When I show 16mm using an Eiki in my classroom, I use a guitar amp at the front of the room by the screen. There is a lot of buzzing when the film is not running so I unplug the cord from the projector, but when the knob is at 3:00 - in engaged mode and before the motor is running - there is no buzzing. The sound is good and loud, though not always perfect for that room.

At 15:33 -0800 1/11/15, Dave Tetzlaff wrote:
Connecting a 16mm projector with only a speaker jack to an audio system usually requires TWO things, and the Rolls box offers both:

1. An attenuator circuit to drop the output level from the speaker and match the impedance of the audio system input.

2. An isolation transformer to eliminate ground-loop hum.
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