Bose A20 Owner's Manual
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Bose A20 Owner's Manual

Aviation headset
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Bose
A20
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Aviation Headset
Owner's Guide

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Summary of Contents for Bose A20

  • Page 1 Bose ® ® Aviation Headset Owner’s Guide...

  • Page 2: Important Safety Information

    Batteries may cause a fire or chemical burn if mishandled. Do not recharge, disassemble, heat, or incinerate batteries. Dispose of used batteries properly, following any local regulations. The headset will not operate properly if used with any battery source other than the Bose A20 Aviation Headset control module.
  • Page 3 We suggest you keep your receipt with this owner’s guide. The Bluetooth word mark and logos are registered trademarks owned by Bluetooth SIG, Inc., and any such use by Bose Corporation is under license. All ® other marks are property of Bose Corporation.

  • Page 4: Table Of Contents

    Contents Introduction ..................6 About your Bose Aviation Headset ................6 ® ® Our commitment to you ......................6 What’ s included ........................6 Components ..........................7 Control module variations .................... 8 Power and cable variations................... 9 Preparing the headset for use ............10 The microphone assembly ....................10...
  • Page 5 Contents Recovering a lost connection ................23 Disconnecting a Bluetooth device ..............23 ® Clearing the headset pairing list .................23 Controlling Bluetooth volume ................23 ® Secondary audio modes ......................24 Secondary Audio Mode selector ................24 Managing multiple secondary sources ..............25 Setting the Priority (BT-AUX) switch ..............25 Headset care and maintenance ............

  • Page 6: Introduction

    When you purchase any product from Bose, we encourage you to compare it, as we do, to competitive products. We believe that this process will enhance your appreciation of the product you select. With best wishes from all of us at Bose for many years of enjoyment.

  • Page 7: Components

    Introduction Components Headset Carrying case Clothing clip 2 AA alkaline batteries* Control module See “Control module variations” on page 8 for options 3.5 mm AUX audio cable Second clothing clip Cable connector (varies) Note: Cable connector types will vary based on model of headset. See “Power and cable variations”...

  • Page 8: Control Module Variations

    Introduction Control module variations If you purchased the Bluetooth version of the headset, you received the Bluetooth control module. If not, you received the conventional control module. Bluetooth control module Conventional control module ® Left/Right Intercom Volume controls Power indicator Power button Bluetooth indicator...

  • Page 9: Power And Cable Variations

    5-pin XLR U384 8-pin * An adapter is available from Bose to convert a 6-pin connector to a dual G/A or U174 plug for additional connection flexibility. Note: Many different combinations of control module, microphone, connector and cable types are available. Contact Bose Technical Support for more i nformation.

  • Page 10: Preparing The Headset For Use

    Preparing the Headset for Use The microphone assembly Your headset may be shipped with the microphone assembly (boom microphone and cable) attached to the left earcup. If you prefer, you can switch it to the right earcup. If your headset is shipped with the microphone assembly packed separately, you can attach it to either earcup.

  • Page 11: The Battery Compartment

    Preparing the Headset for Use The battery compartment The headset is shipped with factory-set operation defaults. If you want to alter these defaults, you can change the operation switches located inside the control module battery compartment. Opening the battery compartment Press down firmly on the finger indent and slide the cover down.

  • Page 12: Auto On

    Preparing the Headset for Use This table shows possible positions, default setting, and purpose for each operation switch. Operation Switch Purpose PRIORITY Establishes priority between two secondary audio sources. Select BT to give the Bluetooth (wireless) (Available for connection higher priority. Select AUX to give the wired Bluetooth ®...

  • Page 13: Inserting And Replacing The Batteries

    See “Mounting the aircraft panel connector” on page 35. Note: An adapter is available from Bose to convert a 6-pin connector to a dual G/A or U174 plug for additional connection flexibility for users who fly multiple aircraft and require other connector types.

  • Page 14: Using The Dual General Aviation Plugs

    Preparing the Headset for Use To disconnect the headset Pull back on the sleeve near the end of the 6-pin plug. Gently continue pulling back to remove the plug from the connector. Caution: Do not pull the connector out without first pulling back the sleeve. Forcing the connector out will damage the cable and/or the aircraft instrument panel.

