It is mysterious why this post did not get a response. This is why I did not become a gold member when I signed up.

I own a pair of 1991 Beolab 2500 speakers that I would like to use as computer speakers. Unlike the Beolab 4000/8000 speakers which have a RCA line-in, I am using a 7 pin Din to RCA adapter to transfer the audio signal. The problem that I face is I need a 5V relay to signal on the speakers. I have read about doing this for using an aftermarket subwoofer