How do you sync the output of Zone 1 and Zone 2.


There is about a 2 second delay between Zone 2 and the main zone when playing a CD. I'm using an Arcam universal DVD player and an Onkyo TX-SR875--I am not using the internal amps of the Onkyo. I have the two speakers in Zone 2 bi-amped with four Marantz mono-blocks. The input between the Arcam DVD and the Onkyo is HDMI and also an optical digital and this doesn't make any difference in the audio delay.
dfly
Should work much better using all internal. The other option is using the Marantz (better amps) for both zones with an a/b speaker selector?
I am also using a Sonance DAB 1 for multi room systems. I have three other zones. How does this effect the sync? Only two of the five zones are close enough for me to care about the audio sync'ing.
I'm using a Niles 8 pair impedance matching selector for my house. 5 zones off 1 amp and main zone off the Denon 395 multi-room receiver. I honestly never notice any delays from room to room. This is thousands of feet of runs.