watts) 1600
Top Mount Depth (inches) 6 13/16
Bottom Mount Depth (inches) N/A
Cutout Diameter or Length (inches) 10 13/16
Vas (liters) 54.6
Fs (Hz) 27
Qts 0.54
Xmax (millimeters) 14
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • 12" Dual voice coil subwoofer
  • Self-adhesive foam gasket
  • Owner's Manual
  • Technical Data sheet
  • Warranty card
  • JBL decal

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team — they open the box, verify contents, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.


Plus One Cone: The JBL Power Series subwoofers feature Plus One woofer cones. Each Power Series subwoofer features more cone area than comparable subwoofers of the same size. This increase in cone area means an audible increase in bass output and efficiency.

Woofer Materials: The woofer has a Kevlar-impregnated paper cone. This combination of materials has a high strength-to-weight ratio for higher sensitivity, and adds stiffness for a more accurate bass response.

Die-Cast Frame: The thick wall construction of the die-cast frame offers maximum rigidity to support the heavy motor structure of the speaker, and ensure the motor structure stays centered in the voice coil gap. The frame is fully vented to provide maximum movement of air behind the cone and spider.

Stitched-in Tinsel Leads: The tinsel leads are stitched into the spider in two places to greatly enhance reliability and eliminate audible tinsel lead slap.

Dual 4-ohm Voice Coils: For increased system flexibility, the woofer has two 3" 4-ohm voice coils. When the voice coils are wired in parallel with each other, the woofer presents a 2-ohm mono load. When the voice coils are wired in series with each other, the woofer presents an 8-ohm mono load. In addition, each voice coil may be connected to a different amplifier channel and each channel will see a 4-ohm load.


Recommended Sealed Box Volume: JBL recommends a 1.0 cu/ft sealed enclosure.

Recommended Ported Box Volume: JBL recommends a 1.75 cu/ft ported enclosure. One 4" diameter x 10-3/4" long port, tuned at 33Hz, should be used with the 1.75 cu/ft enclosure.

Recommended Bandpass Box Volume: JBL recommends a bandpass enclosure with a 1.0 cu/ft sealed rear chamber and a 1.75 cu/ft front ported chamber. Two 4" diameter x 7" long ports, tuned at 55Hz, should be used with this enclosure.

Power Handling: The woofer has two 4-ohm voice coils, and each voice coil can handle up to 200 watts RMS (800 watts peak).

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JBL P1224 Reviews

Average Customer Review:

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5 out of 5

Outstanding, the thing is a beast.

Written By Cattskinner, S.E. Idaho on Thursday, June 02, 2011
I have one of these in a Q-Logic 1.0 cubic foot sealed box, that I dynamatted a little as well, running it in parallel of an Infinity 5-channel D-class. It is getting 300 watts RMS, paired with two pair of 6 1/2's (JBL P662's and Infinity Kappa's). I'm an old audiophile, former rock/Jazz/Classical musician and always something of a self-styled sound engineer, and this thing impresses the hell out of me. The 6 1/2's have 75 x 4 going to them and it more than balances them out. Excellent clarity, REALLY solid ; I am NOT into the boom-car thing, but the ol' Sportage sure thrums when I crank it. The bass is really, really balanced and transparent. I plan to add another (well, the 1222) as the sub for a satellite system in the house, with an 800 watt QSC Pro amp bridged into it @ 4 ohms ... I'll let you know how that works out :)
1 out of 3 people found this helpful
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5 out of 5

Home theater use

Written By jb, Wichita, KS on Monday, January 31, 2011
Crutchfield Customer Review (What's this?)
Have had the 1224 now for 2 yrs. Use a RA500 bridged to 500 watts RMS @ 8 ohms to power. Built my own box to specs via JBL (ported). Room is approx. 800 sq feet. More than enough bass for both home theater use (loose) and music (tight).
1 out of 2 people found this helpful
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2 out of 5

rather disappointed

Written By son, lacey wa on Sunday, September 12, 2010
i got mine on sale and i still feel i payed too much.... i'd say this is only an average sub... on about half the music i listen to it sounds pretty good... nice and loud... and then other songs it'll only put out half the volume when i know it can be much louder from hearing it bump other songs... forget listening to any of the faster metal with this. anyhing with a fast double bass pedal and everything will just sort of muddle together without distinct kick to each drum into one ugly tone because this sub can't respond fast enough another thing this sub bottoms out way too much... my old rockford fosgate p3 could play much lower tones than this... the basket size is ridiculous also

i regret getting this sub... i should have just gotten another p3
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4 out of 5

JBL P1224

Written By texastechguy, Houston Tx on Tuesday, October 06, 2009
Crutchfield Customer Review (What's this?)
I have one of these subs connected to an Eclipse M1000 Class D amp, in a sealed box. I can rumble my car!

