Grotto v. Grotto i

[satellite400]

Hello everyone,

I have decided to pick up a Martin Logan subwoofer to compliment my music system. I want to at least get a grotto for the servo control; however, I am wondering if there is a significant difference in sound between the original Grotto and the "i" version. I haven't seen much about the comparison between the two versions.

If anyone has any opinions on the difference between the "i" and the "non-i" subwoofers I'd love to hear them.

Thanks,