Comfort audio DC20 Instructions For Use Manual

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Comfort Digisystem

Conference Microphone DC20

Instructions for use

English

Contents

I. User guide.....................................................................7

1. Introduction............................................................9

Your device......................................................................9

SST™.........................................................................9

Overview.................................................................10

Included accessories.............................................13

2. Getting started.....................................................15

Charge...........................................................................15

Start up..........................................................................17

Navigate the menu........................................................17

3. Usage....................................................................19

Meetings and conferences............................................19

Attend a meeting....................................................20

Use a lecture microphone.....................................20

Telephone conversations..............................................21

Bluetooth®..............................................................22

Landline..................................................................24

External audio sources.................................................26

Connect an external audio source.........................26

II. For professionals.......................................................29

4. Basic setup...........................................................31

Change the menu language..........................................31

Name the device............................................................31

5. Pairing Comfort Digisystem devices.....................33

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The pairing button.........................................................33

Change channel.............................................................34

Available channels.................................................35

Send pairing information..............................................36

Receive pairing information..........................................37

Pair the remote control.................................................38

6. Advanced features................................................39

Use a remote microphone for telephony......................39

Use Tel only to save power...........................................39

Tone adjustments..........................................................40

Adjust Treble and Bass..........................................40

Adjust the equalizer...............................................40

Perceptual Speech Enhancement.................................41

Adjust the PSE compensation................................41

Bluetooth settings.........................................................42

Adjust the level of your own voice.........................42

Change the default microphone mode..................42

Remove all paired Bluetooth devices....................43

Lock the buttons............................................................43

PIN code settings..........................................................43

Set a PIN Code.......................................................43

Choose which functions to lock.............................44

Hide the PIN entry dialogue...................................45

Change the PIN code.............................................45

Disable the PIN code..............................................45

FFC.................................................................................46

Reset all settings...........................................................46

Appendices.....................................................................49

A. Product information.............................................51

Menu overview...............................................................51

Conference Microphone DC204

Function indicator.........................................................54

Microphone modes........................................................56

Optional accessories.....................................................58

Technical specifications................................................59

B. Radio....................................................................61

Channel planning..........................................................61

Radio range...................................................................61

C. Battery maintenance............................................63

Replacing the remote control battery...........................63

D. Troubleshooting...................................................67

Service and warranty......................................................69

Service centers.....................................................................69

Contact information..............................................................71

Product symbols.............................................................73

5Conference Microphone DC20

Conference Microphone DC206

User guideI.

This part of the instruction manual covers day-to-day tasks that a user of the product should be familiar with.

7Conference Microphone DC20

Introduction1.

Thank you for choosing Conference Microphone DC20!

Conference Microphone DC20 is part of

Comfort Digisystem

™

that uses digital wireless technology to give you the best sound quality available, together with secured transmission to prevent eavesdropping.

To get the most out of your new product, please read these instructions before using it for the first time. Take special notice to the printed document

Important Safety Instructions

included in

the box.

Your device

Conference Microphone DC20 is an advanced microphone offering the option of setting the size and shape of the sound registering area. It can be connected to two Bluetooth equipped telephones, as well as to a landline telephone using the Telelink accessory. A built-in receiver allows you to set up a system with several wireless microphones from the Digisystem line up.

SST

™

SecureStream Technology (SST)

is Comfort Audio's proprietary digital transmission technology. It lets you communicate securely and latency free with other Comfort Digisystem devices.

9Conference Microphone DC20

Overview

On/Off button

Pairing button

3. Function indicator

4. Menu controller

5. Charger input

6. Aux input and output

7. Multifunction socket

8. Microphone

9. Display

10. Mode buttons

11. Answer button

12.

Receiver mute button

13.

