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Sound Ordnance B-8PTD

125-watt compact powered subwoofer

Item #: 777B8PTD

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432 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:

432 reviews
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Great Sound! Great Size!

Written By Mike, New Jersey on Wednesday, September 02, 2015

Great Sound and a Great Size. Fit right under the rear seat of my Jeep Wrangler and sounds much larger than it is!

Pros: Size & Sound

Sound is great, input is finicky

Written By DJN, Illinois on Tuesday, September 01, 2015

Crutchfield Customer Review (What's this?)

An Amazing little sub for the price (and the Size!). I was happy to spend so little cash to put a sub in my boyfriend's Prius-C hatchback. This little guy fits charmingly under the front seat and produces considerable bass for such an adorable little fellow.

However the inputs are a bit twitchy...the volume has to be nearly maxed out to kick the sub on, and at a reasonable volume with two people in the car, it will randomly drop in and out. Some songs/volumes will not activate the sub at all, even though the door speakers are vibrating in their enclosures. Overall I'm satisfied with it, but if you're not able to replace a modern car's overly-fancy head-unit to a unit with direct sub input, this sub's decision for when is a good time to be switched on leaves a lot to be desired.

Also our first unit was defective. :( Crutchfield customer service was amazing (had a new one out that afternoon) but I don't think anything will make up for spending 4 hours face-down under the rear seat of a hatchback only to find you've installed a defective subwoofer.

Pros: Great sound, tiny adorable size, solid construction

Cons: "auto on" feature is twitchy at best


Written By Ron H, Colorado on Tuesday, September 01, 2015

Crutchfield Customer Review (What's this?)

Easy to install and sounds great in the back of my jeep.

Pros: Good sound from a compact size.

Cons: Directions could be a little more specific.

Sound Ordnance B-8PTD

Written By I, New York on Sunday, August 30, 2015

Crutchfield Customer Review (What's this?)

Was Looking for a Sub-woofer that would fill out the lows,in my sound system and would sound Great. Also needed something compacted, this totally fit,what I need.Sound Great.

Pros: Compacted, anb sounds Great

Cons: None

Cool Bass Sound Ordnance B-8PTD

Written By Marshall B, Jonesboro Arkansas on Saturday, August 29, 2015

Crutchfield Customer Review (What's this?)

Installed the unit on this Saturday 8/29/15 , took me four hours I'm guessing by the time I rounded up all the tools and finished ! I'm very impressed with Powered Subwoffer in my Regular Cab 2013 Chevy Siliverado . I thought it would make a difference , just not as much as it has ( Awesome Big Bass ) . Just hope it gives me many a years of service.

Pros: Fits perfect and out of the way , great little Bass setup ! It really enhances my Pioneer receiver and kicker speakers in the door and overhead that I purchased from Crutchfield .

Cons: None yet , but then I just installed it ! Maybe another review later down the road !

Not much boom

Written By Craig T, Texas on Saturday, August 29, 2015

Crutchfield Customer Review (What's this?)

I installed this in the spare tire hatch in the back of my SUV. It's very compact, but really lacks the range, and oomph I wanted. A separate amp/sub combo is what I need and ended going with. the JL Audio 8" 3wV3 ported enclosure fit in the same area, and provided the musical, and fun factor I desired.

Pros: Compact size

Cons: Musical range, power