PS Engineering PMA6000M-S User Manual
9800 Martel Road
Lenoir City, TN 37772
www.ps-engineering.com
PMA6000 PMA6000S
PMA6000M PMA6000M-S
PMA6000C PMA6000S-C
PMA6000M-C PMA6000M-S-C
Audio Selector Panel with Intercom System
and
Audio Selector Panel with High-fidelity Stereo Intercom System
Installation and Operation Manual
Flying never sounded so good™
FAA-Approved
TSO C35d
TSO C50c
Document P/N 200-066-0006
Revision 6, March 2005
PS Engineering, Inc. 2005 ©
Copyright Notice
Any reproduction or retransmittal of this publication, or any portion thereof, without the expressed written
permission of PS Engineering, Inc. is strictly prohibited. For further information contact the Publications
Manager at PS Engineering, Inc., 9800 Martel Road, Lenoir City, TN 37772. Phone (865) 988-9800
PMA6000 Series Audio Selector Panel and Intercom System
PS Engineering
Installation Manual
Table of Contents
Section I GENERAL INFORMATION................................................................................................ 1-1
1.1 INTRODUCTION....................................................................................................................1-1
1.2 SCOPE ..................................................................................................................................... 1-1
1.3 EQUIPMENT DESCRIPTION................................................................................................ 1-1
1.4 APPROVAL BASIS - FAA..................................................................................................... 1-2
1.5 SPECIFICATIONS..................................................................................................................1-3
1.6 EQUIPMENT SUPPLIED.......................................................................................................1-4
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED................................................................ 1-4
1.8 LICENSE REQUIREMENTS.................................................................................................. 1-4
Section II -Installation ...........................................................................................................................2-1
2.1 GENERAL INFORMATION .................................................................................................. 2-1
2.1.1 SCOPE................................................................................................................................. 2-1
2.2 Unpacking and Preliminary Inspection.................................................................................... 2-1
2.3 Equipment Installation Procedures........................................................................................... 2-1
2.3.1 Cooling Requirements......................................................................................................... 2-1
2.3.2 Mounting Requirements......................................................................................................2-2
2.3.3 Mounting Rack Installation.................................................................................................2-2
2.3.4 Connector Assembly............................................................................................................ 2-2
2.4 Cable Harness Wiring .............................................................................................................. 2-2
2.4.1 Noise.................................................................................................................................... 2-2
2.4.2 Entertainment Input.............................................................................................................2-3
2.4.3 External Push-to-Talk.......................................................................................................... 2-4
2.4.4 Transmit Interlock ...............................................................................................................2-4
2.4.5 Power................................................................................................................................... 2-4
2.4.6 Existing KMA-24 Installation.............................................................................................2-5
2.4.7 "Swap" Mode....................................................................................................................... 2-5
2.4.8 Backlighting ........................................................................................................................ 2-5
2.4.9 Speaker Loads ..................................................................................................................... 2-5
2.4.10 PA Mute.......................................................................................................................... 2-5
2.4.11 Middle Marker Sense...................................................................................................... 2-5
2.4.12 Unswitched Inputs..........................................................................................................2-5
2.4.13 Intercom..........................................................................................................................2-6
2.4.14 Digital recorder (-IRS units only)................................................................................... 2-6
2.5 Adjustments.............................................................................................................................. 2-6
2.6 Marker Antenna Installation.....................................................................................................2-7
2.7 Communications Antenna Installation Notes........................................................................... 2-7
2.8 Unit Installation........................................................................................................................2-7
2.9 Post Installation Checkout........................................................................................................ 2-8
2.9.1 Required Test Equipment.................................................................................................... 2-8
2.9.2 Power Test........................................................................................................................... 2-8
2.9.3 Operational Checkout, 6000, 6000C 6000S, 6000M, 6000M-S ......................................... 2-8
