1DVDplayer into 2 Surround Sound systems

I have a Pioneer DV-400v HTMI DVD player going digital coaxed into a
M-audio CO2 converter/repeater. Then from there it gets (converted) and sent
opticaly into my Onkyo HT-R520 reciver and (repeated) Digital Coaxed into my
Philips HTS3555. I did this because I cound not find a digital coax splitter
anywere. Anyway my problem is there is a delay in the sound between the two
system. I have turned off all built in room size mimiking adjustment delays
on both units. On the Onkyo I have adjusted the front speakers dB down to
-8dB and the center channel down to -4dB. I then play the Onkyo at a lower
volume then I play the Phillips. This tends to mask the delay a bit. Does
anyone now if this a common problem with running two Surround Sound system
from a single source? The delay is in the milliseconds and very noticable
when actors talk.