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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.
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 trans-
mitter 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
transmitter until the POWER LED (2) extinguishes. Press the
POWER switch (1) once to switch the headphones off.
Recharge the batteries as described above.
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. 9.
2. Remove the old batteries.
3. Referring to fig. 10, 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 aligning the four pins
on the ear pad with the matching openings in the earphone
base plate.
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 ADJUST control (9) on the transmitter to its
center position.
4. Use the POWER switch (1) to switch the headphones on, so
that the green POWER LED (2) will light. 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 ADJUST control (9) to a
different position and press AUTOTUNING (5) again. Be
sure not to rotate FREQ ADJUST (9) all the way CW or CCW
because optimum reception may not always be guaranteed
at the ends of the frequency band.
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 (multi-
path reception) or shadow effects, the headphones will auto-
matically mute. This function eliminates interference related
noise.
6.6 POWER ON/CHARGE LED Status
If LED is... Transmitter...
…lighting green: …is connected to AC power and audio
source and receives signal.
Headphones are not on the transmitter,
charging function is off.
…lighting orange: …is connected to AC and audio
source and receives signal.
Headphones are on the transmitter,
charging function is on.
…lighting red: …has detected no signal for several
minutes, headphones are on the trans-
mitter, charging function is on.
…dark: …has detected no signal for several
minutes, headphones are not on the
transmitter, charging function is off, OR
…is not connected to AC power.
7 Important Notes
1. Operating switches on or connecting the transmitter to your
audio source may cause clicks which at high volume settings
may affect your hearing. Therefore, be sure to set the
VOLUME control on the headphones to minimum before
switching between different sources (tuner, turntable, CD play-
er, etc.) or connecting the transmitter.
2. Listening over headphones at high volume levels, particularly
over extended periods of time, may damage your hearing.
3. Your K 305 AFC/K 405 AFC is a radio frequency device
that conforms to the strict European and FCC standards. For
physical reasons that have nothing to do with the quality of the
product, extremely strong interference sources may affect
reception. In order to maintain interference-free listening plea-
sure, do not operate your K 305 AFC/K 405 AFC in the
close vicinity of radio equipment, cellular telephones, or direct-
ly above TV or computer monitor picture tubes. The supplied
connecting cable is long enough to allow the transmitter to be
placed at a safe distance from interference sources.
Interference caused by other users of the 914 or
864 MHz LPD band are beyond AKG’s control.
8 Specifications
System Performance
Modulation: FM
Carrier frequency band: 914/864 MHz (LPD band)
T 305 AFC/T 405 AFC Transmitter
Power supply: 12 VDC, 200 mA
Radiation angle: approx. 360°
Weight: approx. 9.2 oz. (260 g)
Max. range: approx. 330 ft. (100 m)
K 305 AFC Headphones
Power supply: 3 VDC (2 x 1.2 V AAA size NiCd
rechargeable batteries supplied)
Battery life: approx. 10 hours
(NiCd rechargeable batteries)
Frequency range: 20 Hz to 22,000 Hz
K 405 AFC Headphones
Power supply: 3 VDC (2 x 1.2 V AAA size NiMh
rechargeable batteries supplied)
Battery life: approx. 20 hours
(NiMh rechargeable batteries)
Frequency range: 20 Hz to 24,000 Hz
K 305 AFC/K 405 AFC Headphones
Max. SPL: >110 dB SPL
Weight: approx. 8.1 oz. (230 g)
Distortion: <1%
Type: semi-open dynamic headphones
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