[quote name='Conan' timestamp='1426518028' post='2718724']
This. Probably...
Interestingly, back in the day when I had the archetypal Trace Elliot "stack" (1048 and 1518) I used to prefer the sound with the 4x10 on the bottom and the 1x15 on top. Both cabs were the same width and depth so it made no difference to their "stackability", but it did affect the sound (to my ears, standing right in front of it).
Ironically, the 1x15 had more definition and more top end than the 4x10!
To the OP - they are your cabs, put them however they sound/look/feel best. If you've got long speaker cables, try one on each side of the stage!
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There's no reason why the 115 wouldn't have more top end than the 410. Billy Sheehan purposely uses 15's to run only top end and 410's for lows. That big neck pickup on his bass just runs through the 410's he uses.
What I've never been able to figure out is, if the traditional given is smaller speakers for high and top end, why do guitarists use 12's?