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

@georgehifi 
@stevepa
if it indeed 3 cu ft... this is expensive ($245 each), but ran curves F3 in QB3 alignment is 25hz 
Peerless  835017
If the box is a smaller, there are others that can work for less money.

again, based on 3 cu ft......

ScanSpeak Discovery 30W/4558T   This looks good.

Peerless 835017

I think I remember looking at this, but remember the the distortion was better at 150hz on the SV-12. But the main thing for memory that turned me off it was that it’s only 83db where the SV12 was 89db and the ML panels are also 89db.

Cheers George

ScanSpeak Discovery 30W/4558T

This is better 89db, but investigate the distortion at 150hz and 1 octave above (300hz) compared to the SV12.

Cheers George