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JBL BassPro SL

8" compact powered under-seat subwoofer enclosure

Item # 109BASPROS

The smaller the subwoofer enclosure, the more places it can go.

Read more from Crutchfield writer, Bob B.

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About the JBL BassPro SL

JBL +  compact sub

The smaller the subwoofer enclosure, the more places it can go. And with cars getting smaller every year, the need for compact powered subs is greater than ever. Now JBL introduces their Bass Pro SL powered sub, and it's ready to go where no sub has gone before.

JBL +  compact sub

JBL BassPro SL 8" powered under seat enclosure

Under the seat is the Bass Pro's natural habitat.

The smaller the subwoofer enclosure, the more places it can go. And with cars getting smaller every year, the need for compact powered subs is greater than ever. Now JBL introduces their Bass Pro SL powered sub, and it's ready to go where no sub has gone before.

JBL's Bass Pro SL powered sub delivers impressive bass from a stealthy low-profile enclosure that'll fit under the seat in many vehicles. Its 8" shallow-profile woofer was designed especially for this compact enclosure, so you know you'll be hearing some strong bass.

Tight spots? Sure!

The Bass Pro SL uses a Class D amplifier that delivers 125 watts RMS to the sub; the amp hardly gets warm when it's working, so you don't have to worry about installing the Bass Pro SL under your seat or in some other tight space.

 The Bass Pro SL includes line- and speaker-level inputs with an input load switch. The amp's controls also include adjustable crossover frequency and bass boost.


Product highlights:

  • powered subwoofer with heavy-duty ABS plastic enclosure
  • 8" shallow-profile woofer
  • Class D amplifier (125 watts RMS)
  • low-pass crossover variable from 50-120 Hz at 12 dB per octave
  • bass boost (0 to +9 dB at 70 Hz)
  • speaker and line-level inputs
  • frequency response: 35-120 Hz
  • dimensions: 13-9/16"W x 2-7/8"H x 10-1/16"D
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # BassPro SL

What's in the box:

  • Amplified subwoofer
  • 20-amp ATO fuse (installed)
  • 7" Speaker level input harness
  • Four 2-1/2" Mounting screws
  • 3mm Allen head bit
  • Quick start guide

Customer reviews

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JBL BassPro SL Reviews

Average Customer Review(s):

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Crutchfield response

More details on the JBL BassPro SL

Features & specs

Enclosure Type Sealed
Finish Material ABS
Grille Steel
Connector Type RCA/Harness
Bi-amp Inputs No
Woofer Size (inches) 8
Woofer Material
Passive Radiator ---
Width 13-9/16"
Height 2-7/8"
Depth 10-1/16"
Second Depth N/A
Parts Warranty 1 Year
Labor Warranty 1 Year
Frequency Response 35-120
Amplifier Power (RMS) 125 watts
Maximum Wattage N/A
Sensitivity N/A
Impedance N/A
Second Voice Coil Impedance N/A
Crossover Point 50-120

Product Research


Mounting: The subwoofer, with its height of 2-7/8", can be mounted flat under a seat in the passenger compartment of many vehicles.

Auto Turn-On: When the speaker level inputs are used, the system can automatically turn on and off by sensing the voltage on the speaker input. If you prefer, auto turn-on can be turned off, so the amp turns on/off using the wired remote terminal.

Note: The auto turn-on feature does not operate when the preamp level inputs are used.

Low-Pass Crossover: The low-pass crossover slope is 12dB/octave and the crossover point is variable from 50 Hz to 120 Hz.

Bass Boost: The amplifier includes a continuously variable bass boost circuit, 0 dB to +9 dB centered at 70Hz.


  • Power: the power (+12V), ground, and remote turn-on connections are on a terminal strip; each screw terminal is approximately 0.34" wide; JBL recommends 12-gauge (minimum) power and ground wires
  • Line Level Input: left and right female RCA preamp level inputs
  • Speaker Level Input: 4-pin port for the included speaker input harness
  • Fuse: 20-amp ATO fuse installed
  • Remote: RJ-14 jack for an optional wired remote (item number 108RBC, sold separately)


