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Infinity BassLink SM

8" compact powered under-seat subwoofer enclosure

31 Reviews | 12 questions - 23 answers

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Our take on the Infinity BassLink SM

Cars are getting smaller every year, and we've really noticed an upswing in the popularity of compact powered subwoofers. Now Infinity weighs in with their BassLink SM powered sub, and it'll deliver quality bass from spaces where you never thought a sub could go.

Infinity's take on a compact sub

Cars are getting smaller every year, and we've really noticed an upswing in the popularity of compact powered subwoofers. Now Infinity weighs in with their BassLink SM powered sub, and it'll deliver quality bass from spaces where you never thought a sub could go.

Infinity BassLink SM 8" powered under seat enclosure

The BassLink SM can deliver powerful bass from under your seat.

Infinity houses the BassLink SM in a slim-profile enclosure that's small enough to fit under the front seat in many vehicles. They designed the 8” shallow-profile woofer specifically for this compact enclosure, so you can count on superior efficiency and performance.

Made for tight spaces

The BassLink SM delivers 125 watts RMS to its sub with a Class D that hardly gets warm when it's working, so there's no worry about installing the BassLink SM  under your seat or in some other tight spaces.

The amp features a choice of controls to help you define your sound, including adjustable crossover frequency and bass boost. The BassLink SM also features low- and high-level inputs with an input load switch.

So deliver more bass to your space…with the Bass Link SM, you've got room for the boom.

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

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

Since installing a more modern deck, my factory speakers have been lacking in the bass department. this was a perfect, easy addition to slip under the seat!

Duncan, Salem, OR


Infinity BassLink SM Reviews

Average Customer Review(s):

(31 Reviews)
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Hands-on research

Features and 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 under 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; Infinity 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

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Larry told me to [ Keith  Feb 01, 2018 ]
Satisfied with Infinity product in a previous vehicle. [ Albert  Dec 11, 2017 ]
Recommended by a friend. Great advice! I love it! [ omar  Jan 23, 2017 ]
needed more boom in porsche [ Franklin  Dec 02, 2016 ]
I chose the Infinity Basslink to add a SubWoofer to my car. The item did not meet my expectations and was subsequently returned to Crutchfield for a refund. [ David  Oct 16, 2016 ]
brand reputation [ peter  Aug 29, 2016 ]
I needed a powered sub that would fit into the tiny backseat area of my car. I have always liked the Infinity brand and this sub had very good reviews. As always the case with Crutchfield, the price was right! [ Kirk  Aug 19, 2016 ]
This unit will fit under the driver seat on my escape [ Carlos  May 22, 2016 ]
l need more space in my vehicle. It also has a little class about it. [ James  May 04, 2016 ]
It is a high quality, slim, and efficient subwoofer. [ JACOB  Apr 11, 2016 ]
Reputation of the brand. Have other infinity speakers and they sound great. [ Francisco  Mar 16, 2016 ]
I had an infinity bass link in a previous vehicle, I have a new truck with a small space so I went with the infinity basslink sm, I chose this product because the quality and performance of the infinity line has blown me away, so I stick with what works. [ Corey  Dec 26, 2015 ]

12 questions already asked

Sure. It features the speaker level inputs (included harness) and signal sensing turn-on specifically for use with factory stereos. You'll simply tap the factory speaker wires (ones that contain the bass frequencies) and provide the newly tapped leads to the speaker level input harness provided with the Basslink SM: The rest of the install is pretty standard; power from the battery and ground to the chassis. For additional assistance and personalized recommendations, feel free to contact us directly by phone or through our online chat service: [ Ryan  Oct 04, 2018 ]  Staff
I'm not positive but you might be able to get a splinter for both amps in out to one control knob out there are a sort of old school phone line connectors but they do have independent bass control on each what I did was turn it up 3/4 and I can adjust the level through my head unit that would be the best way to control both at the same time use your bass output control on the head unit [ Paxton  Jan 05, 2018 ]
I can not answer that without seeing a schematic. [ WADE  Jan 05, 2018 ]
I put 1 in my small truck and I'm not impressed at all. It isn't loud and has very little bass. I would recommend getting a kicker or a Rockford Fosgate. [ C  Dec 06, 2016 ]
I have mine wired directly into the power supplies from the factory and have no issues at all [ Brooks  Oct 01, 2016 ]
I bought 2 basslink SM .I installed one in the trunk of my Lexus LS460,I ran power from the battery to it and tap into the rear speaker wires for audio signal. It works perfect. I installed one in my 2013 Prius 2, I am connected straight to battery also and tapping into rear speaker wires for audio signal. it works perfect also. [ stanley  Sep 30, 2016 ]
No I haven't had any problems with headlights dimming. [ TIM V  Sep 30, 2016 ]
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
I install mine in a 2009 Lexus LS 460 without a capacitor and it is working perfect [ stanley  May 18, 2016 ]
Dont need to [ anthony  May 17, 2016 ]
Yes you can that is how mine is hooked up on a classic looking radio. [ DERRICK J  Apr 26, 2016 ]
Yes. It works well splicing it into the high level inputs. There may be alternator interference if you run the power wires more than 12" in length with the speaker wires. Make sure you splice the positive and negative from both right and left to get the best base response. Have fun! [ ELLIOT L  Apr 26, 2016 ]
No. You need to use pre amp rca jacks from your deck straight to the bass link. [ JEREMY  Apr 25, 2016 ]
Yes. [ Anthony  Apr 25, 2016 ]
Yes, that's how I hooked mine up. I drive a 2016 Mazda Miata MX-5 Sport base and it's pretty much impossible to remove the head unit, but I was able to easily remove the door and wire the sub directly to the speaker wires. [ Marcus  Apr 25, 2016 ]
Yes, It has line level wire connections. [ Doug  Apr 25, 2016 ]
There are 4 screws that come in the box that fit into the small triangular openings located near the 4 corners on the front of the unit. [ Bryan  Dec 01, 2015 ]
4- 2.5 " long allen head screws that take a 3mm drive which is included. They are threaded like a lag screw, so you drill the right size hole and screw them in. [ TIM V  Dec 01, 2015 ]
Manual calls for #12AWG for power and ground and #18AWG for remote turn-on. [ TIM V  Dec 01, 2015 ]
We recommend a minimum of a 10 gauge power/ground kit for use with this model: I hope that helps! [ Ryan  Nov 27, 2015 ]  Staff
It does not. The manual does state that it is compatible with "RBC Remote Bass Controller" so you can get one for it. [ Paul  Nov 26, 2015 ]  Staff
If you are asking if it would fit under one of the front seats, I'm sure it would as it fit under the drivers seat of my WRX. I can't be sure If it would provide sufficient bass for that vehicle. It does an outstanding job in my little car. [ Christian  Nov 17, 2015 ]