Sound Ordnance B-8PTD

125-watt compact powered subwoofer

Outlet: Open Box

Item #: 777B8PTD

In Stock

322 Reviews | 22 questions - 86 answers


Outlet Savings:-$20.00

Your price: $179.99 Earn up to 180 Rewards points

Add to Cart Free Shipping Lifetime Tech Support

+ Add to wishlist + Email me alerts for this product

New Stock: $199.99 Scratch & Dent: $169.99

View all associated offers




We don't check this item for fit or compatibility.

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:

322 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

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.


Written By Justin, Sequim, WA on Thursday, October 02, 2014

Crutchfield Customer Review (What's this?)

What great punch from such a compact unit! Had trouble finding some sub for my Tacoma single cab but this was "The One". Fits perfectly under the seat and install was a breeze! Great for those looking for some low end but don't have a ton of room.

Pros: Compact, great sound, easy install.

Cons: None as of yet

Sound Ordnance B-8PTD

Written By John, Clayton, NC on Tuesday, September 30, 2014

Crutchfield Customer Review (What's this?)

This little sub fits nicely under the back seat in my Avalanche. It almost has too much bass in fact I find myself adjusting it based on the song playing. The rotary knob makes this task a lot simpler

Pros: Lots of bass from a small package. Easy install with options for high or low pass hook ups.

Pleasantly Surprised!

Written By TimR, Dallas, TX on Friday, September 26, 2014

Crutchfield Customer Review (What's this?)

So I wanted something very small that would be easy to place where it would not be seen, or in the way of passengers or storage in my 2003 Silverado Crew Cab. Although I had already replaced the speakers in the doors, I couldn't get over the fact that the bass sounded like the truck's doors. This little unit easily fit under the back seat on the driver's side of the truck.I figured it would be just enough to fill in the bass and get rid of that "door" sound in the bass, but when I fired it up I was quite surprised to find out this thing really rocks! No, I'm not going to win any SPL competitions, and no it doesn't play to 18hz, but it far exceeds what I expected.

Pros: More bass than you would expect in a unit this size Very easy to install in tight spaces Non-obtrusive in the cabin

Cons: Haven't found any cons yet. Maybe the remote volume knob could be a little smaller.

Just what I needed.

Written By Mark, Washington on Wednesday, September 24, 2014

Crutchfield Customer Review (What's this?)

Sounds great... easy to install. Love it. Nice boomy bass.

A really fun box.

Written By Falcon R19, Seattle, WA on Wednesday, September 24, 2014

Crutchfield Customer Review (What's this?)

I have been around high power sub system. This is my first self powered sub unit. I chose it bc it fits under the seat perfectly and give out a lot of thumb only on half powered. Powerful, compact, less installation hassle and great bass quality in one small pack. Crutchfield is the best place to get your geeky gear and excellent customer service on on your purchase.

Pros: Small compact size. Great bass quality. Easy to install and operate. Great value for money, only at Crutchfield.

Cons: None

Sound Ordnance B-8PTD

Written By Anonymous, Lakewood co on Tuesday, September 23, 2014

Crutchfield Customer Review (What's this?)

Amp works great. Provides good bass without being a big boom box. Installed in my Porsche 944 is the spare tire well.

Pros: easy to install

Cons: none

Rumble Seat

Written By Rich, McKinney, TX on Wednesday, September 17, 2014

Crutchfield Customer Review (What's this?)

Bought this sub for my Jeep Wrangler. Fits under the front seat fairly well but the mounting brackets did not work very well for my install. This compact 8 inch sub provides surprisingly good mid-low bass. If you want solid clear bass without the boom, this sub is a great choice. It is great for classic rock but it tends to bottom out on Dubstep. If you are looking for massive boom to annoy other drivers at the red light, this is not the sub you want. This Sub works great with top off the Jeep, a much needed improvement from the OEM system. I'm considering the 10" version to give a little more low end but I would recommend this sub to anyone with Jeep looking for additional bass. Would give it 5 stars but the mounting brackets could be better.

