Sound Ordnance B-8PTD

125-watt compact powered subwoofer

Item #: 777B8PTD

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360 Reviews



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Fill your vehicle with bass, not equipment

Want to put some bass to your vehicle without a lot of fuss? Sound Ordnance's B-8PTD powered subwoofer is the latest version of the B-8PT, one of our all-time best-selling compact powered subwoofers. Sound Ordnance built this new version to perform even better than its predecessor, putting a cool-running 125-watt amp and a rugged aluminum 8" sub in an extremely compact, solid ABS plastic enclosure,so you get years of bass satisfaction. This all-in-one unit frees you from having to deal with a separate sub, amp, and enclosure, saves you cargo space, and simplifies your wiring requirements. Whether it's mounted under your car seat or in an out-of-the-way location in the cab of your truck, this little workhorse will surprise you with its impressive bass and its ability to mesh perfectly with the rest of your system.

Sound Ordnance B-8PTD powered sub

This compact sub delivers strong bass without taking up much space.

Big bass from this tough little sub

A 125-watt RMS Class D amplifier powers the sub and lives on a compact circuit board mounted inside the enclosure. The sub's stiff 8" aluminum cone holds its shape even when playing hard, helping to keep the lowest notes clean, and ensuring a long life for the sub. You can adjust the low-pass filter, variable phase control, and bass boost to get the B-8PTD sounding perfect in your vehicle. Preamp- and speaker-level inputs allow convenient connection to just about any system, even a factory stereo.

Sound Ordnance B-8PTD powered subwoofer

The molded ABS enclosure houses a 125-watt amp and a tough little 8" sub.

Good design helps

The B-8PTD's tough outer casing of molded ABS plastic serves as the sub's sealed enclosure and can withstand some pretty extreme internal pressure changes with no reverberating or buzzing. Sound Ordnance conveniently located the neat, clean, easy-to-understand controls on one side, opposite all the connections, so you won't get tangled in wires as you tune your bass. The control knobs and switches aren't recessed, so you can make adjustments by hand, without the need for a tiny screwdriver.

Product Highlights:

  • powered subwoofer with heavy-duty ABS plastic enclosure
  • 8" woofer with aluminum cone
  • built-in Class D amplifier (125 watts RMS/250 watts peak)
  • frequency response: 40-200 Hz
  • variable low-pass crossover (80-200 Hz)
  • variable phase control (0-180 degrees)
  • bass boost control (0dB to +10dB)
  • preamp- and speaker-level inputs
  • auto turn-on switch
  • wired remote control included
  • 8- or 10-gauge wiring (not included) recommended
  • dimensions: 9-1/8"W x 3-1/8"H x 13-5/8"D
  • warranty: 3 years
  • 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
  • Two 15A ATO fuses (1 installed)
  • Wired remote bass control
  • 14' Remote cable (RJ-14 plug on both ends)
  • 8" Speaker input harness
  • 2 Mounting clamps (4" x 1")
  • Two 6" x 3/4" Self-adhesive "Hook" strips (half of the Hook and Loop combination)
  • Seven 3/4" self-tapping screws (to secure mounting clamps and wired remote)
  • 4 Self-adhesive foam strips (two 3/16" wide and two 1/4" wide)
  • Owner's manual
  • Mounting feet instructions
  • Warranty information

Features and Specs

Enclosure Type Sealed
Finish Material Metal/plastic
Grille Metal
Connector Type RCA/Molex
Bi-amp Inputs No
Woofer Size (inches) 8
Woofer Material Aluminum
Passive Radiator ---
Width 9-1/8"
Height 3-1/8"
Depth 13-5/8"
Second Depth N/A
Parts Warranty 3 Years
Labor Warranty 3 Years
Frequency Response 40-200
Amplifier Power (RMS) 125 watts
Maximum Wattage 250 watts
Sensitivity 88 dB
Impedance N/A
Second Voice Coil Impedance N/A
Crossover Point 80-200

Product Research



Overview: The B-8PTD amplified subwoofer features a 125-watt RMS (250-watts max) amp and an 8" sub housed in a rugged, compact enclosure designed to fit in tight spaces.

