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I am interested by a RKV-2, which will be used with a Sennheiser HD600. I would like to know if the Impedencer is recommended with the HD600, because a few users have mentioned a noise (hiss) when the RKV is used with HD600 (higher noise if used with lower impedence headphones). I would also like to know the delivery delay of both the RKV-2 and the Impedencer (I live in France). Thanks for your reply, MBL

by AudioValve