I bought 2 Mal-x 18's to replace 2 other 18" subs I had in two 13.8 cubic foot ported boxes. Each is being powered by a EP2500 amp bridged. The difference after I installed these is much larger than I expected. Where my other subs would start to reach their limits, these bad boys are just getting started!!! I added 4db more @ 20hz with the swap and now after tweaking the amps and EQ, I'm putting out 6 more db @ 20hz!!!!! Amazing subs for the money.
I also shipped these to canada with no problems what so ever. 8 days from order to the subs being installed!