Pros: Compact design, good mid-low bass, easy install.

Cons: Mounting brackets are two pieces of plastic and do not mount/screw directly into the unit.

Customer support :)

Written By Onehappydude, Wellsville on Tuesday, September 16, 2014

Crutchfield Customer Review (What's this?)

For only being 8 inches this thing is fantastic. Lots of sound, it's perfect for my jeep wrangler considering there wasnt any bass in it at all before. The only thing wrong was it stopped producing sound after 5 months. I got floor mats for the "trunk" and had to take it out and just put it back in. I've had to do that a couple times to vacuum the back but after like the fifth time it just stopped working. The power would come on just no wub wub from the bass. the screw for the wire from the battery to the sub was also really stripped by then. I saw it had a 3 year warranty so I called up costumer support and they said well I guess we'll just send you a new one. I was shocked haha. Nothing ever with any customer support has been that easy. I just told them it was working for 5 months then stopped and boom! A new one arrives 3 days later. They immediately sent me a shipping label so i could ship my old one back for free. Luckily I kept the box it came in. Then in 3 days my brand new sub came and it works like a charm. I couldn't be happier with this site. No arguing if my sub really didn't work, no arguing on how I might be able to fix it. They just said OK. It was a great relief from the other crummy sites.

Sound ordinance

Written By Hector, Del Rio on Tuesday, September 16, 2014

Crutchfield Customer Review (What's this?)

I got this and being a but sceptic due to the amp n woofer was all in one, it sounds and looks great. Highly recommend it if your short on space.

Pros: Compact and sounds great.

Cons: None

Nice price, good sound production

Written By Chuck, Pa on Sunday, September 14, 2014

Crutchfield Customer Review (What's this?)

I am happy with this product. It provided the amount of bass I wanted and some more if I want. I am also happy with the phone support provided by crutchfield. The couple questions I had were answered easily by them, almost like having them with you to guide the installation.

Pros: Fits nicely in limited space. Installation good. I have a honda crv and subwoofer inputs were already in place. Provides the amount of added base that I want, was not looking to vibrate the whole vehicle.

Cons: Have it a couple of weeks, no cons yet.

good for the price and great CS

Written By Architekt, Miami, FL. on Thursday, September 11, 2014

Crutchfield Customer Review (What's this?)

I would give 5 stars, but the first unit received didn't work. Called Crutchfield CS and they sent a replacement right away. The second unit received worked immediately, but was connected in Auto Mode power. For some reason was not turning on all the time or was turning off when the head unit volume wasn't too high. Then I wired the remote wire to a 12v power source and set the switch to remote wire. now works every time I turn on the head unit. Sound quality is good (still working on the fine tuning) compliment my sound system very good. I'm happy so far with the purchase. Crutchfield Customer Service A+

Pros: good price and good sound

Cons: SO quality control apparently not the best (forgot to mentioned that second unit received came with remote control unit broken. just grabbed the one from the first unit received) but with a 3 years warranty I would go for it with no worries.

A Descent Sub for the Price

Written By Anonymous, Annapolis, MD on Wednesday, September 10, 2014

Crutchfield Customer Review (What's this?)

Was looking for a powered sub to add to the recently installed Alpine system in my 2004 Dakota Club Cab. I was hoping for an under-seat option, and this seemed the most likely candidate. While it does fit under the seat, it is a tight fit and I can feel it through the seat cushion, so I removed it from there and it is now sitting just behind the driver's seat.

Installation was straight forward for the most part. The instructions for wiring it are a little vague, however. And if you're going to use the 10 gauge wiring kit Crutchfiled recommends, know that fitting the power and ground wires into the terminals on the back of the unit is difficult. The terminals could definitely stand to be a little wider to allow them to accomodate a 10 gauge crimp-on spade or ring terminal (it definitely does not currently).

Once installed, sounds very good. Very little distortion. It isn't high-end by any stretch, but you get what you pay for usually. It does the job I wanted it to do.

Pros: Inexpensive way to add a sub to your system.

