I am wondering why you didn't buy the
Dali Helicon S600 Subwoofer instead of the Earthquake subwoofer. The Dali sub is a perfect match for your main and surround speakers. It also has more WAF (wife acceptance factor).
P.S. If you change you mind about the Supernova, you can donate it to me and buy yourself a Dali sub. I will send you a tax deductible receipt for IRS.