I have a pair of 12" Polk Audio GNX124 Subs. I just saw online that Polk/MOMO came out with a new sub called Polk/MOMO2124. On Crutchfield.com, the MOMO's are 140$ per sub. And the GNX are 160$ per sub. How come the GNX costs more, even though the MOMO's are newer? I was just wondering If I should keep the GNX's or get the new MOMO's. And can someone plz tell me which one is better?