  • Page 15: Using The Headset

    ® pressure change. If the problem continues when the sound level returns to normal, see “Noise reduction” on page 30. If the problem persists, contact Bose Techni- cal Support. Conditions related to fit A low rumbling sound or frequent, brief losses of Acoustic Noise Cancelling noise reduction may indicate an improper fit or blocked earcup ports.

  • Page 16: Microphone Placement

    Using the Headset Microphone placement Microphone placement is important for clear communications. With the headset on your head, make these adjustments: Grasp the boom with your fingers and move the microphone up or down so it is level with your mouth. Pull the microphone in toward your lips.

  • Page 17: Using The Control Module

    Using the Headset Using the control module If you purchased the Bluetooth version of the headset, you received the Bluetooth ® control module. If not, you received the conventional control module. Bluetooth control module Conventional control module ® Left/Right Intercom Volume controls Power indicator Power button Bluetooth...

  • Page 18: Power Indicator

    Using the Headset Power indicator New alkaline AA batteries will generally supply at least 45 hours of power for the headset. Battery life varies with the ambient noise level of the aircraft, temperature, ear cushion condition, use of the Bluetooth feature, and age of the batteries.

  • Page 19: Primary And Secondary Audio Sources

    Using the Headset Primary and secondary audio sources The aircraft intercom system (ICS) is always the headset’s primary audio source. When the headset is plugged in to the aircraft, intercom signals will always be heard and cannot be muted by the headset. In addition to the primary source (intercom), the headset can connect to secondary audio sources.

  • Page 20: Using The Headset With A Bluetooth Device

    Locate the Bluetooth menu on your device and make sure the Bluetooth feature is ON. Select Bose A20 from the Bluetooth device list. Bose A20 The Bluetooth indicator flashes blue while the devices are pairing, and a tone indicates successful connection.

  • Page 21: Pairing Another Device

    Locate the Bluetooth menu on your device and make sure the Bluetooth feature is ON. Select Bose A20 from the Bluetooth device list. The Bluetooth indicator flashes blue while the devices are pairing. Note: The headset will automatically exit pairing mode after five minutes of inactivity.

  • Page 22: Making And Answering Calls

    Using the Headset Making and answering calls Call activity What to do To make a call Dial from your connected phone. The call will automatically transfer to the headset. To activate voice control When there are no active or incoming calls, briefly press (if available) To answer a call Briefly press...

  • Page 23: Reconnecting To A Previously Connected Device

    Using the Headset Reconnecting to a previously connected device Each time you turn on the Bluetooth feature, the headset will attempt to reconnect with the two most recently connected Bluetooth devices. ® Turn the headset on. Make sure the Bluetooth indicator is flashing blue. If not, press The indicator flashes blue.

  • Page 24: Secondary Audio Modes

    Using the Headset Secondary audio modes If you have connected one or more secondary audio sources to the headset, you must decide how you want to hear those secondary sources. To select how you will hear your secondary audio sources, use the Secondary Audio Mode selector on the control module.

  • Page 25: Managing Multiple Secondary Sources

    Using the Headset Managing multiple secondary sources The headset can connect one AUX (wired) source and up to two Bluetooth ® ( wireless) sources at a time. If you are likely to receive important information from a particular secondary source (such as a GPS or a warning system), you can assign priority to that source.

  • Page 26: Headset Care And Maintenance

    If cleaning or replacement of these items is needed, follow the recommendations on the following pages. All other care and maintenance, in and out of the warranty period, must be performed by Bose or an authorized repair facility.

  • Page 27: Microphone Windscreen

    Allow the cushion to air dry, then reattach. Replacing parts Through normal use, parts like windscreens and ear cushions may require periodic replacement. Replacement parts can be ordered directly from Bose Corporation. Please refer to “Contact information” on page 41. Microphone windscreen replacement Gently slide or roll the windscreen off the microphone.

  • Page 28: Ear Cushion Replacement

    Headset Care and Maintenance Ear cushion replacement As a general rule, ear cushions should be replaced every six months or every 350 hours of use, depending on how often you fly. You may have to replace them more often, if you: •...