2.10 Marker Checkout, 6000M, 6000M-C, 6000M-S Only............................................................. 2-9
2.10.1 Operational Checkout, 6000C, 6000M-C and 6000M-S-C............................................ 2-9
2.11 Final Inspection...................................................................................................................... 2-10
Section III OPERATION....................................................................................................................3-1
3.1 SCOPE ..................................................................................................................................... 3-1
3.2 Audio Selector (All models).....................................................................................................3-1
3.2.1 Speaker Amplifier................................................................................................................ 3-1
3.3 Mic Selector Switch (Fail Safe Operation) .............................................................................. 3-2
3.3.1 Mic Selector Switch, Com 3 (6000C, 6000MC 6000SC and 6000M SC only).............................................. 3-2
3.3.2 Swap Mode (Switch from Com 1 to Com 2 remotely)........................................................ 3-2
3.4 Split Mode (6000, 6000M, 6000S, 6000MS)........................................................................... 3-2
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PMA6000 Series Audio Selector Panel and Intercom System
PS Engineering
Installation Manual
3.5 Split Mode (6000C, 6000MC, 6000SC, 6000MSC) ................................................................3-3
3.6 Intercom ................................................................................................................................... 3-3
3.6.1 Volume Control, Monaural (6000, 6000M, 6000C, 6000MC)............................................ 3-3
3.6.2 Volume Control, Stereo, (6000S, 6000MS, 6000SC, 6000MSC)....................................... 3-3
3.6.3 Adjusting the VOX-Squelch control, Monaural (6000, 6000M, 6000MC) ........................ 3-3
3.6.4 Adjusting the VOX- Squelch control, Stereo (6000S, 6000MS, 6000SC 6000MSC)........3-4
3.6.5 Intercom Modes (All versions)............................................................................................ 3-4
3.6.6 Push to talk intercom mode.................................................................................................3-5
3.6.7 Internal Recorder System (Option 1, only).......................................................................... 3-5
3.7 Marker Beacon (PMA6000M, PMA6000M-S, PMA6000M-C, PMA6000M-S-C)................ 3-6
3.7.1 Middle Marker Sense........................................................................................................... 3-6
3.7.2 External Marker Lights (6000, 6000S, 6000C, 6000SC)....................................................3-6
3.7.3 Receiver Sensitivity............................................................................................................. 3-6
Section IV- Warranty and Service...................................................................................................... 4-1
4.1 Warranty................................................................................................................................... 4-1
4.2 Factory Service......................................................................................................................... 4-1
Appendix A External PTT Hook Up.....................................................................................................A
Appendix B- Installation Drawing.........................................................................................................B
Appendix D Top Connector wiring (Mono), PMA6000, PMA6000C, PMA6000M, PMA6000M-CD
Appendix E Top Connector wiring, (Stereo) PMA6000S, PMA6000MS, PMA6000MS-C...............E
Appendix F -Instructions for Continuing Airworthiness and FAA Form 337 .................................. F
Appendix G RTCA DO160B Environmental Qualification Form.....................................................G
Table of Figures
Figure 1-1 PMA6000 Mono units...............................................................................................................1-2
Figure 1-2 PMA6000S Stereo units ............................................................................................................ 1-2
Figure 1-3 PMA6000SC Stereo w/Com 3................................................................................................... 1-2
Figure 2-1 Adjustments............................................................................................................................... 2-7
Figure 3-1 Audio Selector........................................................................................................................... 3-1
Figure 3-2 Mic Selector............................................................................................................................... 3-2
Figure 3-3 Volume Controls Mono............................................................................................................. 3-3
Figure 3-4 Volume Control Stereo.............................................................................................................. 3-3
Tables
Table 3-1 Intercom Modes..........................................................................................................................3-5
Revision History
Rev By Date Change
2 GLP May 1999 Rewrite to add all models
3 GLP April 2000 Clarified headphone jack phase
4 GLP November 2000 Corrected dimension in Appendix B, added keying notes
5 GLP November 2002 Changed warranty to 1-year
6 GLP March 2005 Added list of required test equipment
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PMA6000 Series Audio Selector Panel and Intercom System
PS Engineering
Installation Manual
Section I
GENERAL INFORMATION
1.1 INTRODUCTION
The PMA6000 family of Audio Selector Panels are revolutionary products. Never before has there been so
much capability and utility in such a compact package. These units are designed fo r ease of use and installation, as well as to facilitate cockpit resource management and improve passenger entertainment.
Before installing and/or using this product, please read this manual completely. This will ensure that you
will take full advantage of all the advanced features.