  • Audio Sense: two position switch; set to On when using speaker level inputs to engage the auto turn-on circuit
  • Input Load: two position switch, active only when using speaker level inputs; offers compatibility with a wide range of aftermarket and factory radios
  • Crossover: rotary control; sets low-pass crossover point; continuously variable from 50 Hz to 120 Hz
  • Phase: two position switch; select normal (0°) or reverse (180°)
  • Level: rotary control; gain variable from 200mV to 2V when using line level inputs, 2V to 20V when using speaker level inputs
  • Bass Boost: rotary control; bass boost level variable from 0dB to +9dB, centered at 70Hz

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Customer Q&A

Crutchfield asked: Why did you buy this?
I chose the JBL compact sub because of the JBL sound reputation and I own some of their other products. Thanks again Bill and Crutch Crew! [ Walter O.  Mar 09, 2019 ]
Low profile / right size, good brand and the right price point [ Jason  Feb 22, 2019 ]
Wanted to still have space without compromising the size of the vehicle considering it's a small car!:) [ Augustine Joshu  Feb 14, 2019 ]
I purchased the Sound Ordnance powered subwoofer last year. I had it replaced three times due to it failing to work ;( After the third one failed (last night), I decided to get the JBL because it's a better brand and the wiring setup is practically identical to the first. [ PASHA  Jan 18, 2019 ]
Hulk Hogan has 2, i figured I could manage 1 [ Hays  Aug 14, 2018 ]
Advisor recommended [ Carl  Jul 26, 2018 ]
Replacing my Sound Ordnance B-8PTD. I was on my second one in 4 years. Each one really only worked 100% of the time for 6 months. I'm hoping this JBL will last a little longer and sound a little better. If you are thinking about getting a Sound Ordnance, read the reviews and search the web. There are allot of people who had the same problem I did. They work for a while and then quit. The wiring on the JBL is identical to the SO, so I'm hoping it will be plug and play. [ Thomas  May 30, 2018 ]
I chose this sub mostly on the reviews and on the JBL name & reputation. Im not looking for huge loud bass, just something to round out my stock system. [ JAMES  May 16, 2018 ]
The sound ordnance sub woofer we bought did not last one year. Each one that was replaced also failed within one year. That is a poor product and am trying something we hope is more reliable. Your customer service is still excellent! I have been a customer since 1994!!! Thanks [ O  May 14, 2018 ]
this is just what a 2017 f150 reg cab needs [ fred  Apr 23, 2018 ]
for eaasy fit [ C  Apr 14, 2018 ]
Hope it fits under my seat. [ Horace  Apr 05, 2018 ]
Love it [ nelson  Sep 11, 2017 ]
I have one and it is a nice compact sub with good sound [ DAVID N  Jun 20, 2017 ]
Looked like the best buy for what I want. [ Robert  May 04, 2017 ]
Don't need more cowbell, need more BASS! [ Kenneth  Mar 04, 2017 ]
I choose JBL personally because they sound good. :) [ Loyd  Sep 24, 2016 ]
This item is a gift for my fiance'. He has always ordered audio equipment from Crutchfield and has been satisfied with his purchases. [ Brenda  Aug 31, 2016 ]
small compact. we will see how it is when i install it. [ steven  Jun 19, 2016 ]
my second jbl power sub the best sound out there! [ robert  Apr 30, 2016 ]
To fit under seat in cargo van used for working out of. So that speaker will not be in the way of cargo and tools. [ Jason  Mar 22, 2016 ]

