Dgarretson, I have not heard the ART7 so I cannot comment on its sound per se. Its heartening to know that it can be amplified without SUT. Here is an email that was sent to a friend of mine by Audio Technica:
Mr. Rodrigo Thomaz from Audio Technica send me follow reply to this question:
Hello,
if you prefer to listen to multiple orchestrate classical music, we
recommend the Non-magnetic Core Moving Coil cartridge AT-ART7.
It can reproduce more sensitive sound of each instrument.
However
if you prefer more dynamic music like jazz/pop music, we recommend you
use the Magnetic Core Moving Coil cartridge AT-ART9. It will deliver
much more presence with rich low mid frequencies.
Hope this can help. Kind Regards, Rodrigo Thomaz