RetroSound SUB-8100

Compact powered subwoofer: 100 watts and an 8" sub

Item #: 068SUB8100

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6 Reviews

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A tough sub for tight spaces

RetroSound designed their low-profile SUB-8100 powered sub to give you rock-solid bass in regular cab trucks, classic cars, and other vehicles that don't have room for an ordinary subwoofer. The enclosure comes in at just 3" thick, so it'll fit behind or under a seat with room to spare. A 100-watt RMS amplifier powers the 8" sub, and they're perfectly matched to give your ride the bass it's been missing. Use the variable low-pass crossover and phase switch to get the sound you want, then use the compact wired remote to adjust your bass levels on the go.

Cast aluminum enclosure

Like your vehicle, the SUB-8100 is built to last. A rugged aluminum enclosure protects the sub and amp while dissipating heat generated by heavy, extended listening. Retrosound includes mounting hardware for the sub and the remote, so all you'll need is an amp wiring kit to get great bass in your vehicle.

Product Highlights:

  • compact powered subwoofer
  • 8" woofer
  • built-in 100 watts RMS amplifier
  • frequency response: 35-100 Hz
  • wired remote level control
  • variable low-pass crossover (50-100 Hz)
  • adjustable phase control (0 or 180 degrees)
  • preamp- and speaker-level inputs
  • dimensions: 10"W x 3"H x 13-7/8"D
  • warranty: 1 year
  • Our 60-day money-back guarantee

Who needs a powered subwoofer?

To produce bass, you need a sub, an enclosure, and an amplifier, and it can be little tricky to match them all up. A powered sub eliminates all the hassle, as the manufacturer designs the enclosure to house the sub and amp together. This all-in-one solution is especially useful in smaller vehicles, where there's no room to mount a separate amp, or in any vehicle where you need every bit of cargo space. Powered subs range from small, flat boxes that fit under your seat to larger boxes that go in your trunk.

Hands-on research

What's in the box?

Download owner's manual

  • Amplified subwoofer
  • Wired remote level control with attached cable (terminated with an RJ-14 plug)
  • Wiring harness (with in-line fuse holder on power wire)
  • One 10 amp glass fuse (installed)
  • 4 Metal mounting brackets
  • Four M5x12mm Machine screws
  • Four 5/8" Sheet metal screws
  • 4 Small screws (to mount remote)
  • 4 Flat washers
  • 4 Split lock washers
  • Owner's manual

Features and Specs

Enclosure Type Sealed
Finish Material Aluminum
Grille Metal
Connector Type RCA/Molex
Bi-amp Inputs No
Woofer Size (inches) 8
Woofer Material Not given
Passive Radiator ---
Width 10"
Height 3"
Depth 13-7/8"
Second Depth N/A
Parts Warranty 1 Year
Labor Warranty 1 Year
Frequency Response 50-160
Amplifier Power (RMS) 100 watts
Maximum Wattage 200 watts
Sensitivity N/A
Impedance N/A
Second Voice Coil Impedance N/A
Crossover Point 50-160

Product Research


Overview: The SUB-8100 amplified subwoofer features a 100-watt RMS (200-watts max) amp and an 8" sub housed in a rugged, compact enclosure designed to fit in tight spaces.

Wired Remote: A wired remote level control is included. The remote has integrated flanges and screws are included to mount the unit under the dash.

Mounting: The subwoofer, with its 3" height, can be mounted under a seat in the passenger compartment of many vehicles.


  • Gain: rotary dial to set the amplifier gain control; 100mV-6V
  • Phase: two position switch to set the subwoofer phase; 0° or 180°
  • Frequency: rotary dial to control the low pass crossover frequency; 50 to 160 Hz, 12 dB/octave


  • Harness: the included harness has wires for power, ground, remote turn-on, and speaker level input
  • Line Input: stereo RCA jacks
  • Remote: the included wired remote plugs into the RJ-14 jack


  • Power: 100 watts RMS/200 watts max (@14.4 volts)
  • Signal to Noise Ratio: 100 dB
  • Input Sensitivity: 100mV-6V
  • Frequency Response: 50-100 Hz
  • THD: 0.08%

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.

