06_07
1 Introduction
Dear customer:
Thank you for purchasing an AKG product.
The K 930 wireless headphone system is
based on advanced UHF transmission technology.
In order to make optimum use of the benefits of your K 930,
please take a few minutes to read the instructions
below carefully
before operating the equipment.
Please keep the manual for future reference.
2 DESCRIPTION
The K 930 headphone system
> USES STATE-OF-THE-ART UHF RADIO TRANSMISSION TECHNOLOGY
> FEATURES AN ”AUTOTUNING” FUNCTION THAT AUTOMATICALLY TUNES
THE HEADPHONES TO THE TRANSMITTER FREQUENCY FOR OPTIMUM
RECEPTION
> CONNECTS TO ANY AUDIO, VIDEO, TV SET, PC, OR NOTEBOOK COMPUTER
WITH A HEADPHONES, LINE, OR RECORDING OUTPUT
> PROVIDES PERFECT SOUND REPRODUCTION, FULL MOBILITY, AND
SIGNAL TRANSMISSION THROUGH WALLS AND CEILINGS OVER A
DISTANCE OF UP TO 330 FEET (100 M) UNDER IDEAL TRANSMISION
CONDITIONS (FREE FIELD)
To share your listening enjoyment with other persons, you can
operate your transmitter with several headphones simultaneously.
3 Precautions
1. Operate the headphones with two AAA size 1.2 V
rechargeable (supplied) or 1.5 V dry batteries only.
2. Never try to charge dry batteries using the transmitter’s
charging feature.
3. Before charging the headphones batteries, always make
sure that the batteries in the headphones are rechargeable
types.
4. Dispose of spent dry or rechargeable batteries conforming to
local waste disposal rules. Never throw batteries into fire.
5. Operate the transmitter with the supplied 9 VDC, 500 mA AC
adapter only. Check that the AC voltage stated on the AC
adapter is the same as that available in your country. Using
the transmitter with a different AC adapter voids the warranty.
6. Always switch the headphones OFF after use.
7. Never try to open the headphone or transmitter case.
Refer servicing to qualified service personnel only.
8. Never place the equipment near heat sources such as
radiators or electric heaters or expose it to direct sunlight,
excessive dust, humidity, rain, temperatures below freezing,
or impacts.
9. Never use alcohol, petroleum-based cleaners, or paint
thinners to clean the headphones or transmitter.
10. If you do not use your headphones system for an extended
period of time (e.g., when traveling), disconnect the AC
adapter from the AC outlet.
11. Also refer to section 7 Important Notes.
4 Unpacking
Your headphones system package contains the following components:
If anything is missing, contact your AKG dealer immediately.
5 Controls
5.1 Headphones (Fig. 1)
(1)
POWER switch:
switches power to the headphones
On and OFF.
(2)
Status LED:
illuminates green to indicate power to
the headphones is ON, and red to indicates the batteries
inside the headphones are being charged.
(3a)
Charging contacts
(3b)
Charging jack
for optional external charger
(4)
Battery compartment
(beneath the detachable ear pad)
(5)
AUTOTUNING switch:
activates the automatic
tuning function
(6)
VOLUME
control
5.2 Transmitter (Fig. 2)
(7)
AUDIO IN L/R, :
audio input sockets
(8) DC 9 V:
DC input jack for AC adapter
(9)
FREQ:
frequency selector
(10)
Charging contacts
(11)
POWER ON/CHARGE:
tri-color LED indicating charging
and operating modes
>
K 930 HEADPHONES
>
T 930 TRANSMITTER
>
CONNECTING CABLE WITH STEREO MINI JACK
PLUG AND L/R RCA PLUGS
FOR CONNECTING THE
TRANSMITTER TO YOUR AUDIO SOURCE
>
STEREO MINI JACK TO 1/4” ADAPTER JACK
>
AC ADAPTER
FOR POWERING THE TRANSMITTER
(9 V DC, 500 mA)
>
TWO 1.2 V AAA SIZE RECHARGEABLE BATTERIES:
NICD, 300 mAh
FOR POWERING THE HEADPHONES
(INSIDE THE HEADPHONES)
6 Operating Notes
6.1 Connecting the Transmitter to AC Power
1. Connect the cable on the supplied AC adapter to the
DC 9 V
jack (8)
on the transmitter rear panel as shown in fig. 3.
2.
Check that the AC voltage stated on the AC adapter is the
same as that available in your country.
If it is, connect the
AC adapter to a convenient AC outlet (see fig. 4). The trans-
mitter will automatically be ready to operate.
Note that the transmitter will switch on as soon as it detects
an audio signal at the AUDIO IN jacks or the
jack.
6.2 Connecting the Transmitter to Your Audio Source
You may connect the transmitter to a headphones output
(mini jack or 1/4” jack), LINE, or REC outputs.
6.2.1 Connecting to a Headphones Output
1. Before connecting the transmitter to your audio source,
switch the audio source OFF.