Microphone mute button

Conference Microphone DC2010

Display

Ch:2 Ch:A54

“NAME”

1. Transmitter channel

2. Receiver channel

3. Battery status

4. Signal quality

5. Key lock padlock

6. Unit name

7. Current aux setting

8. Current microphone mode

9. Receiver status

10. Transmitter status

11. Bluetooth enabled

12. Bluetooth connection status

13. Mic mute active

14. Receiver mute active

11Conference Microphone DC20

Remote DC05

Overview

1. Function indicator

2. Receiver off / Receiver volume down

3. Receiver on / Receiver volume up

4. Microphone off

5. Microphone on

6. Narrow omni mode

7. Wide omni mode

8. Battery compartment

Conference Microphone DC2012

Charging stand

Overview

1. Charger socket

2. USB socket

3. Input 1

4. Input 2

Included accessories

Necklace

Microfibre pouch

13Conference Microphone DC20

Clip on microphone

Power supply

Charging stand

Cable split

Remote DC05

Audio-kit

Conference Microphone DC2014

Getting started2.

This section will teach you how to perform the basic steps needed to get started.

Charge

Charging can be done at any time. If you make it routine to charge your product whenever you do not use it, it is always ready for use when you need it.

Insert the supplied charger into the charger input.

Caution: Only use the charger supplied by Comfort Audio AB. Using any other type of charger might damage your device.

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Plug the charger into the wall socket.

The function indicator turns red to indicate charging.

Note: The unit might become warm during charging, this is entirely normal. The unit is equipped with overcharging- and temperature monitoring to protect the batteries.

The charging is done when the function indicator turns green.

Conference Microphone DC2016

Start up

Press until the start up bar is fully lit.

Use to select the microphone mode that gives you the best speech perception.

Navigate the menu

You can use on the side of the unit to navigate your way through the menu.

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Press to activate the menu.

Flick the controller up or down to select the desired menu option.

Press to enter the selected sub menu or activate the selected menu option.

When done, use the Back option to move to the previous menu.

Conference Microphone DC2018

Usage3.

Your product is highly flexible and well suited for several situations where good speech perception is important.

Meetings and conferences

In meetings and conferences it is vital to be able to follow along in the discussions without straining to hear. With the conference microphone you can hear persons around you loud and clear without the need for a pass-around microphone or complex arrangements. With the included remote control it is possible to adjust the settings without disturbing the meeting.

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Note: Functions that are accessible from the remote are indicated with .

Attend a meeting

For typical discussions around a table, a conference microphone placed in the middle of the table will be enough to capture the voices of all participants.

Place the conference microphone on the table; as close to the participants as possible.

Choose an omni directional microphone mode with .

Adjust the volume on your receiver to a suitable level.

Use a lecture microphone

At larger meetings and conferences, with a lecturer, the built in receiver allows you to use an additional Comfort Digisystem microphone (purchased separately) that is clipped on to the lecturer.

Conference Microphone DC2020

Place the conference microphone on the table; as close to the participants as possible.

Activate the built in receiver using .

Turn on the lecturer's microphone.

Verify that the signal quality indicator symbol ( ) in the display is lit up red.

Adjust the volume on your receiver to a suitable level.

If needed, adjust the volume of the lecturer through the menu Inputs > Receiver gain.

(A long press on the receiver buttons one the remote control will adjust the volume as well.)

Telephone conversations

Hearing on the phone is often difficult when using hearing aids. The conference microphone can help you hear clearly on both landline and mobile phones.

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Note: For usage with landline phones the TeleLink accessory is needed.

Bluetooth

Thanks to Bluetooth technology this product can be used as a wireless handsfree for a Bluetooth equipped phone. Up to two devices can be connected at the same time.

Pair a Bluetooth device

Conference Microphone DC20 and the Bluetooth device needs to be

paired

before they can be used together.

Select Communication > Bluetooth.

Make sure Bluetooth is enabled. If not, select Enable.

Select:

• Pair Mobile to pair a mobile phone.

• Pair Phone to pair a DECT™ phone.

The pairing sequence will start, which means that the unit is discoverable by your Bluetooth device.

Start pairing

sequence in

your phone

PIN:0000

Search for new equipment on your Bluetooth device (please refer to the user manual of the device).

Conference Microphone DC2022

When found, select DC20 in the list of found devices.

