light red to indicate that the batteries in the headphones are being charged. If signal is present at the transmitter audio input, the POWER
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
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 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: | |
8