1.2 SCOPE
This manual provides detailed installation and operation instructions for the PS Engineering PMA6000series of Audio Selector Panel/Intercom Systems. This includes the following units:
Model Description Part Number
PMA6000 Audio Selector Panel 6000
PMA6000S Stereo Audio Selector Panel 6000S
PMA6000M Audio Selector Panel with Marker Receiver 6000M
PMA6000M-S Stereo Audio Panel with Marker 6000MS
PMA6000C Audio Panel with Com 3 6000C
PMA6000S-C Stereo Audio Selector Panel with Com 3 6000SC
PMA6000M-C Audio Panel w/MKR and Com 3 6000MC
PMA6000M-S-C Stereo Audio Panel w/MKR and Com 3 6000MSC
-IRS Digital Recorder added to any PMA6000 -IRS
Option 2 No silver trim around the bezel Opt. 2
Where the functions are identical to all units, it will be referred to herein as a PMA6000. Otherwise, the
applicable units will be specified.
1.3 EQUIPMENT DESCRIPTION
The PMA6000-series is a state of the art audio isolation amplifier and audio selector that contains a voice
activated (VOX) intercom system. It can switch up to three transceivers (Com 1, Com 2 and TEL) and six
receivers (Nav 1, Nav 2, ADF, DME, MKR and AUX). In addition, there are two unswitched inputs, for
telephone ringer and altimeter warning. Push buttons select the receiver audio source provided to the headphones. A SPR button allows the user to listen to the receiver(s) selected on the cabin speaker. Except for
the unswitched inputs, all speaker audio is muted during transmit. A rotary switch selects one of the three
transceivers for the pilot and copilot position in transmit. In "Split Mode" the PMA6000 has the ability to
allow the pilot and copilot to operate different transmitters independently and simultaneously.
A fail-safe mode connects the pilot headphone and microphone to COM 1 if power is removed for any
reason, or if the Mic Selector switch is turned to the Off position.
A six-station voice activated (VOX) intercom is included in the PMA6000. pilot isolate and crew modes,
two mono (or stereo depending on unit) music inputs with "Soft Mute," and a 2-color Light Emitting Diode
for power and transmit indications. Intercom control is through front panel mounted knobs. Monaural
units have dual concentric knobs that control pilot volume and intercom squelch, and copilot/passenger
volume and squelch. In the stereo versions, there is a single volume and squelch control for all on board.
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PS Engineering
Installation Manual
An optional 3-light Marker Beacon receiver is integral to the PMA6000M, PMA6000MS PMA6000MC
and PMA6000M-S-C. This provides the necessary Marker Beacon light and audio indications necessary
for an Instrument Landing System (ILS) approach.
Figure 1-1 PMA6000 Mono with marker
Figure 1-2 PMA6000SC Stereo, Com 3, no trim ring
Figure 1-3 PMA6000M-S Stereo units
Figure 1-4 PMA6000M-S-C Stereo w/Com 3 and no trim ring
1.4 APPROVAL BASIS - FAA
TSO Approval.
The PMA6000, PMA6000S, PMA6000C and PMA6000S-C Audio Selector Panels are FAA approved
under TSO C50c (Audio Amplifiers).
The PMA6000M, PMA6000M-S, PMA6000M-C, and PMA6000M-S-C are FAA approved under TSO
C50c and TSO C35d (Marker Beacon Receivers).
All systems comply with RTCA DO-143, DO-160b and DO-170.
Operation is subject to the following conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired
operation.
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PMA6000 Series Audio Selector Panel and Intercom System
PS Engineering
Installation Manual
1.5 SPECIFICATIONS
GENERAL SPECIFICATION CHARACTERISTIC TSO COMPLIANCE:
Marker Beacon: C35d, Class A
Audio Selector/Intercom: C50c, Class A
APPLICABLE DOCUMENTS: RTCA DO-160b, RTCA DO-170 and RTCA DO-143
ENVIRONMENTAL Qualifications: A1D1/CAMXXXXXXXBBBBAAX
Temperature Range: Operating: -20°C to +55°C Storage: -40°C to +85°C
Altitude: Up to 50,000 feet in an non-pressurized area of the cockpit.
DIMENSIONS: Height: 1.3 in. (3.3 cm) Width: 6.25 in. (16.9 cm) Depth: 6.8 in. (17.3 cm)
WEIGHT (With Rack & Connectors) : 1.5 Lb. (0.68 kg.)
POWER REQUIREMENTS (Including Internal Lighting):
Voltage: 13.75 or 27.5 VDC*
Maximum Current: 1 Amp (Externally protected by a 2 Amp circuit breaker.)
Typical operating current: speaker off: 350 mA
speaker on: 600 mA
NOTICE: To reduce the amount of heat dissipated in the audio selector panel, when used in a 28
Volt aircraft, the 15 Ω, 15 Watt dropping resistor (P/N 701-015-1501) must be installed in series
with the power input.