If asked for a PIN, enter the PIN code shown in the display of your Comfort Digisystem unit.

If the pairing is successful Paired with and the name of your Bluetooth device will appear in the display.

Paired

with

"name"

Answer a call

When the phone rings, the text Answer? will be shown in the display.

To answer, press .

Tip: Use to adjust the call volume.

When done talking, hang up by pressing again, or by using your phone.

Make a call

On most phones you can initiate a call from the phone or via the Bluetooth headset.

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Use

one

of the following methods to make a call:

DescriptionOption

The sound will automatically be transferred to Conference Microphone DC20.

Use your phone to dial the number.

Press for approx. 2 sec.Re-dial the last called

number.

Press briefly, approx 1/2 sec.

Activate voice dialing.

Note: The different dialling options is dependent on the phone being used. Please refer to the user manual of your phone.

When done talking, hang up by pressing again, or by using your phone.

Landline

With the help of the TeleLink accessory (purchased separately) the Conference Microphone DC20 can be connected to a landline telephone.

Note: Please refer to the TeleLink manual for a description of the connection procedure.

Conference Microphone DC2024

Answer a call

Make sure the TeleLink is in telephone mode. The light next to the function button should be blue. If not, press the function button.

Lift the handset from the cradle, or press the answering button on the phone.

Talk into the conference microphone.

25Conference Microphone DC20

Make a call

Make sure the TeleLink is in telephone mode. The light next to the function button should be blue. If not, press the function button.

Lift the handset from the cradle, or press the answering button on the phone. Listen for the dial tone.

Dial the number on the phone.

Talk into the conference microphone.

External audio sources

You can connect any sound source that has a line out socket to the device. This lets you listen to television, conference telephones, voice recorders and the like. It is also possible to connect an external microphone, such as a clip-on microphone, or a pair of headphones.

Connect an external audio source

Connecting an external audio source will bring up a menu where you can select the type of device you have connected.

Conference Microphone DC2026

Connect your external audio source to the aux socket. For line sources you can use the supplied audio cable. The Inputs menu will be shown automatically.

Select the option that corresponds to the device you have connected.

DescriptionOption

Computer, TV, music player etc.Line In

Boom microphone, clip on microphone etc.

Microphone in

Headphones or earphones.Headphones out

Adjust the volume for the respective option till you find a suitable level.

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For professionalsII.

The following sections cover advanced features and procedures primarily intended for professionals and advanced users.

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Basic setup4.

Before setting up the product you should make sure that the menu is set to the preferred language.

Change the menu language

The default menu language is English. You can change language from the menu Settings.

Select Settings > Language.

Select the language you want from the list of available languages.

Name the device

To help identify the device, you can enter a name that will be shown in the display.

Select Settings > Name.

Use to scroll through the list of characters. Press to enter the selected character.

When done select . (To cancel, select instead.)

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Pairing Comfort Digisystem devices

By pairing two or more Comfort Digisystem devices you ensure that they can communicate securely with each other.

Comfort Digisystem is a digitally encrypted communication system that relies on unique

code keys

to provide transmission security. Any units that are to be used together needs to be set to the same channel and share the same code key.

When you perform a pairing procedure you send information about the channel and code key from one unit to one or several others. This lets you create a channel and code key combination on one unit and distribute it to other units to form a system.

The information about the channel and code key is referred to as

pairing information

. Conference Microphone DC20 is able to both

send and receive pairing information.

Important: At delivery all units share the same factory code key. To make the system secure, you need to generate a new code key.

The pairing button

All Comfort Digisystem units are equipped with a pairing button. The pairing button gives you quick access to the pairing features of the device.

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Table 1: Pairing short cuts accessible through the pairing button.

DescriptionOption

Takes you to the pairing menu.A single press.

Sets the unit to receive pairing information. (For units with more than one channel, this affects the transmitter channel only.)

A long press.

Sends pairing information. (For units with more than one channel, this affects the transmitter channel only.)

A double press.

Change channel

If a channel does not suit your setup, or if you are experiencing interference from some other radio source, you can change to a different channel via the Channel menu.

