I'm not an engineer but I have been using Stax headphones since the 80's, so I'll try to answer your question. There are two types of Stax phones, Pro and Normal. I believe it has to do with the bias. The Normal phones use a 6-pin jack, and the Pro uses a 5-pin one. Many of the Stax headphone amps feature both outputs. I'm sure there must be a 6-pin extension cable out there somewhere. Maybe this post will help you find it. Otherwise, you may have to resort to a WTB (Wanted To Buy) ad. Also, you can try other websites or forums and ask the same question. Best of luck!
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