I own the 7506 and they honestly don't sound good compared to anything else I still have. They do excel in noisy environments though since they isolate so well. They're also built really well and are fairly portable. I kept them because of all that. I never use them at home. Even the $20 KSC-75 phones sound better. I've never heard the MS-1 but I'd bet it sounds better, but isolates worse, than the 7506.
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Headphones: Beyerdynamic Terminator V4 Cocobolo BlackMax, Beyerdynamic DT880 '03 + BlackMax cable, Koss KSC-75 + APureSound cable, Sony MDR-7506 + Beyer pads
Head/Pre-Amplifiers: Audio-gd Phoenix, Audio-gd C-2C, Emotiva RSP-1
Sources: Audio-gd Reference One, Cambridge Audio Azur 840C, Musiland Monitor01-USD, Cambridge Audio DacMagic, Sony PlayStation3 60GB
Portable Sources: Sony NWZ-A818, Sony NWZ-W202
Speakers: D-Sonic Magnum 1000S > Paradigm Signature S6 v.2, JL Audio Fathom F112
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