Audio selector panel input impedance: 510 Ω
Input Isolation: -70 dB (min.)
Speaker Muting: -60 dB (min.)
Speaker Output (into 4 Ω): 3 Watts (min.) with no clipping
Switched Receiver Inputs: 8
(Com 1, Com 2, Nav 1, Nav 2, ADF, DME, MKR, AUX)
Unswitched Inputs: 2
(TEL Ringer, Altimeter DH)
Transmitter Selections: 5
(Com 1, Com 2, Com1/2, Com2/1, TEL/Com1)
on PMA6000, PMA6000S, PMA6000M, PMA6000M-S
(Com 1, Com 2, Com1/2, Com2/1, Com 3)
on PMA6000C, PMA6000S-C, PMA6000M-C, PMA6000M-S-C
Speaker Impedance: 4 Ω
Headphone Impedance: 150 - 1000 Ω
Headphone Output: 45 mW each headset with no clipping
Microphone Impedance: 150 - 600 Ω
Intercom Positions: 6 places
Music Inputs: 2
Music Muting: >50 dB "Soft Mute" when Com or intercom active.
Distortion: <1% THD @ 45 mW into 150Ω
Mic Freq. Response, ±3 dB: 350 Hz - 6000 Hz
Music Freq. Response, ±3 dB: 200 Hz - 15 kHz
MARKER BEACON RECEIVER: (PMA6000M, PMA6000M-S, PMA6000M-C, PMA6000M-S-C
Only)
Frequency: 75 MHz Crystal Controlled
Sensitivity:
Low: 450 µVolts (Hard)
Factory adjusted to 1400µV (Soft)
High: 160 µVolts (Hard)
Factory adjusted to 150µV (Soft)
Selectivity: -6 dB at 110 kHz -40 dB at 120 kHz
External Lamp Output: 9.0 (+/- 0.5) VDC Positive when active, max. current 125 mA
MM Sense: Active high (4.7 VDC +/- 0.5V) during Middle Marker acqui-
sition, for autopilot use.
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PMA6000 Series Audio Selector Panel and Intercom System
1.6 EQUIPMENT SUPPLIED
A. 1 ea. of the following units:
Model Part Number
PMA6000 6000
PMA6000S 6000S
PMA6000M 6000M
PMA6000M-S 6000MS
PMA6000C 6000C
PMA6000S-C 6000SC
PMA6000M-C 6000MC
PMA6000M-S-C 6000MSC
Tray 430-004-0001
B. PMA6000 Installation Kit:
PS Engineering
Installation Manual
Part Number Description Quantity
Stereo
120-425-4402 Top Connector, Stereo (key 4/5) 1 x
120-425-4401 Top Connector, Mono (key 2/3) x 1
120-425-4400 Bottom Connector (key 7/8) 1 1
425-001-0001 Gold Plated Crimp Pins 75 75
701-015-0015 15 Watt Dropping Resistor
1 1
(Recommended for 28 Volt Systems)
200-066-0003 Operator's and Installation Manual 1 1
1.7 EQUIPMENT REQUIRED BUT NOT SUPPLIED
A. Speaker, 4 Ω
B. Headphones, 150 Ω stereo (6000S) or mono (6000), up to 6 as required
C. Microphones, up to 6 as required
D. Marker Antenna (75 MHz, VSWR <1:1.5, and appropriate for the airspeed)
E. Interconnect Wiring
F. Headphone Jacks (As Required)
G. Microphone Jacks (As Required)
H. Circuit Breaker: 1 ea. 2 amp.
1.8 LICENSE REQUIREMENTS
None
Quantity
Mono
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PMA6000 Series Audio Selector Panel and Intercom System
PS Engineering
Installation Manual
Section II -Installation
2.1 GENERAL INFORMATION
2.1.1 SCOPE
This section provides detailed installation and interconnect instructions for the PS Engineering PMA6000Series Audio Selector Panel/Intercom System and PMA6000M-Series Audio Selector Panel/Intercom System with internal Marker Beacon.
With the exception of the internal marker beacon receiver, the PMA6000, PMA6000S, PMA6000C and
PMA6000SC are identical to the PMA6000M, PMA6000M-S, PMA6000M-C, PMA6000M-S-C. All units
will be identified hereafter as the PMA6000, where the information applies to all.
