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hello Jane, Not familiar with the Cowan X9 only to know it is an HD MP3 so choosing Sennheiser in the first instance as a brand is an excellent choice for quality reproduction. Personally, as a traveller, I've found the PX200-11 to be great sounding and extremely versatile with both adjustable sound and 'fold-away' capability. Compatible? Providing the X9 has a 3.5mm jack then I see no problem. If not bothered about the 'fold-away' feature, then look at other great products from Sennheiser. All the best.
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