  • Page 29: Headband Cushion Replacement

    The headband cushion is designed to give the maximum level of comfort to your headset. Bose recommends that you replace the cushion after regular care and maintenance fails to restore the wool pile to its original size and shape. To replace the cushion: On a protected surface, turn the headset upside down.

  • Page 30: Troubleshooting

    Look for the problem in the left column of the table, then follow the “What to do” instructions in the right column. If the problem persists, contact Bose using the contact information on page 41 of this guide for assistance.
  • Page 31 Troubleshooting Problem What to do Low volume • On the control module, make sure the volume controls are not set of incoming too low. See “Intercom volume controls” on page 18. communications • On the intercom/radio, make sure the volume controls are not set too low.
  • Page 32 • If the squealing or whistling sound persists, turn off the power switch and contact Bose for service as soon as possible. Low rumbling • Adjust the earcup fit to create a better seal on your head. The...
  • Page 33 Troubleshooting AUX audio source Problem What to do No audio from • On the AUX source, turn the volume up. AUX source • Make sure the 3.5 mm AUX audio cable is firmly connected to the control module and the AUX source. •...
  • Page 34 • On the control module, make sure the Secondary Audio Mode selector is in the MUTE or MIX position. • On your device, make sure the Bluetooth feature is on. • On your device, delete BOSE A20 from the Bluetooth device list. Then try pairing again. Auto on...

  • Page 35: Installation

    Mounting the aircraft panel connector The aircraft panel connector is part of the optional 6-pin wiring harness assembly. Visit www.Bose.com or www.global.Bose.com for information or purchase. Warning: The aircraft panel connector must be mounted by a technician who is qualified to perform this type of avionics installation for the aircraft you are using.

  • Page 36: Technical Information

    Caution: Do not use excessive force or bend the installed connector. This may damage or break internal solder joints. Note: The aircraft panel connector cannot be installed in an audio system using transformer-coupled audio outputs. Contact Bose Technical Support, using the contact information on page 39 for details. Mono connection diagram...

  • Page 37: Helicopter (U174) Connection Diagram

    Technical Information Helicopter (U174) connection diagram WHT/BLU MIC LO MIC HI COMM R COMM L 10-32 V+IN 1/2A V DC Existing single 4- prong jack Existing wiring to Barrel helicopter intercom/ (audio gnd) audio panel Note: Barrel ground (gnd) refers to aircraft grounds. Details on making the connections The pinouts for the optional installed connector are detailed in the table below: Pin number...
  • Page 38 Technical Information Headphone Damage could occur to avionics equipment that is intended for use only with 600 Ohm headsets. If in doubt, consult the avionics equipment manufacturer. Impedance Monaural mode: 160 Ohms ON and OF Stereo mode: 320 Ohms ON and OFF Frequency response 15 Hz to 15 kHz Sensitivity: 92 dB SPL typical, measured at 1 mw,...

  • Page 39: Faa Technical Standards Order

    Technical Information FAA Technical Standards Order The Bose Aviation Headset that are approved to TSO and ETSO C139 are ® ® appropriately marked. The product interface, cables, and microphones have been designed to function in or withstand exposure to the following environmental...

  • Page 40: Warranty And Service Information

    ® located on the underside of the headband and underneath the headband cushion. Reference this serial number when you register your product or contact Bose for technical support. Be sure to properly reseat the headband cushion by pressing down firmly. For more information on replacing the headband cushion, see Refer to “Headband cushion...

  • Page 41: Contact Information

    Service and Warranty Information Contact information Contact Bose for: • Spare parts and accessories • Technical advice • Installation information • Warranty and repair information In North America: Bose Technical Support 145 Pennsylvania Avenue Framingham, MA 01701-9168 USA TEL: 1-800-233-4416 (US); 508-879-7330, ext. 62006 (outside U.S.) FAX: 1-508-766-5997 E-MAIL: aviationheadsetsupport@Bose.com...
  • Page 44 ©2015 Bose Corporation, The Mountain, Framingham, MA 01701-9168 USA AM746706 Rev. 01...

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