Hi Cap'n,
Welcome back--I meant to post when you popped up earlier.
Your experience with the M60s with and without your sub running is interesting, and I would have predicted that, because while the M60s have very good bass output, their output and extension is not quite up the M80s, so a sub definitely enhances M60 performance with music or home theater.
I voted "worth it" above because I like the enhanced output and extension of the EP500 with my M80s for classical works with big bass drums and for Wurlitzer pipe organs, etc. However, used on their own with the EP500 switched off, the M80s have terrific bass with music. Still, the sub does enhance things because of the added extension and output.
Alan
