2 amplifiers in a row: Professional Audiophile Switch: receiver, amplifier 99.9% audio pure quality. If you have one set of speakers, and you need a switch between your two audio sources, not to lose any signal or not having problems with an imperfect contacts. When listening to music, hires or hiend, this switch is the ultimate experiment and the perfect invention for you to make yourself an great trick build in to an electronic device: cd player like in our case Denon, or if you have space inside, into the amplifier you use or receiver.