Select Communication > Channel.

Conference Microphone DC2034

Select:

DescriptionOption

Set the channel for the built-in transmitter.

Transmitter

Back Transmitter Receiver

Set the channel for the built-in receiver.

Receiver

Back Transmitter Receiver

Choose the channel you wish to use in the channel list.

Back 1 863.250 MHz 2 864.000 MHz 3 864.750 MHz

The green circle next to the frequency indicates that the channel is free from interference. If the channel is occupied the circle will be grey.

Available channels

In most European countries, channels 1-3 (863.250 – 864.750 MHz) may be used for hearing products. In addition to channels 1-3, there are several channels in bands A-F, which require a licence in most European countries. These are found under the Extended option.

35Conference Microphone DC20

Important: Always verify with the local frequency assignment authority which channels are free to use and which require a licence.

Send pairing information

By sending pairing information from Conference Microphone DC20 you can synchronise its channel and code key with another unit. Any existing pairing information in the other unit will be overwritten.

Select Communication > Pair

Choose whether to pair the transmitting or receiving channel by selecting one of the following options:

• Transmitter

• Receiver

Set the unit or units that you would like to pair with Conference Microphone DC20 to receive pairing information.

Conference Microphone DC2036

To send the pairing information, select

one

of the following

options:

DescriptionOption

Send the

existing

code key.Send Info

Back Send Info Receive Info New Code Key

Generate and send a

new

code

key.

New Code Key

Back Send Info Receive Info New Code Key

Important: This will break the pairing with any previously paired units.

When the info is sent the text Info sent! will appear in the display.

Receive pairing information

When the unit is set to receive pairing information its current channel and code key will be overwritten by the received information.

Set the unit to receive information by selecting Communication > Pair.

37Conference Microphone DC20

Choose whether to pair the transmitting or receiving channel by selecting one of the following options:

• Transmitter

• Receiver

Select Receive Info.

Send pairing information from the unit you are pairing with Conference Microphone DC20.

If the pairing is successful, the word OK will appear in the display of Conference Microphone DC20.

Pair the remote control

To prevent others to remotely control Conference Microphone DC20, the remote control will only work with the device it has been paired with. If the remote has been replaced, e.g. during service, the pairing procedure needs to be redone.

Select Settings > Remote control.

Make sure Enabled is checked.

Select Pair.

Press any button on the remote.

If the pairing is successful, the word OK will appear in the display of Conference Microphone DC20.

Conference Microphone DC2038

Advanced features6.

This product has special features and settings that lets you tailor the unit to the user's specific needs.

Use a remote microphone for telephony

An additional Comfort Digisystem microphone (purchased separately) can be used during phone calls as a remote microphone. This is particularly useful when making phone calls in a noisy environment such as an open office space.

You can activate the remote microphone feature for Bluetooth and landline separately:

• For Bluetooth, select Communication > Bluetooth.

• For landline, select Inputs > TeleLink.

Enable Remote Mic..

Use Tel only to save power

If the device is mainly used for telephony, the operating time can be improved by enabling the Tel only feature. When this feature is active the device will only transmit radio during phone calls.

Select Communication > Bluetooth. (The feature is also accessible from Inputs > TeleLink.)

Enable Tel only.

39Conference Microphone DC20

Tone adjustments

The unit provides the possibility to adjust the frequency response of the sound. For example, the response can be adjusted to lessen the harsh sound of rustling paper or to reduce excessive bass that can mask higher frequencies.

Note: The settings are saved separately for each microphone mode.

Adjust Treble and Bass

The treble and bass adjustments lets you do a rough adjustment of the unit's frequency characteristics. This is useful if, for example, the user finds the overall sound to be too thin or harsh.

Select Sound > Treble and Bass.

Select the desired frequency range by pressing .

Flick up or down to adjust the level of the selected frequency range.

Press to confirm your choice. The next frequency range will be selected automatically.

Press to save the settings or to cancel.

Adjust the equalizer

Use the equalizer to perform detailed adjustments of the frequency response.

Select Sound > Equalizer.

