Phil - having looked at the HD621 manual Im not sure I understand why I need
http://www.amazon.co.uk/s/?ie=UTF8&keywo...sl_60awl6vhy6_e
what will it do ?

G98, HD621, 568.25, 558.2, 559, B&W 803Ds, HTM2D, 4xSCM1, ASW850, Pioneer PDLX5090 50" Plasma, Cables by Atlas and Chord