Advice on replacing 12 in woofer in Martin Logan Monolith III's

The MMS of the 30W/4558T00 is the moving mass, it’s some 36g higher/heavier than the SV-12 which says to me it’s not going to be as good at 130hz and 1 octave above, fine for below 80hz but the Monolith panels won’t take to that low frequency too well.

Cheers George

That's good news!   Hopefully he will respond to my inbox.  Thanks for all your help George!

just ran curves on the SV12 in 3 cu ft sealed.... It'll be 3db down @ about 31 hz with a qtc of .79

Thanks for the info Tim.   Finding that driver is the problem  :).  It seems they are very hard to come by so I'm trying to figure out what the next best thing is. 

just ran curves on the SV12 in 3 cu ft sealed.... It'll be 3db down @ about 31 hz with a qtc of .79

I can't be sure about the 3cu ft as I didn't save it, I think with a heavily stuffed ML box that came down to around 20-25hz and around .6 which was I was told by Neville Thiel (rip). Sliightly less efficient,  but that was fine as it was active xovered.

Cheers George