I am looking for advice on the best way to connect some devices to my home amp, Sherbourn LDS 12\/900. Both devies are in my backyard and the amp is in my basement 50ft away from one device, an Amazon echo device, and 150ft aaway from the other, a movie projector. I am currently using a 3.5mm cable to the echo and then an extension cable to the projector and hte sound is ok for the echo but not so great fro the projector, there is a hum and the volume is pretty poor. Is there a better cable I could use or is bluetooth the only real option? Moving the amp would only get me 25ft.