Dave,
Prior to my buying the magnesium arm wand I used the regular aluminum wand with various MC cartridges including some that were much more "aggressive" than the Shelter including the Spectral, VDH Grasshopper and others, with no issues that I could definitely attribute to the aluminum wand. I think you would be fine with the aluminum; you can always easily add additional mass and/or damping to the wand. I will say, however, that on Dover's recommendation I went back to the aluminum wand when I started using MM's again with beneficial results. You can extrapolate from that experience. In general, the Shelter behaves very well in the ET2 with well controlled highs. The issue of output is curious. The Shelter plays almost as loud into my EAR phoo stage as a Benz Ruby H which has an output spec of .8mV @ 3.54 cm/sec; go figure.
Prior to my buying the magnesium arm wand I used the regular aluminum wand with various MC cartridges including some that were much more "aggressive" than the Shelter including the Spectral, VDH Grasshopper and others, with no issues that I could definitely attribute to the aluminum wand. I think you would be fine with the aluminum; you can always easily add additional mass and/or damping to the wand. I will say, however, that on Dover's recommendation I went back to the aluminum wand when I started using MM's again with beneficial results. You can extrapolate from that experience. In general, the Shelter behaves very well in the ET2 with well controlled highs. The issue of output is curious. The Shelter plays almost as loud into my EAR phoo stage as a Benz Ruby H which has an output spec of .8mV @ 3.54 cm/sec; go figure.