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Has anyone tried using one of the Koss 60ohm lineup with Fixup's 80ohm resistor cable (primarily designed for the Ety ER4P's)?

His website cites this as a good mod for the Koss' too - a way to tighten up the bass. Anyone try this?

My thought is that it may be a worthwhile investment as I could use it now with my Koss', and also with some Ety's if I ever get a pair.

Also, for those that already have this cable, what version did you get (5", 9", standard, RS Premium Gold, etc.)? Differences other than the obvious?