Conclusion: Although I've spent limited time listening to the system in my boat cabin (where the Polks reside), so far I'm happy with the sound. They're installed in a dual sealed enclosure (I think 0.7cuft per driver) and they are driven by the 5th channel on a Cadence F100-5 amp and complementing four MB Quart PVL216 6.5" full-range component speakers (which I really like).
Conclusion: Have 2 of these in a sealed box running 250RMS to each of them. They are clear and have plenty of low end. When I first got them I was like eh.....I could use a little more output because I'm used to my JL 12w3v3 but once they broke in they really took off and play all types of music great and get LOUD. Tight on rock (feel it in my chest), boom on hip hop/rap (shakes the whole interior). I recommend them to everyone that is looking for an amazing budget sub.
Rob from Moose Jaw, Saskatchewan, Canada, Sonic Electronix
10 September 2013
Conclusion: I was originally skeptical about this sub due to the low cost and low wattage ratings, but after having this sub for about six months, (and after having been broken in), I am definitely very happy that I purchased it. It doesn't pack as much punch as some other subs that I have owned (Alpine's, JL's) but those were also higher powered and in specific boxes designed for them. This sub is very clean sounding and adds a great low end to your music.
Conclusion: The Polk db1040 is just the ticket. It powers my 2 sets of Focal 5.25" coaxials and a 10" Polk sub thru an Alpine head unit. I have very good dynamic range and no distortion at levels that can go way louder than I will ever need. I like the remote (wired) subwoofer level control to adjust for the varying EQ on my music. An older Alpine 5 ch amp I have in another car tends to overheat and cut out.
Conclusion: The db1040 works perfectly to fill in the bass on normal full range music. I have this powered by the sub out of a Polk 5CH amp that is also powering my 2 sets of Focal 5.25" coaxials. The blend of the bass from the db1040 and the other speakers provide a nice and "full" listening experience in my vw camper van.
Summary: I love these subs! Great quality and tight sound. They are not loud and obnoxious outside the vehicle and actually provide a very tight musical sound inside for the listener. I paired 2 subs, in 2 seperate .67 sealed boxes, wired in para with sound ordinance 1500 mono amp. Don't get me wrong they can get loud, but if you want musical wide range bass performance these can handle the demand.
Pros: Tight sound
Cons: They don't include a protective grille and they're expensive to buy. This is very annoying since the piece of protective plastic is roughly 30% the cost of the sub. Not very consumer friendly.
Summary: I think for the price and power handling these are an exellent buy (buy 1 get 1 half off in Crutchfield). I am running a pair wired in parallel on an alpine 500w RMS mono amp in a ported box and for me i dont need anymore than what these deliver. I would definatly recomend these to a friend.
Cons: The break in period seems like forever, 20-30 hrs.