Ahh, the ART-7 is very low output. I found this...
"According to an insider at Audio Technica (Japan) the ART7 is more for classical music because it has better micro layering of soundstage. ART9 on the other hand is a much more of an all rounder because it has a very powerful presentation which suits Jazz, Rock and Pop along with classical. ART7 doesnt have the macrodynamic force that the ART9 has. Moreover ART7 is an extremely low output cart making it a difficult cart for phonostage matching. The ART9 is much more friendly in its output voltage and matches with any decent phonostage."
"According to an insider at Audio Technica (Japan) the ART7 is more for classical music because it has better micro layering of soundstage. ART9 on the other hand is a much more of an all rounder because it has a very powerful presentation which suits Jazz, Rock and Pop along with classical. ART7 doesnt have the macrodynamic force that the ART9 has. Moreover ART7 is an extremely low output cart making it a difficult cart for phonostage matching. The ART9 is much more friendly in its output voltage and matches with any decent phonostage."