Excellent headphones. These closed back cans go deeeep and put together a good sound stage. Too much bottom for my ears though. I actually prefer the hotter high end of Grados, not to mention the open back design. Good isolation both in and out. No issues, just not for me.
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One reviewer states (a fair and accurate description IMHO) that "comparing the DT-1350 to the Sennheiser HD-800 and Beyer DT-48E (2011 version), the DT-1350 has a very pronounced emphasis in the "AWWWWWW" region of the midrange, while the HD-800 has a mild emphasis in the "EHHHHHH" to "EEEEEEE" region, and the DT-48E a mild emphasis about halfway between those two. The headphone I have on hand that most closely matches the midrange sound of the DT-1350 is the Sennheiser PX-100-II (modified to remove the center of the foam cushions), and while the PX-100-II has less of the midrange emphasis than the DT-1350, the DT-1350 has greater clarity and high-end extension which is to be expected given its price range.
Bass with the DT-1350 is similar to the HD-800, but somewhat stronger in the 40 to 60 hz region. People who like "full strength" bass should like the DT-1350, since the bass is strong without being excessive or boomy. Bass detail is very good with the DT-1350, and is strong and clear down to 32 hz or lower.
The DT-1350's highs are smooth and comparable to the HD-800. One of the things I compared was part of Beethoven's 9th symphony, 4th movement (Solti/Chicago/1972) following the first vocal break where there are some triangle sounds that resolve very well on both headphones.
My overall conclusion is that the DT-1350 sounds more forward in the midrange around 400 hz or so compared to the HD-800 and DT-48E, yet has smooth and detailed bass and highs, and so will likely appeal to people who find headphones like the HD-800 too laid back and polite, or too bright in the upper midrange. One thing I especially like with the DT-1350 is how the bass has some of that "reach out and grab you" visceral impact, which few headphones can duplicate and still be fairly tight and detailed."