Depends on the output of the remote turn-on lead from the headunit. I've run as many as 5 devices off some, others wouldn't run more than 2. //content.invisioncic.com/y282845/emoticons/frown.gif.a3531fa0534503350665a1e957861287.gif
You can short out the remote turn-on by trying to run too many off of it... better off using a relay if you have more than 3 devices, IMO.