Hello,   so I have Benchmark DAC with headphone amp with 1/8 jack inputs. My headphone has cable with remote control and mic for iPhone which has 4 pole jack connector (I believe these are called TSSR).  With standard 3.5mm to 6.35mm adapter, the sound is distorted as the poles just won't...

Hello,   so with todays digital technologies, why aren't all the headphones perfect? I mean, if you can precisely measure the output of the driver and its frequency and phase responses, why don't manufactures employ some kind of digital preamping or equalizer which would completely eliminate...