0ur opinion: :Kenwood is a leading developer and manufacturer of audio and video products for home, car, and personal use. lt is recognized by consumers and the consumer electronics industry for providing superior quality, reliability and value.PR0DUCT FEATURES:Passive radiator type;16 cm silver-coated drive unit (Dual voice coil);16 cm silver-coated passive radiator;Build-in amplifier;Remote controllable variable input sensitivity;Remote controllable variable low-pass filter cut-off frequency;Remote controllable phase reverse switch;Speaker level input from 0EM car radio for easy up-grade;Horizontal or vertical installation capability.
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Good product ...
I gave it 4 stars because there is some distortion when used at high volumes. Other than that sounds great, and will not blow out your ear drums!
Buyer's feedback: 
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Excellent Powered sub for price
This was an awesome sub package. Amazon had the best price for it by far. I put this in a 528 bmw, with factory head unit, and upgraded speakers from "bavariansoundwerks". It fills in the low bass notes that my midbass speakers miss. The sound is clean and crisp. I found installation quite easy after much study and preperation while waiting for package in the mail. I placed this unit in the trunk and have been happy with its performance there. Of course inside the cabin would probably be much better but I like every availabe nook and cranny in my cabin...the trunk was only option for me. Some may feel that the unit isn't powerful enough to penetrate through to the front..and that is slightly true but it's good enough for me. If you want strong bass and can mount it in the cabin then that's the way to go. If you buy it for about 160.00$ on amazon you will be totally satisfied. If you pay 250 "somewhere" else you may began to wonder if there were better offers for the price.
Buyer's feedback: 
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* Big Hit With Teenage Son ...
I bought this for my 17 y.o. son's birthday and we had it installed professionally. It is in the trunk of a 1989 Toyota Corolla in which we had already upgraded the receiver and speakers a couple years ago. The new speakers really lacked in the bass, thus the subwoofer. This thing is LOUD! Perhaps it is the small vehicle size but I am glad we did not get it to fit inside the passenger compartment. He is totally thrilled with it and I have to admit that it really improves the sound in that car's system amazingly. We'll see how long it takes for him to blow it up...
Buyer's feedback: 
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Outstanding in the right application
Installed it behind the front seat of my S10 standard cab pick-up using the line outs from my cheap Pioneer head unit. It gives me all the bass I would ever want and fills in the gaps left by my Kicker speakers. I couldn't be happier.
Buyer's feedback: 
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* Solid performer -- notes on 1999 Outback installation ...
Like many reviewers, here and elsewhere, I chose this subwoofer mainly to save on space and to simplify installation - i.e. no separate amp. No car I've ever owned has had a subwoofer, but now that they're standard on home theater and PC speaker systems, the absence of bass in the car had become noticeable. I wasn't seeking the other extreme of conspicuous pounding low frequencies, and I wanted to preserve the cargo space in my 1999 Outback wagon unobstructed by a speaker box. The KSC-SW1 certainly meets my needs, filling out the mids and trebles without upstaging them. Even though my Pioneer head unit will control the subwoofer volume and low-pass frequency, I find the wired remote very handy for making quick adjustments based on the kind of music and the driving situation.
Some notes on installation, for do-it-yourselfers:
I'd planned to hide this under the driver's seat of my Subaru, but discovered that it wouldn't fit because of that seat's two steel cross-members - btw, the KSC-SW1's dimensions are 15-3/4"x 3-9/16"x9". Luckily the passenger seat does have enough space underneath - just barely, but this is actually a plus because you do want this thing to stay snugly lodged in place. (I had to remove a 6-CD changer that I wasn't using anyway because of the mp3/USB head unit I'd installed.) I also tried the velcro approach to anchoring the unit to the carpeting (using the "xtreme" version). Though it wouldn't cling very well, the seat rails hold down the unit vertically and the velcro hooks do keep it from sliding horizontally, the only possible direction it can move while under the seat.
The 19-ft wiring harness is much too long for an under-seat installation, but the Outback's center console has a big enough cavity to stuff all the unused wiring inside. I used the RCA inputs but didn't want to cut the speaker line-in wires. Likewise the excess length of the yellow power and blue continuity wires, the ground wire, and the remote cable are all bundled and tucked away inside the console space, so the harness is intact just in case the next car I put this in requires a longer run.
Like many aftermarket head units, my Pioneer has a blue "system remote" wire to turn the unit on and off with the ignition (a power antenna lead also works), but I had wondered about tapping into the yellow power wire directly from the HU (as the Kenwood instructions appear to want you to do). It made more sense finally to run the subwoofer's heavier-gauge power line directly to the battery, with the black ground wire attached to one of the seat's floor bolts. To get the wire to the battery, look for a diamond-shaped silicone grommet in the firewall just above the gas pedal. You can poke a little hole through that and pull the yellow wire through to the battery - it's plenty long! Good metal-to-metal contact for the ground wire is also absolutely essential for the internal amplifier to work.