Some questions I hope the more experienced could help me with. I received a set of used HE60 +HEV70. I'm in the US and they shipped from abroad. At first the sound seemed clear enough and at normal levels, but then I started to notice some distortion when the treble spiked. Gradually the sibilance increased and the volume seemed to diminish.
I tried reconfiguring with different cables and components but the same results. I plugged other electrostats into the same sources using the same cables and they are fine.
But the HE60 + HEV70 are severely distorted and play at a very low volume. At the moment I can reduce the source and HEV70 to about 75% volume levels and the distortion seems to disappear. But at this level I cannot tell if the distortion is gone or I simply cannot hear it. In any case, it's so quiet that it defeats the purpose.
At any rate I would imagine that the unit should play louder at 75% volume.
The previous owner did not have this issue. I've been in contact with Sennheiser about servicing this, but wanted to see if anyone here has had a similar experience and maybe some suggestions.
I don't have an adapter, or I would try the HE60s in STAX amps, since I know the HEV70s have a history of breaking down.
Any suggestions would be greatly appreciated. With thanks in advance.