Sound Ordnance B-8PTD

125-watt compact powered subwoofer

Item #: 777B8PTD

In Stock

333 Reviews | 25 questions - 96 answers

Your price: $199.99 Earn up to 200 Rewards points

Add to Cart Free Shipping Lifetime Tech Support

+ Add to wishlist + Email me alerts for this product

View all associated offers

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 open the box, verify contents, 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:

333 reviews
Review this product
Great Gear Giveaway

Submit a review and then enter to win a $500 rewards card


Review this product:

Thanks for taking the time to share your experiences about this product. Please be sure to focus your comments on the product itself. Read our Review Guidelines for more information.

Your email won't be visible. Please use the email address that is associated with your order.
(e.g., JohnD) Your review will be signed using the display name and location
(e.g., Charlottesville, VA)

Click on a star to rate the overall product on a scale of 1-5
1500 characters left
  Attach a YouTube Review
Crutchfield Video Review Guidelines
  • Only submit videos that you made or are authorized to use.
  • Do not submit videos that contain music, video or visuals that are copyrighted and belong to someone else.
  • Please see our Review Guidelines for more information.
500 characters left
500 characters left

Sound Ordnance B-8PTD Subwofffer

Written By Roy B, Colorado on Saturday, December 20, 2014

Installed this in a 2001 Chev. Crew Cab for my great grandson. It fit behind the rear set on the back wall of the cab. It has a great sound and all the kids think it's great.


Written By Josh, Maryland on Wednesday, December 17, 2014

Crutchfield Customer Review (What's this?)

It works perfectly for a single cab pickup. I glued in a couple 1x4s behind the carpet on the back wall of my single cab 93 s10. I mounted it on the wall and i couldnt be happier

Awesome Little Sub

Written By Bigdogself, Winter Haven Fl on Monday, December 15, 2014

Crutchfield Customer Review (What's this?)

I installed this in my 2006 Jeep Wrangler Unlimited. Since I didn't want to loose any cargo room, I installed it in the center console where the factory subwoofer would go. This turned out to work very well, and I only lost space that I would throw small items into. This really made my system come to life. I am currently running Infinity Kappa's in the dash and overhead sound pods.

Pros: Small Size, Good Value

Cons: None

Sound Ordnance B-8PTD

Written By Cliff, Arizona on Monday, December 15, 2014

Crutchfield Customer Review (What's this?)

Wow, what an improvement for the stock radio. Love the bass, not to much, but just right.

Pros: Easy to install, found the right place behind the crew cab back seat. Great instructions and tech help over the phone.

Cons: Should have purchased one long ago. If that's a con ??

Nice sound

Written By erok, mineral, va on Monday, December 15, 2014

Crutchfield Customer Review (What's this?)

Nice sound. Gave me a nice rounded sound system. Not overwhelming bass but it gave me the thump I was missing

Pros: cost and size

Cons: none

Sound Ordnance B-8PTD

Written By Shawn, Hawaii on Thursday, December 11, 2014

Crutchfield Customer Review (What's this?)

Great sound, high quality, easy to install.

Pros: Takes up little space

Cons: None

Great to fill in the low end

Written By JoeM, Chandler, AZ on Monday, December 08, 2014

Crutchfield Customer Review (What's this?)

I purchased this to fill in the low end when doing minor upgrades to the audio system of my 2015 Forester. I kept the factory head unit, installed a set of Focal Polyglass 165VRs that I already had, an Alpine KTP-445U to power the components, and this powered sub.

The sub does great and helps fill in the low end that the component speaker setup is lacking. I am especially impressed considering it's small size and low price. I installed mine using the high level input by tapping into the front speaker wires coming from the back of the head unit harness. It fit perfectly under the driver's power seat after trimming the rear seat heater vent. I find the auto turn on using the high level input to be finicky so I ran a remote turn on lead to a switched +12V output. I removed the remote level control from it's housing and just the board fit great in a factory blank in my center console.

If you keep your expectations realistic and tune the sub correctly you will probably be happy with it. It's not going to have the sound quality or loudness of a high-end component sub in a larger box being fed by a high power amp. If you are looking for the type of bass you would experience in a club, look elsewhere. What it does do is fit in places where it is practically invisible and provide the low end that is missing in most systems without a sub. Tune it correctly and go easy on the bass boost and it will provide good, clean bass at reasonable volumes.