Conference Microphone DC2040

Flick up or down to adjust the level of the selected frequency range.

Press to confirm your choice. The next frequency range will be selected automatically.

Press to save the settings or to cancel.

Perceptual Speech Enhancement

(PSE) is a powerful digital sound processing technology that is unique to Comfort Audio's conference microphones. The technique is used to optimize speech intelligibility in challenging acoustic environments, where a microphone can not be placed in close proximity to the speaker. This may be situations where a near field microphone would be perceived as intrusive or too troublesome, such as in workplace meetings or dinners. PSE emphasises speech and effectively reduces unwanted noise and sounds that impair speech intelligibility. The PSE feature is active in the omni directional microphone modes, and when using an external microphone.

Adjust the PSE compensation

The PSE compensation determines how much the volume should be increased to compensate for the perceived loss of loudness that occurs in a noisy environment. Increase this setting if you find the volume too low in noisy situations. The setting is only effective in the omni directional microphone modes, and is saved separately for each mode.

Select Sound > Advanced settings.

Select PSE comp..

41Conference Microphone DC20

Flick up or down to adjust the degree of compensation.

Press to confirm your choice.

Bluetooth settings

The Bluetooth settings let you adjust how the unit should function when connected to a Bluetooth equipped device.

Adjust the level of your own voice

Hearing your own voice during telephone calls can prevent you from talking to loud or feeling confined. The voice monitoring can also be used to allow communication with the surrounding environment while making a telephone call.

Note: This function can only be adjusted during an ongoing telephone call.

Select Communication > Bluetooth.

Select Mix level and adjust the level by flicking up or down.

Press to confirm you choice.

Change the default microphone mode

When entering a telephone call the unit will automatically change to a pre-selected microphone mode. You can change the default microphone mode for Bluetooth calls in the Bluetooth menu.

Select Communication > Bluetooth > Mic. mode.

Conference Microphone DC2042

Use to choose a microphone mode

Save the selection by pressing .

Remove all paired Bluetooth devices

If you have problems with a Bluetooth device or want to redo the pairing you can remove all paired Bluetooth devices with the menu option Clear settings.

Select Communication > Bluetooth > Clear settings.

All paired devices are cleared from memory.

Lock the buttons

If you want to avoid accidental button presses it is possible to lock all functions by activating the key lock. (You can always use the On/Off button regardless of the key lock.)

Select Activate Key Lock.

An orange padlock symbol will appear in the display of the device.

PIN code settings

To prevent tampering or unintentional changes of the settings, you can lock the product with a four digit PIN code. You can choose to lock all of the features or a selected category.

Set a PIN Code

Select Settings > PIN Code.

Check Enabled.

43Conference Microphone DC20

Use to scroll through the list of characters. Press to enter the selected character.

Enter new PIN

1000 0

When done select . (To cancel, select instead.)

Important: Make note of the PIN code. If you forget the PIN, contact your point of purchase.

Choose which functions to lock

By selecting which functions to lock with the PIN code you can allow access to commonly used functions while preventing access to others.

Select Settings > PIN Code > Lock Select.

Select the functions you want to lock:

DescriptionOption

Lock access to the Pair menuPair

Lock access to all menus.All Menus

Conference Microphone DC2044

Hide the PIN entry dialogue

To reduce the temptation to guess the PIN, the PIN entry dialogue can be hidden. The user then has 3 seconds from start up to access the dialogue before it is hidden.

Select Settings > PIN Code > Lock Select.

Select Hide PIN Entry.

Change the PIN code

To change the current PIN you must first enter the current PIN.

Select Settings > PIN Code.

Enter the current PIN code.

Select Change PIN.

Enter the new PIN code.

Select to confirm PIN.

Disable the PIN code

If you no longer wish to lock access to the unit, you can disable the PIN code. The PIN will be reset and a new code will have to be entered if you choose to enable it again.

Select Settings > PIN Code.

Enter the current PIN code.

Uncheck the Enabled option.

