Denon DHT500SD speaker delay settings?

[PeterBlair]

This may be because I'm tired from setting this up all day, but I'm really struggling to get the correct delay settings for the centre and the front L&R speakers

Any tips on the best way to do it? I've measured the position from the speakers to my seated position and tried inputting that but it doesn't work. I just don't seem able to get it to lip-synch.

I'm going from the Denon 500SD straight into my TV via RGB scart (at least until the new HDTV shows up...).

Thanks,

Pete