Hey Steve,
I don't have any experience with the Goertz MI2, but have read good things about it. Unless you go to a drastically different type of cable such as one composed of silver I think Newbee is right and you may not get the big, positive change you're hoping for by changing to a more expensive speaker cable.
In my experience gear such as speakers, preamps and amps have made the kind of changes you're hoping for. I just finished comparing five preamps, and it was amazing how different they sounded both in character and dynamics. One tube preamp sounded small and distant, while another tube amp sounded big, bold and in-your-face.
That being said, I still suspect the long runs of speaker cable might be part of the problem.
How big is your room? I'd think the Simaudio W5 would be able to power the Reference 100s quite well, unless the room was gigantic.
I don't have any experience with the Goertz MI2, but have read good things about it. Unless you go to a drastically different type of cable such as one composed of silver I think Newbee is right and you may not get the big, positive change you're hoping for by changing to a more expensive speaker cable.
In my experience gear such as speakers, preamps and amps have made the kind of changes you're hoping for. I just finished comparing five preamps, and it was amazing how different they sounded both in character and dynamics. One tube preamp sounded small and distant, while another tube amp sounded big, bold and in-your-face.
That being said, I still suspect the long runs of speaker cable might be part of the problem.
How big is your room? I'd think the Simaudio W5 would be able to power the Reference 100s quite well, unless the room was gigantic.