Dvavc - Wilson doesn't modify the Scans ... they are build to their specs at SS factory, in Videabek, Danemark.
Having been in Scan Speak factory and having spoken with their head engineer - Mr. Lars Goller - I can tell you that most of the manufacturers order the drive units to their specs, so chances that Wilson uses the standard 8545 are minimal. 4 Ohms voice coil is only one of many mods you can order. Wilson probably also orders a shorter voice coil for higher sensivity too.
I have had a pair of 8545 mid woofers made by Lars for my car - they were 91dB and 4 Ohm.
Having been in Scan Speak factory and having spoken with their head engineer - Mr. Lars Goller - I can tell you that most of the manufacturers order the drive units to their specs, so chances that Wilson uses the standard 8545 are minimal. 4 Ohms voice coil is only one of many mods you can order. Wilson probably also orders a shorter voice coil for higher sensivity too.
I have had a pair of 8545 mid woofers made by Lars for my car - they were 91dB and 4 Ohm.