Setup 12V trigger for B&W DS7

Hi Sanjose
The correct setup is a long male to male 3.5 mm cable, connected between receiver Remote OUT and woofer Remote trigger IN.
The trigger connection on the DS7 is certainly not a speaker connection. The industry-standard for remote trigger connection is 12V DC, not AC as in speaker cables.
Do not worry about the mA ratings, it will work.

Thanks for your respond. In DS7, there is a speaker connection for 12V trigger below the main speaker connection, I should connect 3.5 male plug to receiver and other to speaker (2 wire) if I correct. I really am appreciate if you show me by picture. Denon AVR-3805(DC 12V 25mA max) VS. DS7 (spec as 12V trigger current requirement 45mA). Do you think they are ok to connect?

It's a basic mono cable as casouza stated. Go to radioshack. Be careful to go into the correct jack if the unit has in and out or you'll blow a fuse.

Usually, it is a simple 3.5 mm male plug to 3.5 mm male plug cable. Just connect the cables as a daisy chain, from one component to the other.
I suggest that you read the Denon receiver manual, to find out exactly what kind of cable.