0ur opinion: :12' subwoofer with 4-ohm voice coil * stainless steel-coated polypropylene cone with rubber surround * power range: 50-400 watts RMS (1,200 watts peak power) * frequency response: 25-800 Hz * sensitivity: 90 dB *
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Even \"awesomer\" than Kenwood's 10\" sub ...
See my recent review of the similar Kenwood KFC-W2511 10" subwoofer which was quite favorable too.
I just upgraded to the 12" sub and put it in the same 1.12 cu. ft. 3/4" MDF sealed box that I previosly had the 10" sub in (put the old one in wifey's car). I found the 10" sub when at the highest levels of my amp's 300W RMS power were close to the very limits of the smaller sub's power rating and wanted to have a little extra room so I upgraded to this 12".
While I don't often crank it so loud, at times I do (tailgating at football games with the hatch open for example) and this is where the difference over the 10" model is really noticeable.
The 12" version of this sub is an absolute BEAST for a single 12" sub. Driven with a strong amp from a high voltage RCA signal from a quality head unit this thing is incredibly loud and clear and probably can pulverize any kidney stones you might be carrying.
I had previously also used Pioneer's Champion series' 12" sub in this very same 1.12 cu. ft. sealed box and the 12" Kenwood, I guess due to its higher 90db efficiency rating (vs 87 on the Pioneer) is clearly louder at the same volume levels.
Sound quality is excellent at all volume levels and even at absolute max volume with the bass totally boosted on my amp's + 12db knob there is no clipping or distorting whatsoever and the thing totally thumps every seat in my Mitsu.
The system in my '98 Mitsu Eclipse GST is:
Pioneer Premier head unit driving the smaller speakers and a Pioneer GM-D8400M mono amp (300W RMS, peak 1200W) pushing this subwoofer.
Buyer's feedback: 
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Best bang for your buck
Picked Two of these up, put em in sealed box with 2 farad cap and 1000watt amp in 08 civic coupe. These subs put out some serious bass easy install great clean sound. Highly recommend for anyone looking for subs that give the best bang for your buck.
Buyer's feedback: 
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* Great price and good quality ...
I am not a professional installer or anything but these were very simple to install and they have good base to them. Currently I have a sony xm 2002gtr powering one of these subs and I have another one of these on the way. Right now, the one I have hooked up hits nicely. It has a pretty clean sound to it and I am very happy with this sub. I recommend for first time buyers and for people who know a little bit about this stuff. Easy to install, good clean base, and they are a great product for the price. I do not think there are very many deals out there like this one right now.
Buyer's feedback: 
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Great
2 plus the 9103d amp will give you a great clear low deep ear ringging bass
Buyer's feedback: 
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* Kenwood KFC-W3011 12\" 4-ohm subwoofer ...
Excelente!!! a pesar de que lo compre pensando que era doble bobina estoy satisfecho con el producto, muy buen vendedor, muy buen producto.
Lo recomiendo 100%