I know I'm too crazy about suboctave, but.. It's interesting 1) What is the quality of the suboctave built in amps like Ashdown Magnifiers and SWR Mo' Bass? How well does it track, compared to stompboxes? Is it true it can track even the low E? 2) How is the suboctave frequency supposed to be reproduced, in the sence of speakers? E.g. there are Ashdown combos with the same suboctave feature... Is a powered subwoofer necessary to hear it?