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JBL S2-1224

Series II 12" component loudspeaker with switchable 2- or 4-ohm impedance

Item # 109S21224

Since JBL first began manufacturing audio equipment in 1946, they've always emphasized quality.

Since JBL first began manufacturing audio equipment in 1946, they've always emphasized quality.

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Item # 109S21224

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About the JBL S2-1224

Quality and versatility

Since JBL first began manufacturing audio equipment in 1946, they've always emphasized quality. Their Series II subwoofers also put the spotlight on adaptability, with the ability to vary the sub's impedance with the flip of a switch.

Quality and versatility

Since JBL first began manufacturing audio equipment in 1946, they've always emphasized quality. Their Series II subwoofers also put the spotlight on adaptability, with the ability to vary the sub's impedance with the flip of a switch.

JBL S2-1224 12" Component Subwoofer

The handy impedance switch eliminates the need to rewire your system when you add a second sub.

Selectable impedance

JBL's Series II S2-1224 sports a 2” diameter voice coil for exceptional power handling, while airflow from the cone's movement cools the voice coil for increased reliability. The sub's Selectable Smart Impedance (SSI™) switch allows you to change impedance from 2 ohms to 4 ohms, so you can optimize the sub for your system and the amplifier. This feature makes it easy to reconfigure your system when you add another Series II subwoofer or upgrade your amplifier.

This sub features a polypropylene cone for enhanced stiffness and an nitrile rubber surround for additional smoothness and responsiveness, while the stamped steel basket adds rigidity and its vented construction helps keep things cool. The S2-1224 handles up to 275 watts RMS (1100 watts peak), and works equally well in sealed or ported enclosures, another example of its versatility.

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Product highlights:

  • 12" component subwoofer
  • switchable 2- or 4-ohm impedance
  • polypropylene cone
  • nitrile rubber surround
  • power handling: 275 watts RMS (1100 watts peak)
  • frequency response: 25-175 Hz
  • sensitivity (2.83V at 1 meter): 93 dB
  • mounting depth: 6-1/2"
  • mounting height: 11/16"
  • sealed box volume: 0.75 cubic feet
  • ported box volume: 2.5 cubic feet
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # S2-1224

What's in the box:

  • One 12" Subwoofer (with impedance switch)
  • Owner's manual

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Features

Selectable Smart Impedance (SSI): A switch on the input terminal allows you to easily change the woofer's impedance between 2Ω and 4Ω settings. (The connected amplifier should be off when changing the impedance.)

NBR Surround: Nitrile butadiene rubber (NBR) is a synthetic rubber, well-suited for automotive woofer surround applications. It is durable, can withstand a wide range of temperatures (-40 to 226 °F), and is resistant to breakdown due to UV light exposure.

Enclosure Recommendations:

  • Sealed Box Volume: 0.75 ft³
  • Ported Box Volume: 2.5 ft³ with one 4" diameter x 11.7" long port (tuned to 30 Hz)
  • Infinite Baffle: The woofer can also be mounted in free air to a baffle board (no enclosure). When mounted in free air, the power handling is lowered to 125 watts RMS.
  • Band Pass: A prefabricated band pass enclosure is also mentioned in the manual as acceptable, but no specific size or tuning recommendations are listed.

Thiele-Small Parameters: Some of the parameters change based on the impedance setting:

 
Re (Ω) 2.00 4.40
Le (mH) 1.20 0.81
Sd (cm²) 522.80 522.80
Bl (Tm) 10.30 13.90
Vas (liters) 61.20 59.70
Fs (Hz) 31.90 32.40
Qms 4.64 3.02
Qes 0.59 0.72
Qts 0.52 0.58
Xmax (mm) 10.25 10.25

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Customer Q&A

Q
Crutchfield asked: Why did you buy this?
A
On sale ?? [ Race  Aug 28, 2019 ]
A
Sale price and reviews [ Ranay  Aug 22, 2019 ]
A
Cause it rocks [ Scott  Aug 13, 2019 ]
A
JBL series II can't go wrong with them! perfect match for an Alpine amp MVr500 [ Daniel  Jul 23, 2019 ]
A
it was on sell [ wayne  May 10, 2019 ]
A
I only need a decent sub for my daily use i guess JBL is a good brand [ James  Mar 15, 2019 ]
A
Use these JBL's tree place the woofers in my ESS towers they sound extremely good [ John  Feb 19, 2019 ]
A
least expensive [ denny  Jan 31, 2019 ]
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3 questions already asked

Q
what kind of box would you recommend for this sub?
[ Jordan  Mar 15, 2017 ]
1 answer
A
This sub can be used in either a sealed (0.75 cubic feet airspace) or ported (2.5 cubic feet airspace) enclosure. The choice is entirely up to you: https://www.crutchfield.com/learn/sealed-or-ported-subwoofer-enclosures.html?search=sealed I hope that helps. My Bio: https://www.crutchfield.com/Support/Bio.aspx?bio=5
[ Ryan  Mar 23, 2017 ]  Staff
Q
Is the JBL S2-1224 an SVC or DVC subwoofer?
[ A  Jul 07, 2016 ]
1 answer
A
Thanks for your question. This product is a SVC. On the product page "Details" tab you'll find this information under "Features and Specs", it is listed as: Dual Voice Coil=No. Hope that helps.
[ Kenny  Jul 08, 2016 ]  Staff
Q
Could I use this as an open air sub in a car? I'm considering mounting it to the rear deck.
[ Aaron  May 22, 2016 ]
2 answers
A
It would physically mount but the sound quality would be poor bc it needs a proper inclosure with the recommended air space to sound properly JBL recommends around 2.5 cu ft.. I personally would avoid at all cost in that manner... On the other hand, using the recommended inclosure space makes this sub sound amazing therefore I wouldn't vary far from mfg specs.. Good luck
[ Channing  May 24, 2016 ]
A
I would suggest not doing that. This SUB is desidned to be used in a baffle. It is designed to work with the back pressure produced in a sealed and ported box. Your rear deck or trunk does not provide that inviorment.
[ gordon  May 23, 2016 ]

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