45Conference Microphone DC20

FFC

Free Frequency Check

(FFC) makes it easy to find available frequencies. When a channel is free from interference, a green circle will be shown next to the channel in the channel selection menu.

Back 1 863.250 MHz 2 864.000 MHz 3 864.750 MHz

If is checked, the background noise for each channel will be shown in dBm.

Back 1 863.250 MHz -105 2 864.000 MHz -79 3 864.750 MHz -103

Note: The circle will turn green at a noise level of > -80 dBm.

Reset all settings

If you need to reset all settings to their default values, you can do a factory reset.

Select Settings > Factory Reset.

Conference Microphone DC2046

Select Yes.

Important: All settings will be lost. Any pairing needs to be redone.

47Conference Microphone DC20

Appendices

49Conference Microphone DC20

Product informationA.

Menu overview

Back

Back Channel Pair Bluetooth

Communication

Back Treble and Bass Equalizer Advanced settings

Sound

Back Mic/Line in Charger Unit TeleLink Receiver gain

Inputs

Back Charge Language PIN Code Activate Key Lock Name Remote control Factory Reset

Settings

51Conference Microphone DC20

Activate Key Lock

About

Back

Leave the current menu.

Communication

Settings for radio channels and pairing.

Change the transmitting and receiving channel.Channel

Pair the unit with another Comfort Digisystem device. Allows you to generate a new code key to make the system secure.

Pair

Connect the microphone to any mobile phone with Bluetooth.

Bluetooth

Sound

Settings that affect the sound quality.

Simple adjustment of the unit's equalizer.

Treble and Bass

Advanced adjustment of the frequency response in eight bands.

Equalizer

Adjust the PSE-compensation.Advanced settings

Inputs

Settings for various audio inputs.

Input type and gain level.Mic/Line in

Conference Microphone DC2052

Input gains for the charger unit.Charger unit

Input and output gain when using the TeleLink accessory.

TeleLink

Gain for the built-in receiver.Receiver gain

Settings

General settings.

Lock the unit with a PIN code to prevent tampering.

PIN Code

When Auto Power Off is activated, the unit will turn

off

when charged. Auto Restart will start the unit when charging is interrupted. Default is to stay on during charging.

Charge

Set the menu language.Language

Give the unit a name to help identify it.Name

Enable auto key lock to prevent accidental button presses after the screen has faded.

Key lock

Toggle the function indicator on or off.Func.Indicator

Activate and pair the remote control.Remote control

Reset the unit to factory settings. All settings will be lost!

Factory Reset

Activate Key Lock

Manually activate the key lock. Also activated by pressing followed by .

53Conference Microphone DC20

About

Information about the firmware version.

Function indicator

The

function indicator

gives you information about the units current

status.

Table 2: Microphone mode indications

IndicationStatus

Music mode

Narrow omni mode

Wide omni mode

Zoom mode

Table 3: Pairing indications

IndicationStatus

Ready to receive pairing information

Pairing information sent.

Conference Microphone DC2054

IndicationStatus

Information received

Table 4: Charging indications

IndicationStatus

Charging in progress

Charging complete

Low battery

Note: Charging is not indicated if the device is turned on and placed in the TeleLink.

Note: If the unit is on while charging the function indicator stays red even when the battery is fully charged.

Table 5: Remote control indications

IndicationStatus

Command received

55Conference Microphone DC20

Table 6: Bluetooth indications

IndicationStatus

Pairing mode active

Pairing successful

Call in progress

Settings cleared

Microphone modes

Conference Microphone has four different microphone modes that are selectable with . The two omni modes can also be selected with the remote control.

Music mode

Suitable for music listening, or in very quiet environments with favourable acoustics. PSE disabled.

Wide omni directional mode

Conference Microphone DC2056

Enhances speech and suppresses interfering noise. Strong amplification of soft sounds. Suitable for most occasions where several persons needs to be heard. PSE enabled.

Narrow omni directional mode

Enhances speech and suppresses interfering noise. Less amplification of soft sounds. Suitable for exceptionally noisy environments and in smaller groups and meetings. PSE enabled.

