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Sound Ordnance B-8PTD

125-watt compact powered subwoofer

Item #: 777B8PTD

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426 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.

Sound Ordnance B-8PTD Reviews

Average Customer Review:

426 reviews
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Great Amp/Sub Combo

Written By Steve, Georgia on Thursday, August 27, 2015

I have been looking at an Amp/Sub combo for a long time for my 2013 Ford Escape because I wanted some base added to the factory radio. It took me a while because I was skeptical that they would really give me any good base sound. I chose the Sound Ordnance B-8PTD to fit under one of my seats. Well... it did not fit under either seat... so I started looking elsewhere. I found a perfect spot in the spare tire compartment that had an indentation that seemed to be made for it. I hooked it up per the instructions using the high-level input (from the rear speakers) and the auto-on feature. When I tried it.. it seemed to work sometimes and sometimes not. After a couple calls to Tech Support (those guys know their stuff) I had to connect the "Remote On" terminal to the ignition. It works great now. Not a thumping base but a good addition to the factory radio.

Pros: Great addition to factory radio.

Cons: None

Great performance and compact.

Written By Dan, Union Mills, IN on Sunday, August 23, 2015

Crutchfield Customer Review (What's this?)

Definetly recommend

Does wonders for my VW Vanagon

Written By Payton S, California on Sunday, August 16, 2015

Crutchfield Customer Review (What's this?)

The factory speaker size on a Vanagon is 4 inches and the bass and midrange on those small speakers are weak. This subwoofer has improved the sound 10 fold. We are loving it. I placed it behind the drivers seat. This is VW Vanagon Carat 7 seater.

Pros: Sound, ease of installation, price

Cons: None so far


Written By Brandon, Texas on Wednesday, August 12, 2015

Crutchfield Customer Review (What's this?)

my recommendation is that you make sure you can fit this under your seat. i thought i would be able to but i had to install it in the trunk. for me, the bass was not nearly enough. also, this sub seems to have a little extra response somewhere around the 100-150 hertz range and the effect of that is that the bass drones a little bit when you have the volume up, which was annoying to me.

in the trunk: i'd give this 3 stars. if you can put it under your seat, it's probably more of a 4 star product.

it's not meant for crushing bass, but it will absolutely fill out the low end of your system and makes all music sound better.

Pros: very compact, easy to tune, fills out low end response for balanced sound.

Cons: Bass response was underwhelming. not loud enough from the trunk.

Take your time and dial it in!

Written By BenzVette, Bellevue, Washington on Tuesday, August 11, 2015

Crutchfield Customer Review (What's this?)

I needed to replace my Kenwood flat panel powered sub (it was a good sub, but the speaker just wore out). Wanting a slimmer profile, I googled "powered flat panel subwoofers" (8" & 10"). I read reviews. Read more reviews, checked out forums and you know what, there's something negative to say about them all. It's weeding through the thicket and understanding what I needed for my application (1978 Corvette). I picked up a 10" online (another brand), and never hooked it up (1/2-1" too tall for where I was mounting; vertically on the back cargo wall). So digging the reviews on the Sound Ordnance, I logged into my Crutchfield account and ordered the B-8PTD. It arrived quickly and was packaged to withstand any Jim Carey attempt to deliver a UPS package! I purchased a 8-gauge wiring kit (Crutchfield) and quickly went to town installing my new sub. Installed and ready to go, I pulled up AC/DC's Back in Black album for some classic rock testing. I'm going to be honest, I know better but I was expecting perfection out of the box. It sounded horrible! Just lack luster. But after hours, days and a week later I dialed that sub in for some awesome hard hitting base! (now to clarify, this is NOT a window shattering sub. If you want that, buy that type. But you will get good solid base that fills the void and if you do it right, feel it!). You need to adjust the EQ on your head unit, then the sub. Then back to the EQ, etc. Take your time and use a variety of music. You'll thank yourself!

Pros: Great Packaging. Quality build. Powerful.

Cons: More Power (just kidding). But more is always better right?

Great Value, Compact

Written By Anonymous, Pennsylvania on Tuesday, August 11, 2015

Crutchfield Customer Review (What's this?)

Very pleased with this powered sub. I used to think you needed a giant box with a sub to get the deep tones, but now that I am getting older (and wiser) I don't have the room or need for that kind of setup. I installed this unit under my passenger seat of my 2013 Jeep Wrangler Unlimited. Install was straight forward after researching where to run the wires to reach the battery. I have this sub paired with an aftermarket head unit from Pioneer and aftermarket speakers. The best feature for me is the included wired remote. This makes it easy to change the level of bass depending on your music selection. This is also very handy if I have the top off the Jeep since I can increase the level quickly if needed, whether I am on an open road or need to bring it down through a neighborhood.

At first I was hesitant if this powered sub could produce the sound I now desired, and I was pleasantly surprised. I would recommend this to anyone.

Pros: Good value, Compact, Wired Remote


Written By DerekR, Kansas on Tuesday, August 11, 2015

Crutchfield Customer Review (What's this?)

Great sound for a low price

Great product