I personally have owned the HP-2, RS-1, and HD650, and I found the HD650 was sonically bested by the HP-2. If in fact the PS-1 is sonically superior to the HP-2 that would indicate to me that it is in fact superior to the HD650. This is assuming the the PS-1 has the same sonic "signature" or lack there of of the HP-2. I will say however that as far as I can see by examining the pics of the PS-1, I am not too impressed with the build quality. The hex into round plastic did not impress me on the RS-1, and will not impress me on the PS-1. Although a minor point, I am impressed with the engraved lettering on the PS-1.
Trevor
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