I've just collected TD4's piano black 24/96 5500s and am delighted with them.
They sounded lovely through the 818!
They'll become the front pair in my system with the old 18 bit DSPs relegated to rear duties.

Lovely guy to deal with, speakers in perfect condition and a totally stress free transaction (apart from getting them into / out of the car!). Very highly recommended.

Let me know if you decide to offload the HD621 Del!

Cheers,
Marcus.

Cinema: Meridian 271, 3 x DSP640 (behind screen), 4 x DSP320 (in-ceiling), 4 x DSP3100 (surrounds), 2 x AC12 (interface). 2 x Perlisten D12s subs, Lyngdorf MP40 processor. DT 145" 2.35 AT screen. Sony VW870 projector & S-T lens, Lumagen Radiance Pro.
Lounge: Roon, NUC, Kef LS50 Wireless + 2 x REL Gibraltar-2 subs

Meridian owner since 1998