Reply to Anyone else noticed low input levels on S4 when linking 2 S4's.

Hey guys,

I have a little conundrum that I have been experiencing for a while.
A buddy and I pair our S4's from time to time via RCA cables.
We send out from his master to my input C or D and set my Traktor to live deck.
The downside is his output is so low, we try turning up the gain but it doesnt solve it enough.
His main out is set to about -5db to stop clipping and headroom is off.
Is it just the S4's out is pretty low? My deck always seems so much louder.

Any ideas?