if you want to feel and hear the cannons in "1812", then you will get it much better if you also have a subwoofer that can reproduce, at high levels, frequencies down to 20 Hz;
10-12 Hz would be even better. those will make your cannons really effective.
also good for big organs or Bosendorfer grand pianos.

you will also need a very powerful amp to reproduce those peaks without clipping or compression.

the M80s can take lots of power, check this:http://www.axiomaudio.com/research_PowerTestRoom.html

hope this helps. :-)

See: http://www.blu-ray.com/community/gallery.php?member=Gelli
or: Axiom Gallery