MOTM

Hi all,
I want to make a Mult Panel. Is the correct way of doing it connecting the Jack's Tip & Ground 
to one another in a chain? Is this how the MOTM Mult is built?

Is it true that I lose a certain amount of dB with each connection? (like 3dB?) is there a way 
around this?

I'll appreciate any insights on this.

Thanks,
Ithai B.