nandric,
hearing a difference is not the same as making qualitive observations. Of course, gross differences can be heard, but I am referring to subtle ones. Is there a little more air, a little tighter bass, a little more clarity on the cymbals, a little more forward in the midrange. That is a lot easier to determine in 5 seconds between switching inputs, not so much after an hour, and the loss of concentration while changing and aligning a cartridge. If you can, more power to you. I can't. Not with any certainty anyway.
hearing a difference is not the same as making qualitive observations. Of course, gross differences can be heard, but I am referring to subtle ones. Is there a little more air, a little tighter bass, a little more clarity on the cymbals, a little more forward in the midrange. That is a lot easier to determine in 5 seconds between switching inputs, not so much after an hour, and the loss of concentration while changing and aligning a cartridge. If you can, more power to you. I can't. Not with any certainty anyway.