Pros: Small size that allows it to be installed under many seats. 0-180 degree phase adjustment to fine tune it. High level and low level inputs so it can be integrated into a system without low level outputs without needing a LOC. Easily accessible controls so it can be tuned with the car put back together. Good, clean sound at reasonable volume levels.

Cons: It is only 125W so it cannot keep up with high powered components at higher volume levels (my Focals are receiving 90W each). Auto turn on when using high level inputs is finicky. The housing and knob for the remote volume control are huge (the housing can be removed but the knob size can still limit placement in a dash or center console). Can be boomy if the gains are turned up too high and the volume is set high.

Bring on the Base

Written By Runner421, Tennessee on Thursday, November 27, 2014

Crutchfield Customer Review (What's this?)

Ford F350 XLT Crew Cab. Factory stereo without sub. Ordered this little powered subwoofer to get some bass. Quite impressive! Fits behind the seat where the factory sub would have been. The truck's stereo was not equipped with a sub pre-out, so wired it by splicing in to the rear left and right speakers. Used the amp supplied volume/level control so you can control the bass level from the driver's seat. Spliced the sub's power wire to a switched line so it powers off/on based on ignition switch position. To do it right you should remove the rear seats in order to pull off the speaker/pillar panels and get to the speaker wiring.

Pros: powered clean base easy settings comes with wired volume/level controller

Cons: if vehicle's stereo not equipped with sub out, extra steps to splice in to factory speakers, use the sub volume/level controller, but not a deal breaker!

Plenty of bass

Written By Anonymous, Muse, PA on Monday, November 24, 2014

Crutchfield Customer Review (What's this?)

Sounds bigger than it looks. Really fills out the sound in my crew cab truck. Pretty easy to install. Glad Crutchfield recommended it. Only con is remote cord is too short.

Pros: Small and sounds great.

Cons: Remote cord is too short.

Crutchfield in a crunch

Written By Jerry Barrett, Coalinga, CA on Sunday, November 23, 2014

Crutchfield Customer Review (What's this?)

Read the pros and cons of my feedback entry.

Pros: Awesome addition to my personal system due to Crutchfield. Sales team knew my 01 Ranger xlt across the board. There was several complications across the board throughout my multi transaction project but thanks Crutchfield for the finished product. :-)

Cons: The cons are simple. I bought my head unit elsewhere, however Crutchfield tailored a system to make it awesome. Crutchfield tailored wireing, amps, speakers, and of course the subs. Thanks..

Sound Ordnance B-8PTD

Written By Mr Tucker, Maynard, MA on Saturday, November 22, 2014

Crutchfield Customer Review (What's this?)

Just bought and installed the S/O B-8PTD in my Wrangler J/K. I didn't know what to expect from this with a soft top, a bare metal floor and not thinking I had any room to fit any bass. This thing fit right under my seat without an issue and was good to go from there

Big sound, small footprint!

Written By Jacob, Illinois on Friday, November 21, 2014

Crutchfield Customer Review (What's this?)

This is very easy to set up! It packs a big punch with such a small footprint! Awesome!

Cons: None!


Written By Jwar, Central Florida on Sunday, November 16, 2014

Crutchfield Customer Review (What's this?)

Nicely surprised. Arrived seemingly overnight packaged for a safe ride with the "Ultimate Package Smashers". Wasn't expecting much was just hoping for relieving the mains from some of the low frequency stuff and found it to provide nice tight not muddy sound. The free install kit from Crutchfield very nice touch.

Pros: Quality, Price, Sound.

Cons: Nada.

compact sub

Written By rbparki, Harrisonburg, VA on Wednesday, November 12, 2014

Needed a sub and did not have much space. The sound ordinance 8" self contained unit worked perfectly.

Pros: Easy to install. Sounds great.

It's aight

Written By Birds nest, Maine on Monday, November 10, 2014

Crutchfield Customer Review (What's this?)

This is okay. It doesn't blow your socks off, not just in thumping bass, but in overall sound quality. It's kind of muddy ad doesn't carry a punch. It helps make the system sound better, but knowing what I know, I probably would have tried something else.

