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I asked the same question directly to David Zhezhe.
"The MK III and MK IV are both based on the same SEPP OTL in Class A design,...
Just one help.
I bought one Fostex modded on ebay from mayflowerelectronics. The sound is good, the hardware (headphone) is broken.
Wich one do you prefer (between HD650 and DT990) ??? I' have HD650 and I'm thinking to buy a DT990.
One question. I have Burson HA160 hedaphone amplifier and Sennheiser HD650 that works very fine with my amp. I'd like to buy one Beyerdynamic...