It's not a Meridian sub though.
So you need; a phono and C5 lead from the 500 to 565,
A phono and M5 from 3&4 on the 565 to your DSP5K,
A phono from 1&2 to one of your D6Ks and a S5 from the DSP5K,
A phono & S5 from that D6K to the other one,
A phono from the analogue subwoofer output to the Velodyne.

Mark
G68, baby Genelecs, Humax Foxsat, Oppo+Vanity93, Toshiba HD-A35, Pioneer CLD-925 + Meridian 519, various other random bits and bobs
Got a black G08.2 you want to sell?