Cons: Terminals too small to accomodate proper gauge ring or spade conectors.

Mild but nice.. Great Warranty and CS

Written By Foster, Florida on Friday, August 29, 2014

Crutchfield Customer Review (What's this?)

This is a great sub if you need that extra little punch to fill out your sound. This unit is not going to rattle your windows. You're not going to rattle your doors either. It is weaker than a separate sub / amp set up for sure but if you're like me and only have space under a seat then it's a great alternative. You can tell the minute you pick this up due to it light weight that it's not going to blow you away. But it is nice enough to get a thumbs up for what it is and for the price. I am actually here to commend Crutchfield's CS. I have had mine for 1.5 years and just the other day noticed the remote would spin all the way around rather then have stops on both ends. At the same time I noticed the sub sounded blown when it heated up and I would crank it up. I called in to ask about replacing/buying the remote to see if that would fix the issue and was told a complete new speaker would be sent. I didn't know it was still under warranty and that it is a 3 year warranty on top of that. Just can't beat that! Happy Crutchfield customer.

Pros: Fits under my seat, helps fill the sound range. Warranty and Customer Service unbeatable. EZ install. Remote volume control.

Cons: Not deep and punchy. My remote broke. Remote feels like junk.

Nice unit

Written By Anonymous, Collierville, tn on Wednesday, August 27, 2014

Crutchfield Customer Review (What's this?)

All was just as advertised and reviewed except one thing. Using speaker input I was not supposed to need a remote turn on wire. However, the sub would not play until I hooked it up to the remote turn on. This added some difficulty to the install since I already had run a power wire from the battery. I could have run both wires together had I known.

2012 jeep patriot with factory radio unit


Written By Travis, Brandenburg,Ky on Tuesday, August 26, 2014

Great product! i first installed the B-8PTD in a 2006 Subaru WRX STI it fit under the passenger seat perfectly and sound quality was outstanding. I've since sold the STI but kept the sub and it is now in my K series Chevrolet wouldnt give it up for anything!

Pros: Small design fits in most places

Cons: Wish I had two!!

Compact Sub Woofer

Written By David, Iowa City, IA on Friday, August 22, 2014

Crutchfield Customer Review (What's this?)

For the ease of installation and money spent; this is a really great way to add solid bass-end for a car stereo, I have a 2004 Honda Pilot and had one similar unit under the drivers seat. I purchased the second one for the passenger-side seat. One unit rocked the car and now with two of these subs it is unbelievable solid base. (I fear I may blow the side mirrors off the car). At all listening levels the base is right on-spot. Takes a bit of tweaking to get it perfect but the key word is a "bit", an hour at most and you have solid undistorted bass until you go beyond 11 on the volume knob. I fine-tuned my subs to the Foo Fighters' song "Tired of You" and results are spectacular. Front and back speakers are Kickers and the sonic quality of the song in the car (at all speeds) is like being in the recording studio - which for a car stereo says a lot. (My head-unit is an Alpine CDE-W235BT and the source was my ipod). If you need more bass and you can fit these units under your seat -or anywhere else - you should definitely consider going this route,

Pros: Great bass. Great price. Easy to install. Fits under many seats or, if not, is small enough to fit in a lot of small spaces.

Cons: I wish the hook-ups (power, ground, and input) were on the long side. I had to use 90 degree RCA adaptors to get the units under my seats. Maybe Sound Ordnance will consider this as an option?? The other Con is that the stereo system sounds so good I want to spend more time/money in putting in sound dampening on the doors to even further improve the sound quality.

big sound, little box.

Written By Anonymous, Brunswick, GA on Wednesday, August 20, 2014

Crutchfield Customer Review (What's this?)

good reasonable base, better than cheap cylinder bazooka type. will not take up much space. You can use this with a powerful receiver and efficient speakers and NOT need a HUGE separate amp!!!

Pros: deep base

Cons: wiring kit is made for a HUGE separate amp. You will need smaller terminal connectors and use a 15 amp fuse not the 30 amp that is used for a huge amp.