M.L, Ascent #betterwoofer

I'm wondering if anyone can suggest upgrading the 10" woofers in the Martin Logan Ascent with something more robust in the bass region without any consequences. I currently have them bi-wired with a Meridian G55 amp. 
Um, why don't you sell what you have and DIY something with a built in plate amp and DSP?
The issue is I have wired to the amp and The pre-outputs from the receiver (Yamaha A-3060) are being split with two SVS SB13 Ultras. Because of that and as far as I know I can't adjust the frequency filter on the fronts without affecting the subs. I want the Logan's cut off at 45-50hz. This way I can still utilize the P.E.Q. in the subs.