Spectra DAX-275 User manual

Telephone Headset
Amplifier
Owner s Manual
(DAX-275)

[02]

Introduction
Your new headset amplifier is a device that helps you to use your
telephone, computer and external audio device through a headset. It
gives you hands free, fatigue-free conversation through a headset at
the same time.
Please read this manual carefully that you can quickly learn the
functions provided.
1. Features & Overview
2. How to install
Stage 1. Installing batteries
Stage 2. Connecting to your telephone, headset
3. How to test before use
Stage 1. Checking for Compatibility
1. Compatibility setting between telephone and amplifier
2. Compatibility setting between headset and amplifier
Stage 2. Checking for optimal sound
1. Adjustment of Listening / Transmission Volume
2. Adjustment of dip switch(Transmission Level)
4. Operation
5. Troubleshooting
6. Warranty
[03]

[04]
1. Features & Overview

1. Mute Button
(= Battery test)
Press the button to cut off the
microphone temporarily. Just
depress the button to resume
communication with your caller.
If the battery test indicator does
not light by pressing mute
button, replace all the batteries.
(Operational battery life : not
less than 2,000 hours)
2. Listening Volume Controller
You can increase or reduce the
volume of your caller s voice.
3. Handset / Headset Button
Press it for handset use and
depress it for headset use.
4. Battery test indicator
Press mute button, if it does not
right, replace all batteries.
5. Tone control switch
Set the tone Control Switch to
be soften or normal.
6. External power supply jack
()
You can use AC power adapter
(3V DC) instead of battery.
7. Handset Jack (HANDSET)
Connect your handset to this
jack.
8. Telephone jack (TEL)
Connect a telephone curly cord
supplied between the handset
jack of your telephone and
amplifier.
9. Stereo Jack for Recorder
The Stereo plug of recorder can
be connected (Option).
10. Telephone Compatibility
Switch
Compatibility setting between
telephone and amplifier.
11. Headset Compatibility
Swithch
Select the knob to the left or
right until you can hear.
12. Dip switch
For transmission level and
dynamic microphone.
[05]
Features

13. Transmission volume
controller
Set the volume controller by
sliding the knob when it
becomes optimal sound for your
caller.
14. Headset Jack
Connect your headset to this
jack.
15. Security cover
16. Battery cover
17. Telephone curly cord
Connect this cord between
telephone and amplifier.
18. Headset Hanger
19. Attenuated cord( Option)
Connect the attenuated cord
between stereo jack for recorder
and recorder s for call
recording.
[06]

[07]
2. How to install
Stage 1. Installing Batteries
We recommend two AA alkaline
batteries (Not included) for installation.
Operational battery life are about 2,000
hours.
- Remove the battery cover on the side
of amplifier.
- Install two AA alkaline batteries and
replace the battery cover
- Press the Mute button to confirm if
the batteries are well fitted or not.
* Note : Alternatively, if you want to use AC power
supply (Not included), you can connect AC
adapter (3V DC OUT / 100mA~300mA) to
external power supply jack. (Feature no.6).
Stage 2. Connecting to your
telephone, headset
1. Unplug your telephone s handset
cord from the telephone base and
plug it into the handset jack of
amplifier(Feature no. 7)

2. Connect a telephone curly cord
(Feature no.17) between the
handset jack of your telephone and
Telephone jack of amplifier
(Feature no.8)
3. Plug one complete headset to the
headset jack of amplifier (Feature
no.14) located on the front side of
the cabinet
[08]

[09]
3. HOW TO TEST BEFORE USE
Stage 1. Checking for
Compatibility
Wearing the headset, Lift the handset
from its cradle, position it off-hook and
listen.
1.Compatibility setting between
telephone and amplifier
If you can t hear dial tone at factory
setting, adjust the compatibility
switch between telephone and
amplifier as follows
1) Remove the Security cover which
is located on the side of amplifier.
2) Slide the compatibility switch by
clicks until you can hear a clear
dial tone.
3) If the transmission voice can not
be heard or very low, slide
Microphone Selection Switch to
“c”
REVISION
“
”

Stage 2. Checking for
Optimal Sound
1. Adjustment of listening
/ Transmission volume
Firstly, place the digit no.5 of listening
volume controller to the center and set
the white marking part of microphone
volume controller to the center.
After the above setting, if the unit is not
working properly, use the following
adjustments for the best set-up.
1) If there is beep sound, slide the
Transmission volume controller to
the right side(-) for low volume. And
if Listening / Transmission is low,
slide Transmssion volume
controller to the left(+) and increase
Listening volume controller at the
same time until they are increased
for proper level for your caller.
2) If there is humming tone, adjust
both Listening and Transmission
volume controller to the low volume
side at the same time.
[010]