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Recently I got a Sharp IM-DR420H to add to my collection. When I first saw this unit I was not aware of the 1 bit/4 pole headphone socket, and (of course) the seller lost the 4-pole to 3-pole adapter. I decided to buy it anyway as I didn't believe that connecting a 3-pole lead to my amplifier would make a huge difference. Some people on the forum said it doesn't matter, others say it doesn't sound right and you must use it or the unit may malfunction. I've come up with the idea to create a blind listening test between the IM-DR420H (4-pole socket, without adapter) and the Sharp MD-MT20 (standard 3-pole socket). Two songs from the YouTube Audio Library were used to avoid any copyright issues. How I did the recording; Download files from the Audio Library Use SonicStage to transfer the songs to the DR420 via NetMD in SP-mode Play the files on both devices and record on an external USB soundcard (Behringer UFO202), using a standard 3-pole to RCA lead Save the songs in Audacity to 16-bit WAV-files The volume was set to 25 on both devices, 'Bass' function turned off, and after recording I let Audacity amplify the sound to the default value it automatically selects. The attachment to this post is a ZIP-file which contains four files, two songs played back on each device. Please let me know what you think, I'm very interested! Any feedback is welcome. Sharp_test.zip (109.1 MB)