I bought this type of product about 2 years ago because I had to make the outdoors, I needed something cheap with the performance (announced for 500 W RMS 95 pice). I bought 4, I type in crates al ESW1018 FCR amplified Inter-M M 2000 (2x1000 W RMS) and I must admit that for the price, makes a not too bad. Of course, do not expect exploits, but these Subs Entirely satisfied me for these accessory. (Also, my dealer sound quite skeptical t surprised by the performance).
The record low is really excellent, but of course, compare the FCR or B & C is a little less violent. Compare prices ... it's a bit normal.
I also tried the DDW 1595 (38cm 400W RMS) at Music-Force ( www.music-force.fr ( http://www.music-force.fr ) ) coupled with an engine "of the same brand, amplified with an Inter-M M1500 (2x750W RMS). Of course, a small but necessary qualisation economic term, these products are really interresting.
Correction: Fvrier 2009, having tried many more models (JBL, RCF, Eminence), these HP are really spoiled ...