Please read this manual carefully before beginning any installation to prevent damage and post installation
problems. Installation of this equipment requires special tools and knowledge. The equipment must be
installed by an appropriately rated Certified Aircraft Repair Station, in accordance with applicable regulations.
NOTE: The PMA6000-Series-S requires specialized knowledge and tools for an effective installation. An
appropriately rated Certified Aircraft Repair Station must install this equipment in accordance with applicable regulations. PS Engineering, Incorporated warranty is not valid unless the equipment is installed by
an authorized PS Engineering, Incorporated dealer. Failure to follow any of the installation instructio ns, or
installation by a non-certified individual or agency will void the warranty, and may result in an unairwor-
thy installation.
2.2 Unpacking and Preliminary Inspection
Use care when unpacking the equipment. Inspect the units and parts supplied for visible signs of shipping
damage. Examine the unit for loose or broken buttons, bent knobs, etc. Verify the correct quantity of components supplied with the list in Section 1.6 (B). If any claim is to be made, save the shipping material and
contact the freight carrier. Do NOT return units damaged in shipping to PS Engineering. If the unit or
accessories shows any sign of external shipping damage, contact PS Engineering to arrange for a replacement. Under no circumstances attempt to install a damaged unit in an aircraft. Equipment returned to PS
Engineering for any other reason should be shipped in the original PS Engineering packaging, or other
UPS approved packaging.
2.3 Equipment Installation Procedures
2.3.1 Cooling Requirements
Forced air cooling of the PMA6000 is not required. However the unit should be kept away from heat producing sources (i.e. defrost or heater ducts, dropping resistors, heat producing avionics) without adequate
cooling air provided.
NOTICE: To reduce the amount of heat dissipated in the audio selector panel, when used in a 28
Volt aircraft, it is required that the 15 Ω, 15 Watt dropping resistor (p/n 701-015-1501) be in-
stalled in series with the power input.
If the PMA6000/M-S is installed in a 27.5 VDC aircraft system, a 15 Ω, 15 Watt dropping resistor (p/n
701-015-1501) should be installed. Failure to do so will generate unnecessary heat inside the unit and may
void PS Engineering's warranty.
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PS Engineering
Installation Manual
2.3.2 Mounting Requirements
The PMA6000 must be rigidly mounted to the instrument panel of the aircraft structure and within view
and reach of the pilot position(s). Installation must comply with FAA Advisory Circular AC 43.13-2A. The
unit may be mounted in any area where adequate clearance for the unit and associated wiring bundle exist.
NOTE: The mounting hole configuration for the PMA6000 is identical to the KMA-24 Audio Se-
lector Panel. See Appendix B
2.3.3 Mounting Rack Installation
2.3.3.1 Monaural (6000, 6000M, 6000C, 6000MC)
Remove the unit from the mounting tray by first removing the copilot volume and squelch knobs (the
knobs are press-fit on the shaft) and then unscrew the 3/32-inch hex-head screw that is to the right of the
copilot control knob shaft. Carefully slide the unit free of the tray. Set the unit aside in a safe location until
needed. Install the tray using six FHP 6-32 x ½-inch screws. The audio selector panel must be supported at
front and rear of the mounting tray.
2.3.3.2 Stereo (6000S, 6000MS, 6000SC, 6000MSC)
Remove the unit from the mounting tray by unscrewing the 3/32" hex-head screw that is to the right of the
squelch knob shaft. It is not necessary to remove the squelch knob. Carefully slide the unit free of the tray.
Set the unit aside in a safe location until needed. Install the tray using six FHP 6-32 x ½" screws. The audio selector panel must be supported at front and rear of the mounting tray.
2.3.4 Connector Assembly
The unit connectors mate directly with the circuit boards in the PMA6000. The connectors are a Molex
crimp-type, and require the use of a Molex hand crimp tool, EDP P/N 11-01-0203, CR6115B (or equiv.).
The connector is mounted to the unit tray with #4-40 screws, from the inside of the tray. Ensure that proper
strain relief and chafing precautions are made during wiring and installation.
2.4 Cable Harness Wiring
Referring to appropriate Appendix C, D, E and F, assemble a wiring harness as required for the installation. All wires must be MIL-SPEC in accordance with current regulations. Two- and three-conductor with
shield wire must be used where indicated, and be MIL-C-27500 or equivalent specification. Proper stripping, shielding and soldering technique must be used at all times. It is imperative that correct wire be used.
