Thanks for checking George.

If I read my D2500 manual correctly (and from experience of Asaposts's previous stereo DSP5000 system), there is no limit to the number of subs which one can add to an all-Meridian DSP setup. One can only add three to a 5.0 or one to a 7.0 system as dedicated LFE channels but it seems that subs can be daisy-chained into DSP pairs either as a mono sub summing the two channels or as a stereo pair supporting each speaker channel. So, for instance, a D1500 placed appropriately could be added to rear channel DSP33s (set to large) so that the full-range bass is reproduced from small speakers.

Imagine 7xDSP8000s each with its own dedicated D2500. Maximum full-range bass correctly positioned all round without the need for a .1 channel.

In the spirit of Spinaltap, I would like to confirm that I am not involved in the corrupt theft of a global sport.