I am purchasing this sub this morning (used). the person before me had never tried.

What I like about this sub is its finish (it looks a little bit of Mach Audio), it's clean there is nothing wrong about that.

1st Test: plugged into a way of delivering a 1100 CM 20.5 W RMS / 4 Ohms (the label of the sub display 900 W / 4 Ohms).
I begin to gently push the sound of the console, and is a serious enough round, but not too low down either. I push, I push, to the limiting amplifier and the bass does not feel at all.
Aware that the sub should have a concern, I decided to disassemble the front, and I see the two beautiful pieces of 38cm. I disassembled one of them, and I m'aperçcois there are connected to one of a Speakon "input" and one Speakon the "output" ... Super! especially as the back label displays the sub-board there is a filter, whose terminals 2 + and 2 - are outputs medium / high ... Brief
I start the test, with two subs wired in parallel, the sound is already more correct! I replaced the 2 38 by Eminence Omega Pro 15, and then the box is really nickel.
Quality / price ratio interresting, but when you find the ESW 1018 Used for 100 € more ... I turned instead to the RCF.

With experience, I will not repeat that choice.