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JBL Stadium 122SSI

Stadium Series 12" component subwoofer with switchable 2- or 4-ohm impedance

Item # 109STAD12S

JBL has been building high-performance loudspeakers for many decades, so they know something about bass.

JBL has been building high-performance loudspeakers for many decades, so they know something about bass.

California customers:
Please click here for your Proposition 65 warning.

Item # 109STAD12S

In stock
$279.95 each

60-day returns

If you don't love it, send it back.

Since 1974

Years of experience making people happy.

Hands-on research

We double check the details on each item.

About the JBL Stadium 122SSI

Quality and power

JBL has been building high-performance loudspeakers for many decades, so they know something about bass. They made their latest Stadium Series subwoofers to deliver powerful low-end punch and handle the high wattage of today's car amplifiers while giving you multiple options for installation.

Quality and power

JBL has been building high-performance loudspeakers for many decades, so they know something about bass. They made their latest Stadium Series subwoofers to deliver powerful low-end punch and handle the high wattage of today's car amplifiers while giving you multiple options for installation.

Handles up to 500 watts RMS

The Stadium Series 122SSI 12" sub handles up to 500 watts RMS, and it's optimized for use in a very small sealed enclosure. JBL uses the airflow from the internal works to cool the 3" voice coil, so you can rely on this sub to stay cool in the heat of battle. The sturdy glass fiber/paper pulp composite cone and nitrile rubber surround will stand up to all the abuses of heavy bass output.

Selectable impedance

This Stadium Series subwoofer features SSI™ (Selectable Smart Impedance), a switch which lets you vary the sub's impedance from 2 ohms to 4 ohms to optimize its effectiveness. If you upgrade your amplifier or decide to add another sub, you'll be able to adjust the 122SSI's impedance to work best with your system.

Versatile power

The terminals on this Stadium Series sub will accept up to 10-gauge wire. You'll get full power from your amp even over long wire runs, so your subwoofer will have the juice you need. See what this JBL sub can do for your system.

READ LESS

Product highlights:

  • 12" high-performance car subwoofer
  • glass fiber/paper pulp composite cone
  • nitrile rubber surround
  • stamped steel vented basket
  • SSI (Selectable Smart Impedance): 2 or 4 ohms switchable
  • power handling: 500 watts RMS (1500 watts peak)
  • frequency response: 25-175 Hz
  • sensitivity at 2.83V: 92dB
  • top-mount depth: 7.117"
  • top-mount height: 0.578"
  • sealed box volume: 1.3 cubic feet
  • ported box volume: 2.5 cubic feet
  • grille not included
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # JBLSUBSD122SSIAM

What's in the box:

  • One 10" Subwoofer
  • Screw cover trim ring
  • Adhesive-backed foam gasket
  • Eight 1" Screws
  • Owner's manual (English/ French/ Spanish/ fifteen other languages)
  • Template

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More details on the JBL Stadium 122SSI

Pat M.

Features & specs

Size 12 -inch
Impedance (Ohms) 2, 4
Cone Material Glass Fiber over Paper
Surround Material Rubber
Ideal Sealed Box Volume (cubic feet) 1.3
Ideal Ported Box Volume (cubic feet) 2.5
Port diameter (inches) 4
Port length (inches) 10
Free-Air Yes
Dual Voice Coil No
Sensitivity 92 dB at 2.83 volts
Frequency Response 25 - 175 Hz
Max RMS Power Handling 500
Peak Power Handling (Watts) 1500
Top Mount Depth (inches) 7 1/8
Bottom Mount Depth (inches) 7 1/2
Cutout Diameter or Length (inches) 11 3/16
Vas (liters) 40.48
Fs (Hz) 33.8
Qts 0.849
Xmax (millimeters) 10.25
Parts Warranty 1 Year
Labor Warranty 1 Year
The JBL Stadium 122SSI replaces these items:

Product Research

Features
Enclosure Compatibility
Specifications

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.) The power handling is the same for either setting; 500 watts RMS/1500 watts peak.

Cone: The cone material is a composite of glass fiber over a paper pulp material. Adding the glass fiber layer increases cone rigidity to improve bass accuracy, while the pulp base improves the sub's damping characteristics.

Terminal: The spring terminals will accept bare wire up to 8 gauge.

Enclosure Compatibility

Sealed Box: JBL recommends a sealed enclosure with an internal volume of 1.3 ft³. Sealed enclosures provide the most control over a woofer and provide accurate sonic reproduction, making them suitable to all types of music.

Ported Box: JBL recommends a ported enclosure with an internal volume of 2.5 ft³ using one 4" diameter x 10" long port, resulting in a tuning frequency of 35 Hz. They also recommend using a sub-sonic filter. Ported enclosures typically provide better overall efficiency than sealed so they are suitable for use with smaller amplifiers, giving you more bass output from a given amount of power.

Free-air Mounting: In addition to being compatible with sealed and ported enclosures, the woofer can be used in free-air applications. A free-air subwoofer is designed to be mounted on a baffle board, which separates the front of the speaker from the back. For instance, you could mount this woofer to a board attached to the rear deck or placed in the trunk against the rear seat. The trunk acts as the enclosure housing the subwoofer. Because there is no specific volume of air to stiffen the suspension, the free-air power handling is approximately half that of the woofer in a box, in this case 250 watts RMS.

Specifications

Thiele-Small Parameters: Because the woofer has two impedance settings, there are two sets of Thiele-Small parameters:

 
DC Resistance (Ω) 2.55 4.78
Inductance (mH) 1.382 1.267
Vas (liters) 40.48 42.83
Qms 6.225 3.581
Qes 0.983 0.945
Qts 0.849 0.748
Fs (Hz) 33.8 33.7
Radiating Area (cm²) 551.55 551.55
Xmax (mm) 10.25 10.25
Motor Force Factor (TM) 11.39 15.49

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Customer Q&A

2 questions already asked

Q
will this speaker fit in under seat in 2014 f-150?
[ tommy  Nov 25, 2022 ]
1 answer
A
Greetings Tommy, and thank you for your question. Unfortunately we do not measure under every vehicles seats. The JBL122S SI is a pretty deep subwoofer at 7.117 inches deep, and factor in the needed box adding another 1.5 inches you would need 8.5-9 inches of clearance under the seat.
[ Thomas J.  Nov 26, 2022 ]  Staff

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