Directional mode

Directional pick up pattern. Suitable for telephony or in conversations with a single individual in noisy environments. For best effect, the microphone should be placed near the sound source. PSE disabled.

57Conference Microphone DC20

Note: When set to zoom mode, the direction of the pick up pattern will change automatically if the device is placed in the charger stand or TeleLink accessory.

Optional accessories

The following accessories can be used with your product:

Soft case

Conference Microphone DC2058

Boom microphone, black

Boom microphone, beige

TeleLink

Technical specifications

SST - SecureStream TechnologyType of

transmitter/receiver

Approx. 30 mRange

115 x 62 x 14 mmDimensions

90 gWeight

852 - 872 MHzFrequency range

transmitter

(f2) 768 - 785 MHz , (f1) 824 849 MHz

Frequency range receiver

59Conference Microphone DC20

Built-inAntennas

Up to 10 hours. Dependent on usage conditions. Measured with factory settings.

Operating time

Up to 5 hours.Charging time

Combination of four built-in microphones, directional and omnidirectional

Microphone

Mic/Line in, socket for testing with headphones, socket for charger unit and Telelink

Connections

Version 2.1Bluetooth protocol

Handsfree Profile (HFP), Headset Profile (HSP)

Supported profiles

CR2025, Li-MnBattery remote control

Conference Microphone DC2060

RadioB.

Comfort Digisystem relies on radio technology to transfer the sound between transmitters and receivers. Like all radio systems, it communicates on specific channels. If you use two transmitters on the same channel, or neighbouring ones, there may be interference. Other electronic equipment can also interfere with radio transmissions.

Channel planning

To achieve optimal radio performance you need to take into account the distance between transmitters and their frequencies. A longer distance between transmitters allows you to use frequencies that are closer together.

When both the transmitter and the built-in receiver are in use, the transmitted and received frequency should be at least 15 MHz apart for optimal operation.

The frequency difference between the transmitted and received frequency must not be 26.0 MHz exactly. Conference Microphone DC20 blocks the option to set the frequencies in this way.

If several transmitting frequencies are being used in the same room, the frequency differences between the units should be at least 1 MHz for optimal operation.

Radio range

The radio range between the units is around 30 m. However, this may vary depending on the particular environment you are in.

61Conference Microphone DC20

Battery maintenanceC.

This product uses Lithium-Ion Polymer technology. Lithium-Ion batteries do not suffer from so called memory effects and do not need to be routinely discharged to preserve performance.

The battery's capacity will degrade over time. This is normal for all rechargeable batteries. Battery lifetime is dependent on usage patterns. The battery is preferably charged little and often; it will reach 90% of its capacity after half its charging time. If stored for long periods of time, the battery is best left semi-charged. Contact your point of purchase when it is time to change the battery.

Operating times vary depending on which features are used. Features such as Bluetooth and the built-in transmitter can be disabled to extend operating times.

Replacing the remote control battery

The remote control comes equipped with a replaceable 3 volt lithium battery (CR2025). Under normal circumstances the battery will last for several years. The battery needs replacement when the remote control function indicator is dimly lit or does not light up at all.

63Conference Microphone DC20

Gently push the latch to release the battery holder.

Pull out the battery holder.

Conference Microphone DC2064

Insert the new battery into the battery holder.

Caution: Observe the polarity. Failing to do so might damage the device.

Push the battery holder into the battery compartment.

65Conference Microphone DC20

TroubleshootingD.

Consult the following guide if you have problems with your equipment. If you still have questions, please contact your point of purchase.

SolutionCauseSymptom

• Charge the battery.

•

Press for at least 2 sec.

• The battery is depleted.

•

is released too soon.

• The device does not start.

• Unmute the microphone and/or receiver.

• Reduce the distance to the speaker.

• The microphone and/or receiver is muted.

• The distance between the microphone and the person speaking is too long.

• Poor speech intelligibility.

• Reduce the distance to the receiver. Maximum distance is approx. 30 m.

• The distance between the microphone and the receiver is too long.

• Poor range and/or static interference.

