Yes, I got to understand that after a while - you also don't need a more expensive HDMI cable that can handle 4k video to the HD621.

HD621, G98DH, G68ADV, Bc Acoustiqe ACT A3, 5200C DSP33, NuForce Reference 9 monoblocks, 2x SB3's, Velodyne DD-15 & DD-12 Subwoofers and a Meridian sub.