I bought some from Russ Andrews (Less than £20) that are supposed to drop the DBs without turning everything into a muddy mess. Annoyingly, I received and promptly lost them before using them!
They came in a little case and had a connecting cord/lanyard type thing.
If I find them, I'll give them a thorough testing. (Not much better way of testing than wearing them to rehearsal this week).
A/V: Sony KDL-V40A12U & BDP-S350, BT Vision, Onkyo 875, B&W MT-30 7.1, QED A/V cables, R.A power cables
Hi-Fi: Arcam A85 & CD192, B&W 602S3 (& the PV1), Partington stands, Grado SR125, Kimber I/Cs, Rothwells, QED speaker cables, R.A power cables.