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What is the treblehead equiv of the K518s? My friend really likes them except for excessive bass and lack of highs...
Sennheiser HD 25 1:II? They are basically in the same ballpark as the K518LE, but more refined (and about 3 times as expensive). Treble is more extended than on the K518. However, they might be too bassy for your friend. The bass amount is almost the same as on the K518, but again, it is slightly more refined.
When comparing HD25 1:II and K518 DJ (same as LE except longer cord) in Japanese electronics stores, I thought that they did not sound too different. The HD25 1:II did sound slightly better to my ears. But as I wrote in an earlier post - they are not 3 times as good as the K518.
Other than that I do not know. Your friend could always go with Grados, but then he'd get an open phone. But perhaps that is no problem?