Dear Ray: You can find information here: http://www.cartridgedb.com/tools.asp
Now, I own Grado cartridge and I mount on different tonearms ( One with an effective mass like your Zeta ) and runs very good, I don't think that you could have trouble about and for what you report what you are hearing is great: don't worry about, normally the MM cartridge sound is more natural.
Regards and enjoy the music.
Raul.
Now, I own Grado cartridge and I mount on different tonearms ( One with an effective mass like your Zeta ) and runs very good, I don't think that you could have trouble about and for what you report what you are hearing is great: don't worry about, normally the MM cartridge sound is more natural.
Regards and enjoy the music.
Raul.