K305 AFC - Earphones AKG - Free user manual and instructions

USER MANUAL K305 AFC AKG

6.1 Connecting the Transmitter to AC Power . . . . . 7

6.2 Connecting the Transmitter to Your Audio Source . 7

6.3 Charging the Batteries in the Headphones . . . 7

1 Introduction Dear customer: Thank you for purchasing an AKG product. The K 305 AFC/K 405 AFC wireless headphone system is based on advanced UHF transmission technology. In order to make optimum use of the benefits of your K 305 AFC/K 405 AFC, please take a few minutes to read the instruc- tions below carefully before operating the equipment. Please keep the manual for future reference. 2 Description The K 305 AFC/K 405 AFC 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, or TV set 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). The K 305 AFC/K 405 AFC system is available for two differ- ent LPD frequency bands: 914 MHz for the US and 864 MHz for various European countries. To share your listening enjoyment with other persons, you can operate your transmitter with several headphones simultaneously. K 305 AFC/K 405 AFC headphones are available separately. 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

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 12 VDC, 200 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.7

ENGLISH 4 Unpacking Your headphones system package contains the following components: K 305 AFC or K 405 AFC headphones T 305 AFC or T 405 AFC transmitter Connecting cable with stereo mini jack plug and L/R RCA plugs for con- necting the transmitter to your audio source Stereo mini jack to 1/4” adapter jack AC adapter for powering the transmitter Two 1.2 V AAA size NiCd recharge- able batteries for powering the headphones (inside the headphones) If anything is missing, contact your AKG dealer immediately. 5 Controls

3. Charging contacts

4. Battery compartment (beneath the ear pad)

9. FREQ ADJUST: frequency tuning control

and operating modes 6 Operating Notes

6.1 Connecting the Transmitter to AC Power

1. Connect the cable on the supplied AC adapter to the DC 12 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 transmitter will automatically be ready to operate. Note that the transmitter will switch on as soon as it de- tects 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

channel) 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 trans- mitter rear panel.

3. Connect the stereo mini jack plug on the connecting cable to

the headphones output of your audio source (refer to 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. 7, plug the red RCA connector (right

channel) on the supplied connecting cable into the red LINE OUT R or REC OUT R socket and the white RCA connector (left channel) 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. 8).

6.3 Charging the Batteries in the Headphones

In order to ensure the longest possible service life for the re- chargeable batteries, we deliver them uncharged. Therefore, charge the supplied batteries before first operat- ing your headphones system. The supplied batteries have been inserted into the headphones for your convenience.

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. Use the POWER switch (1) to switch the headphones off.

When the power is off, the POWER LED (2) will be dark.

2. Referring to fig. 11, place the headphones on the trans-

mitter such that the charging pins (10) on the transmitter will engage the charging contacts (3) on the bottom of the left- hand earphone. The POWER ON/CHARGE LED (11) on the transmitter willlight 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

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

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

ENGLISH 9 Troubleshooting Symptom No sound. POWER ON/ CHARGE LED does not light. Headphone sound is in mono. Noise. Distorted sound. Possible Cause

1. AC adapter is not connected to transmitter

2. Transmitter is not connected to audio source.

3. Connected audio source is switched off.

4. Volume control on audio source is at zero.

5. Batteries are low.

6. Headphones are switched off.

7. VOLUME control on headphones is at zero.

1. Transmitter is not connected to AC power.

2. Batteries are not correctly aligned with polarity

3. Headphones are incorrectly positioned on trans-

1. Connected audio source operates in mono

2. Transmitter is not correctly connected to audio

1. Transmitter and receiving frequencies are not

2. Audio level at transmitter input is too low.

3. Input signal is noisy.

4. Batteries are low.

1. Audio level at transmitter input is too high.

2. Transmitter and headphones carrier frequencies

do not match exactly.

3. Batteries are low.

1. Connect AC adapter to transmitter and/or AC

2. Connect transmitter to audio source.

3. Switch audio source on to feed signal to

4. Set audio source volume to desired level.

5. Charge batteries.

6. Switch headphones on.

7. Set VOLUME control to desired level.

1. Connect transmitter to AC power.

2. Check orientation of batteries in battery compart-

3. Place headphones on transmitter correctly.

1. Switch audio source to stereo mode.

2. Check cable connection between transmitter and

4. Charge batteries.

1. Decrease audio source volume.

2. Use FREQ ADJUST control on transmitter to select

carrier frequency and press AUTOTUNING switch on headphones.

3. Charge batteries.

10 Warranty Conditions AKG warrants AKG products against evident defects in material and workmanship for a period of one year from the date of original purchase for use. This Warranty does not cover damage resulting from misuse or abuse, or lack of reasonable care, or inadequate repairs performed by unauthorized service centers. Performance of repairs or replacements under this Warranty is subject to submission of the sales slip. Shipment of defective items for repair under this Warranty will be at the customer’s own risk and expense. This Warranty is valid for the original purchaser only. This Warranty does not cover dry or rechargeable batteries. Limited Warranty (valid in the United States only) AKG warrants AKG products against evident defects in material and workmanship for a period of one year and agrees to repair or, at our option, replace any defective unit without charge for either parts or labor. This Warranty does not cover dry or rechargeable batteries. Important: This Warranty does not cover damage resulting from accident, misuse or abuse, lack of reasonable care, the affixing of any attachment not provided with the product, loss of parts, or connecting the product to any but the specified recep- tacles. This Warranty is void unless service or repairs are per- formed by an authorized service center. No responsibility is assumed for any special, incidental, or consequential damage. However, the limitation of any right or remedy shall not be effec- tive where such is prohibited or restricted by law. Simply take or ship your AKG products prepaid to our service department. Be sure to include your sales slip as proof of purchase date. (We will not repair transit damage under the no-charge terms of this Warranty.) Note: No other warranty, written or oral, is authorized by AKG Acoustics. This Warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Some states do not allow the exclusion or limitation of incidental or con- sequential damage or limitations on how long an implied warranty lasts, so the above exclusion and limitations may not apply to you.10 Table des matières