JBL Stadium 122SSI with Sealed Enclosure

1500W Peak (500W RMS) 12" Stadium Series Selectable Smart Impedance 2 or 4 Ohm High-Performance Subwoofers

Shop all JBL
Lowest price in 30 days
Out of stock

• Peak Power: 1350W
• RMS Power: 450W
• Glass fiber & paper pulp composite cone
• Nitrile rubber surround
• Includes Sealed Enclosure

Learn more about the jblsubsd122ssiam_xmdfs121
Was $419.94 Details
Thanks , You Pay:


 with warranty

Heads up

We confirm fitment and offer accessories for speakers. Please set your vehicle first if you would like to purchase more than one jblsubsd122ssiam_xmdfs121.

Set your vehicle or Return to product page
Out of stock - Order risk-free, cancel any time.
Brand new

No Credit Option

Flexible Lease Payments

Early Purchase Options

Quick Approval Decision

Allstate logo

Keep your product protected longer! Extend the warranty after the manufacturer warranty expires. 

  • Mechanical, electrical and product failure covered! 100% parts and labor covered. (Coverage starts after Mfr. warranty)
  • Easy online management! Zero hassle claim service, Available 24/7

For over 22 years, we've been your X-Factor – the team dedicated to having the biggest impact on your shopping experience!

Award-Winning Service
FREE Shipping Orders $49+
60-Day Easy Returns
Guaranteed Lowest Price
In-House Experts



Authorized dealer

Switching up the Game

JBL believes sound quality should never be compromised and the Stadium subwoofers make sure you don’t have to compromise flexibility, either. That’s because these high-performance subwoofers feature SSI™ (Selectable Smart Impedance), an exclusive impedance switch that lets you select the optimum impedance—2 or 4 ohms—providing multiple system configurations and flexibility. A special aero-cooling design keeps the voice coil cool even at high output levels. This feature coupled with oversized voice coils increases power handling and ensures long-term reliability. More power, more reliability, more flexibility—and no compromises. When you’re ready to step up, Stadium is your subwoofer.

Go with the Flow

The Stadium’s voice coil significantly increases power handling and improves reliability by going with the flow—of air. The woofer’s motor channels air pumped by the cone movement past the voice coil, and the voice coil former exposes the coil’s inner and outer surfaces to the airflow. This aero-cooling design is unique among aftermarket subwoofers.

JBL Stadium 122SSI

1500W Peak (500W RMS) 12" Stadium Series Selectable Smart Impedance 2 or 4 Ohm High-Performance Subwoofers
Quantity: 1

Product Details:

  • 12" Dual 2 or 4 ohms JBL Stadium Series Subwoofer
  • Power Handling:
    • Peak: 1500 watts
    • RMS: 500 watts
  • Glass Fiber and Pulp/Kevlar Cone
  • Nitrile Butadiene Rubber NBR Surround
  • Aero-Cooled Voice Coil
  • Premium Integrated Terminals
  • 3" High Temperature Voice coil Material
  • 10.25 mm Xmax
  • magnet motor structure
  • Frequency Response: 25 - 175 Hz
  • Resonance Frequency (Fs): 33.8 Hz
  • Sensitivity: 92 dB
  • Sealed box volume: 1.3 cubic feet
  • Ported box volume: 2.5 cubic feet
  • Top-mount depth: 7.117"
  • Cutout diameter: 11-5/16"
  • Authorized Internet Dealer
  • Protective subwoofer grille: No
  • 1-year Manufacturer's Warranty

  • Priced Individually


Single 12” Sealed 3/4" (1.3 cubic ft) MDF Black Carpeted Subwoofer Enclosure (Made in the USA)
Quantity: 1

Product Details:

  • Single 12" Sealed MDF Enclosure
  • Holds one 12" subwoofer
  • 3/4 MDF (Medium Density Fiberboard) Construction
  • Made in the USA
  • Each Piece is CNC Cut Exact to Specification
  • Sealed Box Design
  • Durable black carpeting
  • Gold Terminals
  • Internal Box Volume: 1.3 cubic ft.
  • Dimensions: 14.5"H x 16"D x 13"W
  • Authorized Internet Dealer
  • 1-year Manufacturer's Warranty

