Specifications

PS Engineering
PMA8000B Audio Selector Panel and Intercom System
Installation and Operator’s Manual
200-890-0100 Page 3-5 Rev. 13, Dec. 2009
3.7.2.1 Mono headsets in Stereo Installation
The pilot and copilot positions work with stereo or mono headsets. All passenger headsets are connected
in parallel. Therefore, if a monaural headset is plugged in to a P MA8000B Stereo installation, one chan-
nel will be shorted. Although no damage to the unit will occur, all passengers will lose one channel,
unless they switch to the “MONO” mode on the headset. PS Engineering modifies headsets to add stereo
capability, using high-fidelity speakers. Contact factory for details.
3.7.3 Intercom Modes (8)
The “ICS” pushbutton switch on the left side of the panel provides the selection of the three intercom
modes. The description of the intercom mode function is valid only when the unit is not in the "Split"
mode. Then, the pilot and copilot intercom is controlled with the Mute button.
This button cycles through the intercom modes, from top to bottom, then bottom to top as: ISO, ALL
Crew and Crew, ALL, ISO. An LED shows which mode is currently active.
ISO: The pilot is isolated from the intercom and is connected only to the aircraft radio system. He will
hear the aircraft radio reception (and sidetone during radio transmissions). Copilot will hear passengers’
intercom and entertainment, while passengers will hear copilot intercom and entertainment. Neither will
hear aircraft radio receptions or pilot tran smissions. The pilot can hear music if desired. See §3.8.1
ALL: All parties will hear the aircraft radio and intercom. Crew and passeng ers will hear selected enter-
tainment. During any radio or intercom communications, the music volume automatically decreases. The
music volume increases gradually back to the original level after communications have been completed.
CREW: Pilot and copilot are connected on one intercom channel and have exclusive access to the aircraft
radios. They may also listen to Entertainment 1. Passengers can continue to commun icate with themselves
without interrupting the Crew and may listen to entertainment as configu red.
3.8 Music Muting (6)
[Serial Number W04587 and below] There are two SoftMute™ muting circuits. The SoftMute™ circuit
will cut the music almost completely out whenever there is conversation on the radio or intercom. When
that conversation stops, the music returns to the previous level comfortably, over a second or so.
The pilot and copilot have one muting circuit, which is controlled by the front panel button labeled
“Mute.” When this button is pressed, the PMA8000B will be put into a Karaoke mode. The music will
not be muted, ever.
The passenger’s intercom also has a SoftMute™ circuit. It behaves the same way as the crew, such that if
the passengers will hear the radio, or talk on the intercom, the music will mute. If the audio panel is in
CREW mode, then the radio reception will not affect the passenger music.
There is a Karaoke Mode that is activated either by an external switch installed either in the panel or near
where the passengers can reach it, or connected to the AUX button on the PMA8000B.
[Serial Number W04748 and above] The front panel "Mute" button has four modes, and controls the
Mute function for Music 1.
The SoftMute™ circuit will cut the music out whenever there is conversation on the radio, the intercom,
or both, depending on the “Mute” mode selected. When that conversation stops, the music returns to the
previous level comfortably, over a second or so.
The mute mode functions are controlled through sequential pushes of the Mute button, and include an-
nunciations of the mode selected.
Mode 1 - music will mute with either intercom or radio - MUTE button is lit. Voice annunciation is "mute
on."