I replaced the o-rings with blue latex-free elastic bands as the old ones have deteriorated. I have a brand-new unopened pair of o-rings that will be included.
The headphones were reterminated to 5-pin Stax Pro in early July. Since then, there has been a channel imbalance to the order of 6dB in favor of the left channel. I am uncertain as to whether this is due to the retermination or other issues as I haven't had time to send them in to Drew for a check-up. The imbalance can be remedied through use of analog/digital channel balance controls, such as on most Stax amps.
Six of the eight screws were replaced with screws from a PS1 controller, as the Sennheiser stock ones are notoriously soft and strip very easily.
The HEV70 seems fully operational (including the channel balance control), but gets very hot. I have noticed issues with the unit when playing beyond a day (distortion), so I'd recommend an amplifier with Stax Pro outputs instead. A Stax Pro -> HE60/HEV70 adapter is included so you can use the HE60 or other Stax Pro headphones with the HEV70 if you wish.
The headphones come in the Sennheiser box, but I do not have the original manuals/documentation.
The last time I tested these with the HEV70, there was a slight low-amplitude buzzing in the right channel. I had a similar experience previously that was related to dust, but I am not sure. The left channel played perfectly, as usual.
This set is sold as-is. I would recommend purchasing these only if you are (or have access to) an electrostatic professional, and are prepared to commit any necessary effort to restoring the right channel. I would start by getting the electrical connections checked by Moon-Audio, then sending to Sennheiser from there.
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I will answer serious inquiries.
Edited by 3X0 - 10/21/13 at 6:31am