9 questions already asked

can this be wired into an existing stock system, using line-level inputs and just a power line? i.e. will it be triggered to turn on by the speaker level signal coming into it? I can easily run a power cable but the power trigger (like I have in my other vehicle with an after market head unit) will be impossible.
[ hot ham water  Dec 19, 2018 ]
2 answers
I had this wired into a stock chevy silverado 2014. I had to run a wire to a switched hot from the fuse box to get it to work correctly. Was easy and if you have to run power anyway should be pretty easy
[ THOMAS  Jan 02, 2019 ]
When using the line level input you will need to hook up keyed power input. From the head unit OR a key-on power source. (As per the instructions) , My factory head unit has no power wire to turn on anything so I tapped into a keyed on source. Great little unit.
[ Alex  Dec 31, 2018 ]
Can this powered sub mount under the seat of a 2011 jeep wrangler 2 door?
[ John  Oct 19, 2018 ]
2 answers
Sorry, really don't know. Mounted mine in the back to the side panel.
[ Alex  Oct 20, 2018 ]
Not really sure of the clearance under a Jeep seat. Fits under the seat of my 2017 Honda Accord.
[ Steven  Oct 19, 2018 ]
Can this unit be mounted upright, say like on the back wall of a reg cab pickup behind the seat? dont want to take up floor space.
[ Nils  Jul 11, 2018 ]
3 answers
I think it could be done, but you would want to mount it to steel, not just the plastic covering it. Then you would likely have screws sticking out the back of the cab, so screw length would have to be watched so as not to get into the bed or against it.
[ Kenneth  Jul 11, 2018 ]
Yes it can
[ DAVID N  Jul 11, 2018 ]
Yes, it has four counter sink screw holes for mounting.
[ EG  Jul 11, 2018 ]
Does this come with everything needed for installation?
[ Boots  May 22, 2018 ]
2 answers
You also need to purchase a sub woofer install kit which has the power wire and fuse.
[ Michael  May 29, 2018 ]
You will need to purchase an installation kit which includes your power cable and ground cable as well as a fuse
[ DAVID N  May 29, 2018 ]
The JBL system in my camry 2014.5 has only 1 rear deck subwoofer. Can I use that single channel to this JBL Basspro SL subwoofer and place this under the seat? Thank you.
[ joeykryzl  Apr 28, 2018 ]
1 answer
It has line level inputs so I would think it should. I didnt connect mine that way so cant be 100% positive. Try to find the manual for it online and check it. I think you can do that here.
[ Kenneth  Apr 28, 2018 ]
Does this unit come with the remote bass control? Is it needed/recommended for (optimal) use? Thank You!
[ mike  Mar 24, 2018 ]
3 answers
It does not have a remote bass control knob. But you can turn in up on the device if need be.
[ Michael  Mar 25, 2018 ]
It does mot. I have mine in a 05 GMC ext cab Sierra. The rear set is up 99% of the time and found once I got it set I have not had to adjust. I was not looking for a lot of bass, just to pick it up a little. This unit filled that need.
[ David  Mar 24, 2018 ]
I believe the remote is optional. I used it in a small truck cabin and found that it was better to get the crossover and amp settings at a comfortable spot and make any further adjustment from the head unit
[ Matthew  Mar 24, 2018 ]
I have a 2017 Tacoma double cab. Can this subwoofer be put behind the the rear seat in the compartment that the Tacomas have and still hear the bass?
[ Hans  Sep 29, 2017 ]
3 answers
The bass will travel though out the car . I have one and it sounds great.just make sure it will fit measure it with the measurements they give you in the description.
[ Smokey  Oct 09, 2017 ]
I have one under my seat in a Sierra. It can be mounted onto a flat service as long as there's ample room. Crutchfield should have the dimensions. I'm guessing it's 2.5 inches thick, give or take. As for Sound. 24 year old me would not have been satisfied with the output. Not by a mile. 44 year old me appreciates it for what it is. A cost effective way to get some gentle bump out of a factory stereo. Hope this helps. As for
[ CHRISTOPHER D  Oct 02, 2017 ]
I have purchased two of these. One is in the trunk of a car and the other is under the passenger seat of a Jeep. The bass has not been diminished in either location. I am not sure of the Tacoma's layout but cannot see you having any issues with this item.
[ DAVID N  Oct 02, 2017 ]
Hi Can this subwoofer shows himself (have a enough bass and rms) in front of alpine spr 69 and spr 50c ? I am just looking for a depth and decent bass and vibration.and which wire gauge should i use for connecting to the battery? Thanks
[ H  Sep 17, 2016 ]
1 answer
Much would depend on the amplification you're using to power the Alpine speakers. The JBL BassPro SL will not overpower any full-range speakers but you should be able to appreciate the better bass response it provides for your system. We recommend using 10 gauge power/ground leads for this sub. I hope that helps. My Bio:
[ Ryan  Sep 24, 2016 ]  Staff
Can this be used to replace the pioneer subwoofer under the passenger seat of a 1999 Lexus RX300?
[ gp99RX300  Jun 03, 2016 ]
1 answer
This is for all of the available compact subs, I would recommend to contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle, compare the different subs available and give you the details on if they will fit and what you will need for an installation in your vehicle.
[ Kenny  Jun 03, 2016 ]  Staff

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