Sound Ordnance B-8PTD

125-watt compact powered subwoofer

Item #: 777B8PTD

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375 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:

375 reviews
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Woke Up My 98 Jeep Wrangler

Written By AKTJ, Alaska on Thursday, April 16, 2015

Jeeps are notoriously for being a brick on wheels with minimal space. This makes for some bad acoustics. I upgraded to 5.25" speakers in the front and 6.5" in the sound bar, but it still sounded hollow like a tin can. After reading various reviews on jeep forums, I went with this powered subwoofer. I picked it up on a scratch & dent sale. I also picked up a Rockford Fosgate 10ga wiring kit. The install took about 3 hours with wiring the amp to the battery and the amp to the head unit. I was going to mount it in the center console, but space wouldn't allow it. I mounted it dead center under the back seat, which makes for easy adjustment. The fine tuning bass controller was run to the center console to allow for changes depending on the song. I am very pleased with the sound this little package provides and how easy it was to do a professional install in my garage. If you're tired of the stock system in your jeep and don't want to give up the limited space available, this unit won't disappoint.

Pros: Good bass fill for poor acoustic vehicles Ease of install Technical support

Cons: None so far


Written By Anonymous, Puerto Rico on Tuesday, April 14, 2015

Crutchfield Customer Review (What's this?)

Easy to instal and has greate sound.

Sound Ordnance B-8PTD

Written By Anonymous, Tacoma wa on Tuesday, April 14, 2015

Crutchfield Customer Review (What's this?)

Decent bass when adjusted correctly. However, the connection points are garbage. Best advice, buy the 8 gauge plugs, solder the ground, power and remote. This will create the best contact for the unit. Too bad they don't provide them. Had to purchase them locally.

Pros: Decent bass when placed in right spot.

Cons: Connection point sucks.

Better Than I had hoped

Written By AbeC, California on Monday, April 13, 2015

Crutchfield Customer Review (What's this?)

I got this for my 2006 Silverado CC HD. I put it under the rear seat and had plenty of room. I read the reviews and decided to take a chance. I am glad I did! It fills in the lows really nice. I was skeptical when I opened the box, it is very small. But, when I cranked it up, it sounded great. 30yrs ago I used to have a thumping system with 4 tens. I was not looking to reproduce that but my standards are pretty high for sound quality. The good news is that it doesn't sound boomy at all. I can have it cranked and outside my truck it sounds normal, not like some teenager mobile. The bass control knob is a nice touch- I use it to fine tune the bass. Overall, I am really happy that it sounds great and doesn't rumble the neighbors.

Pros: compact Easy to install

Cons: None so far.

Sound ordinance B-8PTD

Written By Dale, Sardinia,OH on Sunday, April 12, 2015

Crutchfield Customer Review (What's this?)

Installed this in my 1991 Mazda Miata. Installed in trunk, installation was easy. Helped filling the sound out in the convertible. Was a very good addition to the sound system.

Pros: Small and easy to install.

Cons: Would not advise to use for deep hip-hop music.

Great Powered Sub!

Written By David, Minnesota on Sunday, April 12, 2015

Crutchfield Customer Review (What's this?)

I wanted to add some definition to my 02 Jeep Grand Cherokee which I already have a Pioneer DEH-X8500BH Receiver. The factory speakers sound okay but the Sound Ordnance B-8PTD makes a some serious punch! Thanks Crutchfield for a great deal on a great powered sub!

Pros: Easy installation, takes up very little room.

Cons: none

Awesome Compact Sub

Written By SJM, Tucson, Arizona on Saturday, April 11, 2015

Crutchfield Customer Review (What's this?)

I added this subwoofer to my 2000 Corvette and it has exceeded my expectations! This compact unit did not compromise the limited cargo space of the car; it delivers clear and deep bass and it is a great addition to the stock Bose speaker system. Also the remote volume control is a great option to have, you have a quick and easy ability to adjust you sub's volume without having to fumble through your head unit's menus.

Pros: Compact and great sounding design, plus a remote volume controler

Cons: None noted.

Sub addition equals great sound!

Written By Francis, Oakland, CA on Thursday, April 09, 2015

Crutchfield Customer Review (What's this?)

I need a compact sub to fit my little C230 hatchback. This tucks in without hogging up all the trunk space. It took all the burden off the stock speakers in carry the lows, making them sound great. Adjustable nob to customize the bass level to listeners needs. Powerful and pleasant.

Pros: Compact, adjustable, powerful

Puts out lots of sound

Written By Jp, Lafayette, IN on Monday, April 06, 2015

Crutchfield Customer Review (What's this?)

Has zero low end bass. It's all upper like 80hz up. It is loud however. I have years of experience with mobile audio and this sub isn't as good as any factory sub I've ever heard, which is all I was going for. Better off with a real sub/amp combo

Pros: Small

Cons: Sound

Sound Ordnance B-8PTD

Written By B2, Lansing, MI on Sunday, April 05, 2015

Crutchfield Customer Review (What's this?)

Very nice package, works great in Jeep wrangler.

Great little sub!

Written By Erik, Boston, MA on Wednesday, April 01, 2015

Crutchfield Customer Review (What's this?)

Giving this 5 stars based on what it is. It's a very small and compact sub that fits under the rear seat of my crew cab truck. I hooked it to the factory Bose system with a line output converter and an amp kit. The positive reviews online really convinced me to try it. And I am not disappointed. This thing puts out a lot of sound for such a small package. Makes listening to music more enjoyable and the bass remote knob is also a nice touch.

Awesome, much better than I need.

Written By Accident Prone, Moscow, ID on Monday, March 30, 2015

Crutchfield Customer Review (What's this?)

Incredibly clear and strong sub. Installed under my driver seat and it will shake my car. Not like duel 12's with a huge amp. This is perfect for rounding out a nice system for those not attempting to compensate for anything.

Pros: Clarity, ease of install, strength for size, compact.

Cons: None.

Sound Ordnance B-8PTD

Written By Anonymous, Minnesota on Sunday, March 29, 2015

Crutchfield Customer Review (What's this?)


Pros: Great product!

Cons: None

Absolutely Love it! 2013 GMC Sierra Extended Cab

Written By Justin M., Massachusetts on Friday, March 27, 2015

Crutchfield Customer Review (What's this?)

Ive had several powered subs, in various vehicles over the years. All of them did pretty much the same job, filling out the missing bass from deck/speaker replacements. This one actually blew me away. I mounted it under the middle of the back seat. It's hidden enough and won't get in the way of anything. It can either fill in the missing voids or turn up the dial and this sub actually hits pretty hard! I was shocked! It's only been a week but so far, I'm very impressed. Definitely recommend it to anyone looking to add substance to their vehicle.

Pros: Unbelievable sound, remote knob, easy to install

Cons: none

Added Bass

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

Crutchfield Customer Review (What's this?)

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!

Not a Fan

Written By Todd B, Kentucky on Thursday, March 26, 2015

Crutchfield Customer Review (What's this?)

Not what it's cracked up to be. Looks cool, seems like a good value, but sound quality just isn't there. Spend a little extra money and buy a good c