If you set your XOver at 80 Hz, there probably will be little perceptible difference in the sound as you are strangling the lower extension of the 180.
My Audyssey 'hears' my VP160 at 40 Hz & I expect that the VP180 would be similar or even lower.
I've tried mine at both 40 Hz & 60 Hz & settled at 60 Hz. It gives a 'fuller' sound to the all important CC without exaggerating male voices that can result in 'chestiness' if not done correctly in the speaker design.
Try lowering your XOver & you will probably hear a pleasant difference...
TAM