Specifications & Details

Subwoofer Specifications
JBL Stadium Series
Subwoofer Size
Voice Coil(s)
Impedance (Per Voice Coil)
2 or 4 ohms
Final Wired Impedance
RMS Power Handling
500 watts
Peak Power Handling
1500 watts
Woofer Composition
Glass Fiber and Pulp/Kevlar
Woofer Surround
Nitrile Butadiene Rubber NBR
92 dB
Frequency Response
25 - 175 Hz
Xmax (millimeters)
10.25 mm
Subwoofer Design
Round / Circle
Enclosure Specifications
Box Type
Number of Subs/Speakers
Box Style/Shape
Wood Thickness
Number of Terminals
Terminal Type
Binding posts
Box Exterior Color
Box Finish
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider

Item Details



Model Number:

Stadium 122SSI, XMDFS121



Internal SKU:


Internal Product ID:


Customer Ratings & Reviews

5 star
4 star
3 star
2 star
1 star


Sort by:



The following review is for Stadium 122SSI, which is a part of the bundle you are viewing.

I have these in a custom built box tuned down to 30 Hertz. The box just about took up the whole big trunk in the Cadillac. Pushing them with a BAMF 5000D. They sound absolutely amazing.

By Dinky on March 1, 2022 checkmarkIcon Verified purchase


found this helpful.

Good box

The following review is for XMDFS121, which is a part of the bundle you are viewing.

Box sounds great, have it paired with a JL 12W0v3-44

By Lucas on January 23, 2022 checkmarkIcon Verified purchase


found this helpful.


The following review is for XMDFS121, which is a part of the bundle you are viewing.

Well built sub box and looks great too. For the price, you cant go wrong.

By Jay on May 2, 2022 checkmarkIcon Verified purchase


found this helpful.

JBL Never Disappoints

The following review is for Stadium 122SSI, which is a part of the bundle you are viewing.

I’ve been a JBL fan for years, I have it all, from wireless headphones to 7.2 home theater systems and soundbars, so it’s no surprise that I went with the Stadium 12s for my build. I put one 12 in a custom box at first, sat in storage for 3 years before I finally took it back out, added a second 12 and hooked my NVX 1700.1 amp. This setup hits hard ???????????? well built subs, powerful, sound quality is top notch as usual, carbon fiber cones and factory surrounds are beautiful. Jbl really went in on this one. I’m curious about the Arena X 12s, maybe next year I’ll upgrade ???? don’t tell my wife.

By Gerald on September 13, 2022 checkmarkIcon Verified purchase


found this helpful.

Decent for the price

The following review is for XMDFS121, which is a part of the bundle you are viewing.

Looks good, works good however the glue on the carpet could be better. It's been in my car for a few weeks now and I checked some things earlier and the carpet is already peeling.

By Ken on September 30, 2022 checkmarkIcon Verified purchase


found this helpful.


Similar Products

This product is temporarily out of stock. May we recommend...

NVX SMW10D4 with Sealed Truck Enclosure

• 700 watts Watts Peak
• 350 watts Watts RMS
• Carbon Fiber Reinforced Polypropylene Cone
• Butyl Rubber Surround
• Includes Depth Extension Clearance Plate
• Includes Sealed Enclosure



Infinity Reference 1000S with Sealed Truck Enclosure

• Peak Power: 800 watts
• RMS Power: 200 watts
• Polypropylene Cone
• Rubber Surround
• Impedance: Single 2 or 4 ohms
• Includes Sealed Truck Enclosure



MTX C1500C-07A

• 10" Amplified Loaded Subwoofer System
• Compatible with select 2007-2016 vehicles from GMC, Chevrolet Vehicles
• 250 Watt RMS
• Built-In Class D Amplifier


Kicker 49L7TDF122

• Single Square 12" Subwoofer Enclosure
• Forced-Air Cooling
• Enclosure Dimensions: 11 1/16" TD x BD x 12 5/8" W x 4 1/8" H



MTX Audio TNE212D Terminator Dual Subwoofer Package

• 400 watts Dual 12" Sealed Subwoofer Enclosure
• Single 4 ohms Impedance
• Spring-loaded Terminal Posts
• Enclosure Dimensions: 11-1/8" TD x 13-1/2" BD x 29-11/16" W x 14" H



Related Searches

Stadium 122SSI, XMDFS121 small

Item added to your cart.

Price: $259.99

Essential add-ons
NVX Sound Dampening Trunk Kit (SDTK20)

20 Square Feet of Sound Dampening Material (Five 18" x 32" Pieces)



Add to cart

Add vehicle

Save up to 10 different vehicles in your garage

< Back