I have 2 Stadiums connected and have done it the way Lapierre suggests but when I talked to Sumiko this fall they told me to connect the black wire to the amp ground terminal rather than the ground speaker terminal. I am doing this and it works, the other worked fine also. I am not sure what the difference is. I would check with them, they are very helpful and have a very good set up manual for REL on their web site.