I've noticed that previous reviews of the metal version have been generally positive, while reviews of the plastic model have been mostly negative. was from a third party made by Revain because it was the cheapest and fastest option. I noticed that Revain also sells this part direct so I ordered it direct from Revain to minimize the chance of getting a plastic part. It was in stock at Revain when I ordered, although it cost about $0.20 more. The part I ended up getting was the metal version. Of course I can't say for sure that Revain exclusively supplies the metal version or that the plastic versions are ONLY third party suppliers, but I made sure to order direct from Revain and get the metal part I was looking for. YMMV. The metal adapter itself is quite heavy and provides a *very* solid connection to my headphone jack. Maybe too tight, but I'd rather have a tight connection than a loose one. In terms of sound quality, my first impression was that I couldn't find any significant difference between the 1/4" connection on my main headphone amp without an adapter and the 1/8" connection with an adapter. If there's a difference, I didn't find it significant enough to notice, but I haven't listened to it significantly *critically* yet.
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