Problem slaving 2 units together!

if6was9

I've got 2 systems, a Sony MHC 2700 with the stock speakers it came with and a marantz sr4200 I just got powering some Bose 301's.

I'm trying to get the 2 systems to play the same source by going into one of the in's, then using that channels out to an input on the other amp. However I'm not really getting any signal from the outs off either amp. Which ever amp I hit with the signal first works, but the other wont.
I've tried going into different channels on both amps and going from the correct outs, eg if I'm using video in I'm using video out to power the other.
I've tried using different phono cables and it made no difference.
I'm getting a small bit of bleed of the signal but its not much and mostly noise.

Any idea what I'm doing wrong? Both of the systems are workintg perfectly on their own. I can't see why the outs aren't working. I've read both manuals and neither contains anything useful about the matter. I also find it unlikely that the line outs are busted on both units which are in perfect working order otherwise.

gsp119

just a guess but if you are taking the audio out from sys 1 trough the aux out - what you are doing is sending the audio to sys 2 - aux in
you can't use the aux out as a slave out -
different amp required - slave amp