I had originally purchased a Grado Platinum, high output version which Grado lists on their website on the same product line. I dont know if yours is the high or low output as Grados descriptions are vague at best. I ended up with the Shelter and do indeed like it better. The bass is much more defined to my ears & the trebble is better as well. I do seem to like a brighter sound and that is what I got with the Shelter. Perhaps this will help in your question.
Regards, John
Regards, John