I would still use a VP180 with the M60s. As mentioned, the VP150 sounded thin. The other problem that I had was for some concerts where the bass guitar comes mostly from the center, it was very weak. It is just a better speaker overall if you can accomodate the size. I had both at the same time in my house and for me, it was worth the extra $300, for others, it might not.
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Bruno
M80s/VP180/QS8s/EP600/AVR-890
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"The problem is choice..."