Brady, the small difference in the tweeters shouldn't have a very significant effect with wide dispersion QS surround sound, so there shouldn't be any hesitation there.

As to VP100 to VP150, I'd suggest that you consider a vertical M2 or M22 instead. First, for a free "upgrade" to the VP100, turn it up to a vertical position if your setup would permit.

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Enjoy the music, not the equipment.