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Sound Ordnance B-8PTD

125-watt compact powered subwoofer

Item #: 777B8PTD

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417 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:

417 reviews
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Great subwoofer

Written By Dick, Tennessee on Monday, July 27, 2015

Crutchfield Customer Review (What's this?)

First, let me say that I have a profound hearing loss in the mid to high pitch range. Therefore I cannot really appreciate the subtle sounds of music. However I do have very good hearing aids and do appreciate good music. This subwoofer greatly enhanced my enjoyment of my stereo system in my Ramcharger, plus my friends who have excellent hearing tell me that it sounds GREAT!

Pros: Easy to install, really nice subwoofer in a small package.

Cons: None

Sound Ordnance B-8PTD

Written By HarryB, New York on Tuesday, July 21, 2015

Crutchfield Customer Review (What's this?)

Added some nice clean bass to what was a decent (but underwhelming) factory speaker system. Don't be misled by its compact size and weight, this thing produces very nice low end and does it without taking up any space.

Pros: Fit easily under front passenger seat, excellent for the DIY types. Excellent value for the money.

Cons: None so far

feel the music

Written By jonathan s, New York on Saturday, July 18, 2015

Crutchfield Customer Review (What's this?)

completes the stereo .all I want to do is crank it up for the concert experience

Pros: low profile, easy install

Cons: none

Excellent Addition to Factory System

Written By Kyle, Pennsylvania on Wednesday, July 15, 2015

Crutchfield Customer Review (What's this?)

Can't beat it for the money. I have a Pioneer AVIC 5000NEX head unit playing through factory speakers and this subwoofer. Rounds out the bottom end nicely, and can hit decently well for its size when cranked up. Obviously no replacement for one or more 12" subwoofers, but for adding musical (not obnoxious) bass to a factory or mostly-factory audio system, this product is a win.

Pros: Price Size Decent sound for its size

Cons: Frequency response could go lower.


Written By mark, juneau AK on Monday, July 13, 2015

Crutchfield Customer Review (What's this?)

It fits where I want it and hits hard

Pros: It fits under my passenger seat with no problems.

Cons: None!

Nice punch for a tight package!

Written By Tam, Houston, TX on Sunday, July 12, 2015

Crutchfield Customer Review (What's this?)

I got a new '15 Jeep Wrangler a few months ago and felt like it was lacking quite a bit in the bass department. I had an Infinity Basslink that I pulled from my previous vehicle - and even though it is a powered sub, it was still a bit bulky for my 2dr JK.

I decided to try this B-8PTD since it was popular amongst the Jeepers, and installed it last night. It really does fill the Jeep nicely with lows. I have the stock headunit too, running off of a line out converter. Eventually I'll upgrade my head unit and it'll sound even better. I'm still trying to figure out the adjustments on the sub but it may take a little while to fine tune, just like any amp.

Very satisfied!

Pros: Tight package, nice sound, cost effective, good construction

all i can say is wow!

Written By art, California on Sunday, July 12, 2015

Crutchfield Customer Review (What's this?)

cant believe the sound from such a compact unit. absolutely love it

Pros: compact unit with big sound that doesn't take up a lot of room

Cons: 1 and only con...running battery wire for a F-150 was a pain

Wonderful little sub, fits where I need it!

Written By bimmerd00d, Austin, TX on Thursday, July 09, 2015

Crutchfield Customer Review (What's this?)

I initially purchased one of these to replace another cheapo powered sub/box combo I bought online. After speaking with Crutchfield sales chat, I was reluctant to try another one, but gave it a shot anyway. This one fit perfect in the back corner of my 1994 BMW 540iT wagon behind the access panel. I wanted something hidden from view, but added some fill to my Infinity Kappas running off a JVC receiver. I have had this one for almost 3 years now with zero issues. I bought my wife a 2005 BMW X5 recently and it came with the stock lower end system without a factory sub. It sounded fine but was lacking bass. I went right back to Crutchfield and bought another one, mounted it in the exact same spot as my old 540iT and she is happy again. Happy wife, happy life. Just last week I purchased yet, another one of these and put it behind the rear seat of my 2005 Dodge Ram 2500. Again, I like bass, but I hate advertising that I have subs in there. My truck previously had a box in there when I bought it which was removed by the previous owner. Another happy purchase! I would buy this assuming you aren't looking to rattle everything around you, but just to add nice fill without taking up any space. I would highly recommend this to anyone who wants a bit more out of their system.

Pros: Size! It packs a punch for how small its packaging is. It's been dead reliable going on 3 years now.

Cons: Isn't going to shake your organs loose by any means, it can't defy physics.

Exactly what I needed

Written By James, Florida on Sunday, July 05, 2015

Crutchfield Customer Review (What's this?)

This sub sounds very good for its size and eliminates the need for a large enclosure and separate amp. It adds a good musical sounding low end to my system without taking up a lot of space. I installed it in my 2001 Dodge Dakota Club Cab and the sub fit perfectly in the space on the transmission tunnel between the back side of my center console and the front side of the tool tray under the back seat. The sub does not obstruct the movement of the front seats and does not interfere with the tool bag and socket set in a plastic case I carry in the rear floorboards behind my front seats. I used the supplied Velcro to keep the sub from sliding around but the fit is just snug enough to hold it in place. The sound quality really is very good; the sub added back the low end that has been missing from my system for a long time. It won't shake my mirrors or wake the neighbors but it does produce very musical and accurate sub bass. I have a Pioneer MVH-X370BT deck and used the sub RCA outputs to the amp which gives a lot better control over the sound of the sub than the supplied volume knob. This sub is an excellent value and will add some good low end without taking up a lot of space, just don't expect it to rattle your windows. I listen to mostly classic rock and the B-8PTD really does add some good punch to my sound quality. I wired it with 8 gauge power and ground wire and it runs very cool, the heat sink was just barely warm even after 45 minutes of testing. It's a very good sub!

Pros: Small size should fit most anywhere. Runs cool and has excellent low end for an 8" sub. No need for a giant enclosure or large amp taking up valuable space in a smaller interior. It restores a necessary element of excitement to the music. The sub is fairly heavy for its size and appears to be very well made.

Cons: The included volume knob did not really do much for my system. I tried it with and without the volume knob and got a lot better sound control and bass output by using the sub out RCA's on my deck.