Aloha,

I'm wondering if anyone might be able to help me with this problem I've encountered. Thank you in advance. Recently my M&K MX-125 sub started not functiong like before. The sub level when turned up only works at 2 certain points, all other spots it makes a whurring sound (like a helicopter) and the cone itself is moving in and out very fast. I hope it's nothing too serious since I didn't purchase it at an "authorized dealer" (pawn shop deal of the century) and have no paperwork for it. Well, thanks for reading my post.

Mahalo again,

Chris (ironbird01)