• Redo the pairing procedure. See

Pairing Comfort Digisystem devices

on page 33

• The units are not paired.• Loud hissing noise (no

sound transfer).

• Disable Auto Power Off• Auto Power Off is

activated.

• Device will not start during charging.

67Conference Microphone DC20

SolutionCauseSymptom

• Select a different channel. See

Change

channel

on page 34

• The selected channel is unsuitable for use.

• Incorrect channel.

Please select again, or Channel interference! Please select again is shown on the

display.

• Mute the built-in receiver by pressing

• Redo the pairing procedure. See

Pairing Comfort Digisystem devices

on page 33

• Interference from some other radio source is affecting the built-in receiver.

• The built-in receiver is not paired with its corresponding transmitter.

• Speech is coming through but considerable background noise is heard.

• Make sure that your Bluetooth device supports any of the necessary profiles. See

Technical specifications

• The Bluetooth device does not support the necessary profiles.

• The Bluetooth device will not pair with Conference Microphone DC20.

• Unmute the microphone.

• Redo the pairing procedure. See

Pairing Comfort Digisystem devices

on page 33

• The microphone is muted.

• The transmitter and receiver channel does not match.

• No sound is heard.

Conference Microphone DC2068

Service and warranty

Comfort Audio AB accords a limited warranty for two years as of the date of delivery. This covers all defects of manufacture and materials. For accessories the warranty period is 90 days as of the date of delivery. Local agreements or regulations may exist. Defects caused by careless handling or intervention inside the product or its accessories are not covered by the warranty.

If you are in a need of service on your device, please contact your point of purchase. You are always welcome to contact Comfort Audio if you have any questions.

Service centers

Head office

SWEDEN/GLOBAL

+46 35 260 16 00

service@comfortaudio.se

www.comfortaudio.se

69Conference Microphone DC20

Subsidiaries

NORWAYDENMARK

+47 959 87 910 +45 33 78 03 02

service@comfortaudio.no info@comfortaudio.dk

www.comfortaudio.no www.comfortaudio.dk

BENELUXGERMANY

+31 229 21 18 65 +49 711 67 400 224

service@comfortaudio.nl service@comfortaudio.de

www.comfortaudio.nl www.comfortaudio.de

USA

+1 877 635-3529

service@comfortaudio.us

www.comfortaudio.us

Conference Microphone DC2070

Contact information

Head office

SWEDEN

Comfort Audio AB

Box 154

SE-301 05 Halmstad

+46 35 260 16 00

info@comfortaudio.com

www.comfortaudio.com

Subsidiaries

NORWAYDENMARK

Comfort Audio ASComfort Audio ApS

Postboks 304Benediktevej 5, 1.sal

NO-3201 SandefjordDK-3480 Fredensborg

+47 959 87 910 +45 33 78 03 02

info@comfortaudio.no info@comfortaudio.dk

www.comfortaudio.no www.comfortaudio.dk

71Conference Microphone DC20

BENELUXGERMANY

Comfort Audio BVComfort Audio GmbH

Nieuwe Steen 20Curiestraβe 2

NL-1625 HV HoornDE-70563 Stuttgart

+31 229-87 01 10 +49 711 67 400 224

info@comfortaudio.nl info@comfortaudio.de

www.comfortaudio.nl www.comfortaudio.de

USA

Comfort Audio Inc.

411 E. Business Center Drive

Suite 109

Mount Prospect, IL 60056, USA

+1 888 421-0843

usa@comfortaudio.com

www.comfortaudio.us

Conference Microphone DC2072

Product symbols

The product complies with the European directive 93/42/EEC, including amendments, concerning medical devices. The product complies with the essential requirements of the European Directive 1999/5/EC, including amendments, concerning Radio and Telecommunications terminal equipment.

The product is covered by the European directive 2002/96/EC, including amendments, concerning Waste Electrical and Electronic Equipment (WEEE). Recycle the product and its accessories according to national regulations.

Direct current.

Restriction of usage related to transmitted frequencies may apply, due to national regulations.

Connector for battery charger.

73Conference Microphone DC20