2. Referring to fig. 5, plug the red RCA connector (right chan
nel) on the supplied connecting cable into the red
AUDIO IN R
socket (7)
and the white RCA connector (left channel) into
the white
AUDIO IN L socket (7)
on the transmitter rear panel.
3. Connect the stereo mini jack plug on the connecting cable
to the headphones output of your audio source (fig. 6).
4. If the headphones output on your equipment is a 1/4” jack,
plug the supplied mini jack to 1/4” adapter jack onto
the connecting cable. Connect the adapter jack to the
headphones output.
6.2.2 Connecting to a LINE or REC Output
1. Before connecting the transmitter to your audio source,
switch the audio source OFF.
2. Referring to fig. 6, plug the red RCA connector (right chan-
nel) on the supplied connecting cable into the red LINE OUT R
or REC OUT R socket and the white RCA connector (left chan-
nel) into the white LINE OUT L or REC OUT L socket on your
audio source.
3. Connect the stereo mini jack plug on the connecting cable to
the
jack (7)
on the transmitter rear panel (see fig. 7).
6.3 Charging the Batteries in the Headphones
In order to ensure the longest possible service life for the
rechargeable batteries, we deliver them uncharged, inside the
headphones.
Therefore, you will need to charge the supplied
batteries before first operating your headphones system.
Before charging, pull the protective foil away from the earphone
in a straight movement.
> WARNING: If you operate the headphones on dry batteries
(see section 6.4), never try to charge the batteries using
the transmitter’s charging feature. This would cause
serious damage to your headphone system.
Dispose of spent batteries conforming to local waste
disposal rules.
1. Referring to fig. 11, place the headphones on the transmitter
such that the charging
contacts (3)
on the bottom of the
left-hand earphone will rest on the charging
contacts (10)
on the transmitter.
The
POWER ON/CHARGE LED (11)
on the transmitter will
light red to indicate that the batteries in the headphones are
being charged. If signal is present at the transmitter audio
input, the
POWER ON/CHARGE-LED (11)
will light orange.
If the
POWER ON/CHARGE LED (11)
fails to illuminate, rotate
the headphones to the point that the
charging contacts (3)
will rest on the
charging contacts (10)
on the transmitter.
The batteries will be fully charged after approximately 7
hours. (The
POWER ON/CHARGE LED (11)
will continue
lighting red.). You may leave the headphones on the transmitter
for as long as you like without risking to overcharge the
batteries.
> IMPORTANT: In order to maintain full battery capacity
for as long as possible, discharge the batteries completely
about once a month:
Switch the headphones on and leave them outside the trans-
mitter until the
status LED (2)
extinguishes.
Recharge the batteries as described above.
6.3.1 Optional External Charger
Alternatively, you use can the optional external charger to
charge the batteries as shown in fig. 11. The batteries will be fully
charged within approximately 7 hours.
1. Plug the charger cable into the
charging jack (3b)
on the
headphones.
2. Plug the charger into a convenient power outlet.
The
status LED (2)
on the headphones will illuminate red
to indicate that the batteries are being charged.
> NOTE: You can use the K 930 headphones even while
charging batteries.
6.4 Replacing Batteries
The capacity of any rechargeable battery will decrease over time.
If you feel that you need to recharge the supplied batteries more
often than would be convenient, you may consider replacing the
batteries with new AAA size 1.2 V rechargeable or 1.5 V alkaline
dry batteries.
1. Remove the ear pad from the left-hand earphone
as shown in fig. 8.
2. Remove the old batteries.
3. Referring to fig. 9, insert the new batteries into the
battery
compartment (4)
. Make sure to align the batteries with the
polarity marks inside the battery compartment.
4. Replace the ear pad on the earphone and rotate the ear pad
CW to the point that the ear pad will click into place.
6.5 Setting Up the System
1. Remove the headphones from the transmitter.
2. Switch ON the audio source to which the transmitter
is connected.
If audio signal is present at the transmitter input, the
POWER
ON/CHARGE LED (11)
on the transmitter will light green.
> Note: If no signal arrives at the transmitter input for approx.
3 minutes, the transmitter will automatically switch off and
the
POWER ON/CHARGE LED (11)
will extinguish.
3. Set the
FREQ selector (9)
on the transmitter to its
center position.
4. Use the POWER
switch (1)
to switch the headphones on,
so that the
status LED (2)
will illuminate green. Press the
AUTOTUNING switch (5)
on the headphones.
The Autotuning function will automatically tune the reception
frequency to the carrier frequency set on the transmitter.
After a few seconds, you should hear the signal in the
headphones clearly and free of interference.
If your first try fails, set the
FREQ selector (9)
on the
transmitter to a different position and press
AUTOTUNING (5)
again.
FREQ (9)
lets you select one of three different carrier
frequenices.
5. Set the VOLUME
control (6)
on the headphones to the
desired volume level.
> Note: If the transmitter signal is disturbed, e.g., by
reflections (multipath reception) or shadow effects, the
headphones will automatically mute. This function eliminates
interference related noise.
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21752_CorpDes_AKG_BDA_930_Int_0707.indd 12-13
11.09.2007 9:43:08 Uhr
