I've always heard that there's not much benefit to surround rear speakers. But since I had it anyway, I stuck it on the back of my couch.

I would not recommend spending money for rears since the QS8 surrounds do such a good job, but then I already had the 150.

So I'm running 6.1 with 150 doing the surround rear duties.

I would think that's a better use then mating 150 with a 180.

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Denon 4520, EPIC80/500/VP180 Speakers