Refer to FAA Advisory Circular 43.13-2A for more information. Failure to use correct techniques may
result in improper operation, electrical noise or unit failure. Damage caused by improper in stallation will
void the PS Engineering warranty.
2.4.1 Noise
Due to the variety and the high power of radio equipment often found in today's general aviation aircraft,
there is a potential for both radiated and conducted noise interference.
The PMA6000 power supply is specifically designed to reduce conducted electrical noise on the aircraft
power bus by at least 50dB. Although this is a large amount of attenuation, it may not eliminate all noise,
particularly if the amplitude of noise is very high. There must be at least 13.0 VDC present at the bottom
connector, pin 20, of the PMA6000 for the power supply to work in its designed regulation. Otherwise, it
cannot adequately attenuate power line noise. Shielding can reduce or prevent radiated noise (i.e., beacon,
electric gyros, switching power supplies, etc.) However, installation combinations can occur where inter-
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PMA6000 Series Audio Selector Panel and Intercom System
PS Engineering
Installation Manual
ference is possible. The PMA6000s were designed in a RFI hardened chassis and have internal Electromagnetic Interference (EMI) filters on all inputs and outputs.
Ground loop noise occurs when there are two or more ground paths for the same signal (i.e., airframe and
ground return wire). Large cyclic loads such as strobes, inverters, etc., can inject noise signals onto the
airframe that are detected by the audio system. Follow the wiring diagram very carefully to help ensure a
minimum of ground loop potential. Use only Mil Spec shielded wires (MIL-C-275000, or better). Under no
circumstances combine a microphone and headphone wiring into the same shielded bundle. Always use a
2- or 3-conductor, shield wire as shown on the installation wiring diagram.
Radiated signals can be a factor when low level microphone signals are "bundled" with current carrying
power wires. Keep these cables physically separated. It is very important that you use insu lated washers to
isolate the ground return path from the airframe to all headphone and microphone jacks.
Adding a high-performance audio control system, particularly in conjunction with active noise canceling
headsets, cannot improve on older avionics that were designed for cabin-speaker use. PS Engineering
makes no claim that the audio panel will provide a noise-free audio quality under all installation conditions,
particularly with older avionics.
2.4.2 Entertainment Input
2.4.2.1 Monaural (6000, 6000M, 6000C, 6000MC)
Two entertainment devices (CD player, cassette player, etc.) can be connected to the unit. Install two 1/8inch stereo jacks in a convenient location so that the pilot can plug in the entertainment devices into the
system.
For a stereo input, we recommend tying the left and right channels (tip and ring) together, so both stereo
channels are provided to the monaural audio panel, and the audio amplitude available to the audio panel is
increased. Audio signal at the entertainment input must be a minimum of 500 mV P-P for optimum music
performance. We have noticed that the portable devices using 4 batteries seem to work better than the 2cell types. Also we have found that some cigarette-lighter adapters introduce noise into the system due to
the dropping power supply.
NOTE: The Soft Mute must
be enabled in the 6000, 6000M, 6000C, 6000MC
either by connecting top connector pins N and 12 together in the harness, or
through an external Soft Mute Enable switch.
2.4.2.2 Stereo (6000S, 6000MS, 6000SC, 6000MSC)
Two stereo entertainment devices (CD player, cassette player, etc.) can be connected to the unit. Install two
1/8-inch stereo jacks in a convenient location so that the pilot can plug in the entertainment devices into the
system. The audio signal at the entertainment input must be a minimum of 500 mV P-P per channel for
optimum music performance. We have noticed that the portable devices using 4 batteries seem to work
better than the 2-cell types. Also we have found that some cigarette-lighter adapters introduce noise into
the system due to the dropping power supply.
2.4.2.3 Soft Mute
The PMA6000-system incorporates a "Soft Mute" system. This will mute the entertainment devices during
ICS or radio traffic. While in the ALL or ISO modes, entertainment #1 is heard by everyone (except by the
pilot in ISO mode). While in the CREW mode, pilot and copilot will hear entertainment #1 while the passengers will hear entertainment #2.
Entertainment inputs #1 and #2 can be paralleled so a single entertainment source can serve both the
passengers and the crew in "crew" mode. It is suggested however, that a switch (DPDT) be installed
between the single entertainment device and entertainment input #1. This will allow the pilot and copilot to
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