JBL Bass Pro SL2 8'' Underseat Subwoofer Boombox
- 8 inch (200mm) woofer, low-profile under-seat
- 125W RMS Class D amplifier
- 35Hz to 120Hz frequency response
- 50Hz to 120Hz adjustable crossover, bass boost 0 to +9dB at 70Hz
- Line and high level inputs, 15A fuse rating
- 344 x 71 x 250 mm (W x H x D), 2.5 kg
- Wired remote, 4 screws and manual in the box
Last refreshed Oct 2, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A slim powered subwoofer that tucks beneath the driver seat, with a built-in Class D amplifier and a wired level remote. The listing names no vehicle fit list, so measure the space under the seat first.
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ASIN: B07XS4PND2Model: SUBBPSL2Category: Enclosed Subwoofer Systems
Overview
Sliding under a front seat, this JBL powered subwoofer pairs an eight inch woofer with a Class D amplifier in a low-profile ABS enclosure. A manual crossover, level control and bass boost let it be blended with the existing speakers.
A built-in amplifier and manual crossover mean a single box adds low end to a stock system without a separate amp. The limitation is size and reach, since a slim eight inch driver only plays so low, and the listing mixes in unrelated spec rows such as Bluetooth and app control.
Who it's for
Drivers with limited cabin space who want a compact add-on subwoofer fed from line or speaker-level outputs. Anyone expecting Bluetooth control should note the confusing listing, and a bigger system needs a bigger enclosure.
Pros and cons
- Low profile for under-seat fitting
- Line and high level inputs
- Adjustable crossover and bass boost
- Wired remote included
- Smaller driver limits depth
- Vehicle fit list not given
- Listing rows mention unrelated Bluetooth and app features
Performance notes
Crossover settings decide where the subwoofer hands off to the door speakers, and the level control matches its volume to them. Class D amplification runs cooler than older designs, and the high-pass filters and limiters protect the driver from overload.
Specifications
| Brand | JBL |
|---|---|
| Model | SUBBPSL2 |
| Dimensions & fit | |
| Driver size | 8 inches (200mm) |
| Dimensions (D x W x H) | 9.84 x 13.54 x 2.8 inches (D x W x H) |
| Item weight | 2.5 kg |
| Capacity & performance | |
| Maximum power | 125W RMS |
| Construction & materials | |
| Enclosure | ABS |
| Compatibility & installation | |
| Mounting | Under-seat |
| Included components | |
| Included | Subwoofer, wired bass level remote, 4 fixing screws, manual |
| Warranty & support | |
| Warranty | 1 year |
| Other details | |
| Crossover | 50Hz - 120Hz, 12dB/octave |
| Bass boost | 0dB to +9dB at 70Hz |
| Inputs | Line level 0.05V - 2V, high level 0.5V - 20V |
| Frequency response | 35Hz - 120Hz |
| Fuse rating | 15A |
| Maximum current draw | 12A |
Frequently asked questions
Will the JBL Bass Pro SL2 fit under my seat?
The description says it fits under the front seat of many vehicles but names none. Measure 13.54 x 9.84 inches of floor and 2.8 inches of height.
What comes with the JBL Bass Pro SL2?
The subwoofer, a wired bass level remote, four fixing screws and a manual.
Can the SL2 use my factory speaker outputs?
Yes. It accepts high level inputs of 0.5V to 20V as well as line level inputs.