Do HDCDs sound terrible on non HDCD players?

Being an analog guy I have but a small collection of CDs and only a handfull are HDCD encoded. All of them sound terrible on my non HDCD player with thick lower midranges, smeared, closed-in textures and a general lack of cohesiveness. For reference my player is the original Rega Planet and the HDCDs are as follows: Olu Dara, In This World, Steve Earle, El Corazon, Garcia and Grisman, Shady Grove, Neil Young, Silver and Gold. Any opininons?