Pros: installation

Cons: It doesn't really have a nice bass sound

Good little sub

Written By Anonymous, PHX AZ on Monday, November 10, 2014

Crutchfield Customer Review (What's this?)

Good bang for the buck, I don't think it would work very good for a sedan type of car or SUV but works great for my little single cab work truck, fits behind the seat with no problem and provides good base..You aint gonna be bumpin to the point where people hear you in cars beside you..But it sounds good with anything rock,rap,country. It just makes it sound like you have good speakers with good bass.


Written By ALBERTO G., LAREDO TEXAS on Monday, October 27, 2014

Crutchfield Customer Review (What's this?)

outstanding speaker for it size

Pros: powerful sound amazing my Porsche boxster is complete

Cons: none

Perfect for limited space

Written By Charlie, Pa. on Saturday, October 25, 2014

Crutchfield Customer Review (What's this?)

I have a little pickup truck with absolutely no room. This is perfect, it fits under the back seat and you can barely even see it. and the sound is amazing for the price. Very easy hook up. I may add another;)

Pros: Compact size, built in amp, decent deep bass (for the space the sub has to move).

Cons: Now i wanna go bigger......high school style.


Written By RLJ360, omaha ne on Sunday, October 19, 2014

Crutchfield Customer Review (What's this?)

Just installed this unit in my chevy Colorado and am very impressed with the bass sound in a regular cab pickup

Pros: sounds gr8 sure added some punch

Cons: nonesofar


Written By MDClark, Winter Park, FL on Sunday, October 12, 2014

Crutchfield Customer Review (What's this?)

Perfect sub for my crew cab truck.

Pros: size, easy install

Cons: none so far

Sound Ordnance B-8PTD

Written By RZR, Puerto Rico on Thursday, October 09, 2014

Crutchfield Customer Review (What's this?)

Whoever owns a crew cab Toyota Tacoma 2002 (including previous and some late models) know that there is a lack of space to accommodate a normal subwoofer speaker. This shallow sub fits perfect behind the rear seat and adds those low tones I was looking for. No complaints.

Great value

Written By Mike, Reno, NV on Thursday, October 09, 2014

Installed in a 2010 Subaru imprza, amazing sound for the price and such a small unit. I was basically looking to be able to crank it when I wanted but not rattle my brains out the rest of the time. Fulfilled exactly what I was looking for.

Pros: Great sound for the size.

Cons: Mounting for security could be improved

Mini sub in a Classic Mini

Written By DyeLooper, United States on Tuesday, October 07, 2014

Crutchfield Customer Review (What's this?)

Just got the unit, just installed...WOW!! First impressions are it's spectacular. Hope it stays this great for a long time. I installed it in a classic mini, a very small car with a lot of sound. Time to ROCK ON!!!!

Pros: Easy install You can use the remote knob or volume on your head unit if you have a subwoofer output Nice and small and packs a punch

Cons: None yet

Decent Bass For Small Package

Written By Bryan, Chicago IL on Tuesday, October 07, 2014

Crutchfield Customer Review (What's this?)

Works good and fit in the under seat storage compartment in my 04 Tundra Access Cab.


Written By Anonymous, northern michigan on Monday, October 06, 2014

Crutchfield Customer Review (What's this?)

let me start by saying I have a small regular cab pickup. Not sure how this would work on a bigger vehicle. For me however, it is spectacular! The sound is huge for this little package. It bumps me right out of the truck. Havent turned it up past halfway yet! Sounds clean and crisp, no rattling. Installed easily with very clear instructions. I would completely recommend this little guy.

Pros: Small. Huge bass. Easy installation

Cons: none seen yet

8 inch Powered Sub

Written By Jedediah, Pensacola area on Sunday, October 05, 2014

Crutchfield Customer Review (What's this?)

I am totally amazed with this product. It surpassed my expectations totally. I installed it in a standard cab truck and I can't turn it up to full power without it being overpowering . I am completely satisfied with this sub.

Pros: Fit under seat perfectly, has a complete set of adjustments and came with a remote if your stereo doesn't have a level control.

Cons: Haven't found one yet.