Just wanted to share these. I had these cups for sale under my non-commissioned work and they were purchased by a nice guy named Jim. He had some MS1's that he wanted the cups for. He sent me the cans to install the cups and complete a couple driver mods on for him. I'm not sure what may have changed since the last set of MS1's I modded with wood cups and the bass hole/sticky tack driver mods on, but these things have pretty beastly bass! Not only that, I don't hear one single hint of sibilance which is typical for the lower to lower/mid-range Grados. Now...these are technically Allesandro's which are a professionally modified Grado driver, which are known to have reduced that upper end sibilance...but these are quite impressive.
I've been pumping Wolfmother and Linkin Park's "A Thousand Suns" through these things as I have been catching up on things and it's been really pretty awesome.