Wired Remote Control: The wired remote puts control of your subwoofer output level within easy reach. The remote can be mounted using the attached double sided tape or the included self-tapping screw. The dimensions are:

  • Width: 1-3/16"
  • Height: 1-1/4"
  • Depth: 1-7/8" (2-1/2" including the knob)

Mounting: The subwoofer, with its height just over 3", can be mounted flat under a seat in the passenger compartment of many vehicles. Two mounting clamps are included to secure the subwoofer to a flat surface.


Power Mode:

  • Auto: amp turns on when a signal is present on the speaker-level input
  • Remote: amp turns on when 12 volts is applied to the remote terminal

Level: rotary dial to set the amplifier gain control

Bass EQ: bass boost; rotary knob, 0 to 10 dB

Phase: rotary dial to set the subwoofer phase; 0° to 180°

Frequency: rotary dial to control the low pass crossover frequency; 80 to 200 Hz


Power: power, ground, and remote inputs are on a screw terminal strip; each is 0.35" wide

Line Input: stereo RCA jacks

Speaker Input: Molex jack for the included harness

Remote: 4-pin RJ-14 jack for use with included remote cable

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.

Sound Ordnance B-8PTD Reviews

Average Customer Review:

360 reviews
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Added Bass

Written By BoroWillis, Shreveport, La on Thursday, March 26, 2015

Overall good performance for the Unit. Once everything is properly adjusted.

Pros: Great improvement to factory stereo. For the money this unit provides good bass. Easy to install. Proper adjustment is worth the time. The remote turn-on works very well. Used an add on fuse holder to connect remote turn on. In my 2013 F-150 I used fuse location 41 in the passenger side kick plate.

Cons: The auto turn on does not work well with my factory stereo. Use the remote turn on!

Great boom for the buck

Written By Jay, Md on Friday, March 20, 2015

Crutchfield Customer Review (What's this?)

Second one I have owned. Sold the first one with my last TJ jeep. Had to have another one with my JK. Fits nice under passenger seat.

Pros: Compact .Great sound great price.

Cons: None

Small, but powerful

Written By gbeau, North Carolina on Wednesday, March 18, 2015

Crutchfield Customer Review (What's this?)

This product is amazing! I was going to purchase two for my Jeep Wrangler, but I would have ended up sending one back if I had done so. This product packs a powerful punch; if I'm sitting at a red light, I tend to turn it down to below 10, just so I don't upset the cars next to me. If you do purchase this product, make sure you purchase an amp kit along with it. Otherwise, I have absolutely no complaints.

Awesome little guy!

Written By Drummerstubbs, Logan Utah on Monday, March 16, 2015

Crutchfield Customer Review (What's this?)

Exactly what I needed! I had mixed emotions ordering this sub but once I hooked it up and got it going I was full of smiles. And it fit perfectly behind the seat in my truck. It rattles my rear view mirror which is pretty exciting. It's only limited on the really low frequencies. But I mean really really low frequencies. Which accounted for maybe two songs in my collection.

Pros: Price!! Size! Ease of use!

Cons: Real low frequencies. But it's only an 8" sub so expecting more would be unrealistic so this doesn't count as a con.

Got some boom now

Written By Wesley J., wichita is on Friday, March 13, 2015

Crutchfield Customer Review (What's this?)

I bought this subwoofer for my single cab Chevy. I read quite a few reviews before I made my purchase and I couldn't be happier. The sub does shake my rear view mirror on some songs but for the most part it provides just the right amount of bass.

Pros: Great size fit behind my seat. Easy to wire up. The remote is awesome.

Cons: The self adhesive on the gain knob didn't work very long.

Great quality, great sound, not for me

Written By Cwood, raleigh, nc on Saturday, March 07, 2015

Crutchfield Customer Review (What's this?)