I have a friend with 2 JL L7's perfectly tuned being pushed by an old school mephis amp, old cheata amp. My one JBL performed equally to his 2 subs all the way. Believe me or not I was impressed myself.

I Just ordered one more of these, going to connect it to a JBL 1200.1-Z Class D amp. Cant wait.

Pros: The best value around, massive output, good price, nothing else for the price even comes close. I would choose these subs over even most of the 300-400 subs.

Cons: Hudge basket- Custom box needed, RMS power is under rated. They need more power, at least 600RMS (300 a coil over the recommended 200)

Source: My amp pushes 480 True power and still clips cus it cant push enough power, and have constant 13.9 V even when hitting hardest, its getting plenty of power.
7 out of 10 people found this helpful
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5 out of 5

needs custom box

Written By Kaushal, chicago on Wednesday, July 30, 2008
Nice sub that sounds great. As far as comparisons go, i would put them somewhere between a jl w3 and w6 (closer to the w3). They are better than the type r's by a long shot but not as good as the type x's. Comparable to the boston g512's. Comparable to kicker l5's, almost as loud, but a lot lot lot cleaner sounding. They are also well priced for what you get and the subs that they can compete with. Sorry not that familiar with fosegate, or mtx. Just going by other subs i've installed or owned.
I have two running on an alpine pdx-1.1000. Handle the power like champs. I've had them in both sealed and ported enclosures to jbl's specs. They sound great in both but I prefer them in a sealed enclosure because of the SQ and box size requirement differences.
Now here's the cons.... They are really heavy, oversized, and they require custom enclosures to accommodate the close to 15" frame.
Overall I give them a 5 out of 5 stars because of the SQ and SPL they put out. Besides even after making a custom box, these still end up being cheaper than comparable subs.
16 out of 17 people found this helpful
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3 out of 5

not too bad

Written By bang2loud, youngstown, ohio on Wednesday, July 16, 2008
i had 2 of these and blew them in just a day i was putting 600 watts on them got a new set and they lasted a about a year until i traded them in for a pair of rockford fosgates t212d4 my old amp was a rockford 2007 punchseries amp 1000-1bd not a bad amp i traded it for a t seies 1500-1bd these woofers are very oversized had to get a custom box it cost 200 dollars and weighs over 75 pounds
1 out of 19 people found this helpful
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4 out of 5

JBL P1224

Written By ray, Long Island on Friday, September 14, 2007
These are some of the most sensitive subs on the market, they make a ton of volume with very little wattage. Be warned, they are basically a 15 inch sub with a basket to fit into a 12 inch hole. They will not fit into anything short of a custom made box or a RTI box. After spending a night building a box exactly to JBL's specs as far as porting and volume, these subs were impressive. With about 75watts apiece, they managed to rumble my car, fog my mirrors, and just generally punch. They are very punchy in a ported box, and still have nice deep bass when called for. With just 150watts to 2 of these subs in my trunk, they are nearly as loud as the 07 kicker cvr box with 900watts to it. More than worth the purchase if you have the resources to make your own box, just beware that they are near 15 inches across and stick out nearly 3 inches from the box.
24 out of 26 people found this helpful
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5 out of 5


Written By Tony, Andover, MN on Monday, June 26, 2006
I have 2 12" brand new P1222's, a little different but THEY BUMP SO MUCH!!! This sub is a great product, got it hooked up to a 1440 amp and a 5.0 Farad cap. Custom box for these oversized subs and they are GREAT!!!
64 out of 72 people found this helpful
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T-Spec 12-gauge Speaker Wire Black/white jacket — priced per foot
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T-Spec 16-gauge Speaker Wire Black/white jacket — priced per foot
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Stinger PRO Series 16-gauge Speaker Wire Black jacket — priced per foot
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Dynamat Xtreme Wedge Pack 1 sheet, 4 square feet
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Dynamat SuperLite Tri-Pak Triple package — 3 sheets, 12 square feet (Model #10612)
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Dynamat Xtreme Trunk Kit 5 sheets, 20 square feet
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Dynamat Dynaliner One 54" x 32" sheet (1/8" thick)
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Metra Speaker Terminal Square terminal cup with binding post connectors (for do-it-yourself box builders)
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Metra Speaker Terminal Round terminal cup with binding post connectors (for do-it-yourself box builders)
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Metra Speaker Terminal Round terminal cup with spring clip connectors (for do-it-yourself box builders)
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Metra Box Carpet Carpet roll (54" x 5 yards) — available in 3 colors (Silver)
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