RetroSound SUB-8100 Reviews

Average Customer Review:

6 reviews
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perfect for small cabins

Written By ken w, buckley il on Tuesday, September 10, 2013

Crutchfield Customer Review (What's this?)

perfect addition to the system i put in my bros 1991 standard cab c1500. before the install of the sub the sound out of the 4x6 kenwood dash and the 4x6 Polk rear just was not doing the job. IE no bass and the volume just wasn't there. The difference after adding this compact unit was astounding. I would recommend this sub to anyone with space constraints.

Pros: Great in tight places. better sound than expected. has wiring harness instead of screw terminals a real plus

Cons: have not found any yet

Better Sound For a Superduty

Written By WillG, Darien, WI on Thursday, January 10, 2013

Crutchfield Customer Review (What's this?)

I just installed this in my 2002 F-350 regular cab truck. It fits great behind the seat with some modification to the plastic storage tray back there. Tim is right, it is built very solid and the adjustment knobs are high quality the wire harness is nice too, but the fuse holder is a cheap piece of crap, better to cut it out and install you own fuse. I put an in line blade style fuse right at the battery which worked great and will be easier to change if I ever have to. The sound quality is great, I have an Eclipse stereo with stock speakers so I'm not exactly going all out here, but this little sub added a fullness to my music that was missing before plus now I can turn the bass setting on the stereo down to get more volume before it starts distorting my factory speakers. I don't want to put a complete system in this truck because it is completely unmolested and there is no room, so this was a good way to get better sound. If you are looking for a license plate rattling thump thump, this is obviously not the answer.

Pros: Heavy duty, compact, easy installation, reasonable price, great sound.

Cons: Made in China

Very Pleaseed

Written By Tim, Virginia Beach, VA on Monday, August 27, 2012

Crutchfield Customer Review (What's this?)

Very pleased with the RetroSound powered sub. The unit is solid metal, built like a rock. Very easy to install under my front passenger seat.

Pros: Sounds great. Compact. Easy to install

Cons: None


Written By Digger, Phoenix AZ on Thursday, July 26, 2012

Crutchfield Customer Review (What's this?)

This is a Skipper, buy the sound ordinance this will not hold up against the smallest of amps, My Miata headrest speakers would over power two of these subs.

Pros: Thin, Stong well built case

Cons: No Power

Big sound in a little package.

Written By Jojo, Oscoda,MI on Sunday, July 08, 2012

Crutchfield Customer Review (What's this?)

All I can say is wow,what a nice sub for small car or truck.I just put it in a 1997 Nissan std cab pickup never would have thought I could fit a sub behinde the seat(most people would have put a box behide the seat and moved the seat up to make room for the sub,not me Im 6'1" and the seat in any position but all the way back is not a option)installation was simple and fast,and they matched up well with the polk 651 6.5" I installed the day before(no amp on the polk's)I was happy with just the polks but I bought the sub the same time but wanted to hear it with and without the sub. I figured if the sub gave me even a little bass I would be vary happy,well it gave me a lot of bass,couldn't be happier.

Pros: vary small with big bass

Cons: none

RetroSound SUB-8100

Written By KeithK, Tampa, FL on Thursday, May 17, 2012

Crutchfield Customer Review (What's this?)

This is a nifty little sub and easy to install, but it just didn't move enough air for me. I'm not even really a huge bass advocate, but I needed more than what this was able to provide.

Get everything you’ll need to enjoy your new RetroSound SUB-8100

Wiring not included with the sub. Kits make it easier and less expensive to install your new powered subwoofer.
Dynamat helps reduce ambient road noise and your vehicle's "rattles," making it easier for you to hear your music better. Easy to install.
It's critical to have good wire, and none is included with the sub.
If you are using the pre amp inputs on this powered sub, better quality cables will improve the sound.
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