After a week of adjusting to it, it sounded better than originally did at first installation. I was looking for more of a thump, deeper bass so unfortunately I had to replace it with a different sub. I listen to more electronic, rap, hip-hop so it wasn't for me. Though it did well for rock, country and less bass filled genres.

Pros: Fills the mid-low bass really well

Cons: Doesn't satisfy deep bass

Perfect Fit

Written By John, Virginia on Friday, March 06, 2015

The perfect size and sound for my 69 corvette.

Pros: Size, sound and price

Cons: None

Perfect for Jeep Wrangler

Written By Moosehead, Spokane Valley, Washington on Thursday, March 05, 2015

Crutchfield Customer Review (What's this?)

Installed a new receiver and speakers in '04 Jeep Wrangler 6 months ago. Had trouble getting decent sound UNTIL I installed this powered mini-sub. Now the whole system sounds amazing. Full, rich, loud and undistorted. Was originally planning on mounting the sub under the driver's seat or inside the center consul, but it was just slightly too big for either location. Ended up installing it in the rear cargo area. For such a compact unit, it's sound is huge and frees up the other speakers to do what they were designed to do in the mid and higher frequencies.

Pros: Great value, ease of installation, compact with BIG clear bass.

Xterra Install

Written By Craig S, Erie, PA on Saturday, February 28, 2015

Crutchfield Customer Review (What's this?)

Small and perfect for underseat install.

Great addition to my factory system

Written By PCW127, Austin TX on Wednesday, February 25, 2015

Crutchfield Customer Review (What's this?)

After upgrading my 2014 Mazda3 factory speakers to Polk DB651S I needed a small subwoofer that will round out my system. I chose this subwoofer because of its small footprint and ample power. The subwoofer fits under the front seats; however I did not want to loose any foot room for the backseat passengers so I installed it behind the 2nd row seat. The subwoofer fits perfectly and takes up very little room. After tinkering with the settings I was able to obtain good bass response for variety of music. The most impressive part is the amount of bass this subwoofer is capable of handling. This is an excellent subwoofer for rock, pop, jazz, classical and even trance/ techno but not so much for hip pop. If you need a small subwoofer that rounds out your factory system then this is the one to get.

Pros: Small footprint Powerful bass Easy to install Easy to calibrate

Cons: The bass notes can be tighter


Written By B. Rossman, MA on Sunday, February 22, 2015

Crutchfield Customer Review (What's this?)

I Bought 2 of these for under my rear seat and installed 1 temporarily till I could get to installing the other.. All I got to say is WOW.. What a difference it made.. If your looking to Blow your windows or you want people to hear your Bass a Block away than this sub isn't for you.. If you want to get some clean clear bass and keep your space, than I recomend this powered subb.. I debating on even installing other one..

Pros: Price, quality, and space saving..

Cons: Can't think of any cons.... Hmmm if I come across any I'll be sure to update.


Written By VixA, Illinois on Sunday, February 15, 2015

Crutchfield Customer Review (What's this?)

I like this product so much that I bought another one, thank you Crutchfield you have a great team of people working for you that helped me pick this item and the assistance I got too hook up my system for the sound that you get out of this product it is well worth your investment again thank you.

Pros: very easy to installed.

Cons: none to be found.

Great product

Written By Anonymous, Tucson, AZ on Sunday, February 08, 2015

Crutchfield Customer Review (What's this?)

Great little bass!!! Easy hook up sounds awesome.

Pros: Great for small space!!!

Cons: None so far


Written By Jared, Moyock, NC on Monday, February 02, 2015

Crutchfield Customer Review (What's this?)

Excellent bass to match factory system.

Pros: Not over bearing

Cons: None


Written By DAN, New York on Monday, January 19, 2015

Crutchfield Customer Review (What's this?)

Great sound from a small package..Installed this in my 04 Wrangler . Fit perfectly under the seat. Not earth shattering bass but more than fills in the bottom end. For my application I don't think you could find anything better.

Pros: small enough to be hidden under the seat. great price

Cons: none for me