Scott,

Larger speakers, Bose or any other brand, should provide you with improved mid range sounds. Keep in mind that most of the mid range sounds on the Z-5500 come from the center speaker, therefore, a single 8-ohm speaker with a larger cone should suffice.

Good Luck,

Gary

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Travlin' Easy
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)