Wireless Headphones with ... digital inputs.

http://www.sennheiser.com/sennheiser/products.nsf/resources/4035A930FA293B09C12578FD002A2A2C/$File/542538_RS_220_SpSh_08_2011_GB_low.pdf

very interesting. uncompressed CD-rez transmission (do they mean Apt-x over bluetooth?)

but how do I connect and operate these? I need to find a spare analog or digital out (and while I do that I need to make sure all sources are covered). then when I want to use headphones I need to mute whatever the source is palying...

after further reading -

it looks like for every input there is also the same kind of output (analog in and out, optical in and out, coax in and out). So, this probably means that I connect these phones before dac/preamp (one optical in and one analog in) and it will pass the signal through, unless, when I turn the phones on, it will mute the outputs and play into the phones. right?

still, I will have to manually activate downmix to stereo when watching a bluray...

and they are not apt-x but radio 2.4 GHz.

Unique looking cans

Yep, the Sennheiser Rs220 - we first saw them two months ago at The IFA show, as we covered in news at the time:

http://www.whathifi.com/news/ifa-2011-sennheiser-launches-rs-220-high-en...

These £349 bad boys use 802.11 standards to transmit using direct sequence spread spectrum or DSSS basically multiplying the signal over an entire frequency range to try and prevent inference and increase bandwidth. The 'phones are HD600/HD650 quality