Dynon Avionics SkyView SE System Installation Manual page 94

SkyView Display Installation and Configuration
audio panel ground are directly connected together, even though they nominally share a
common ground via other aircraft wiring (audio ground is pin 30 on the D37).
If there is more than one display on a SkyView network, you MUST connect all displays' audio
outputs to the same audio panel input to ensure that audio is always heard. Electrically short
the respective left and right outputs together for stereo mode (i.e., left-to-left and right-to-
right) or connect all audio outputs together for mono mode. The same rule applies for audio
grounds.
To minimize the possibility of audio "humming", a 16 AWG wire may optionally be
connected between the ground point for the intercom/audio panel/radio(s) and
SkyView display case(s). To attach the wire to the rear of the SkyView display, a 4-
40 x 3/16" long screw may be screwed into the threaded boss above the USB ports
on the back of the SkyView display.
Audio output volume will be controlled via the interface on a SkyView display, so no external
hardware components are required. The audio output from SkyView has a maximum output of
10V p-p with 50 Ω (50 ohms) of source impedance.
SkyView systems with more than one display normally only output audio alerts from one
display to minimize audio distortion. In a SkyView system that has more than one display and
dual SV-EMS-220s/221s to monitor dual engines, EMS audio alerts are enabled from two
displays. At moments when two displays are outputting EMS audio alerts, there may be minor
"doubling" of audio alerts heard in the audio system.
4-34 SkyView System Installation Guide - Revision AA