loud and fast clicking on HD

When I play or record HD through my sounds system I get a very fast and loud cicking noise. 

My sound system was previously my audio system and sounds fantastic in normal play mode.

I have a Musical Fedility Dac connecgted from the from The Virgin media box to a NAd amp.  This then powers two schonberg speakers.  I also have a schonberg sub wired in.

can anyone help me understand why this is happening and maybe offer a solution.   T

Thanks in advance