I don't have any experience with sealed subs. It would be nice to hear one with a 15" woofer that supposedly goes down to 10 Hz in most rooms.

My plan was always to add at least one more EP600, but depending on reviews of the ULS-15, I may try integrating one. But yeah, I would love to hear a system with four EP600s.

I wouldn't use the wireless of the ULS-15. I'm glad to see it has balanced connections.
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SuperGrand UltraDeluxe (Plus Extra More)