Setting Up The System; Using Headphones - AKG Acoustics HEARO 999 AUDIOSPHERE II Mode D'emploi

lular telephones, or directly above TV or computer monitor picture tubes. The supplied
connecting cables are long enough to allow the HEARO 999 AUDIOSPHERE II to be
placed at a safe distance from interference sources.
Interference caused by other users of the same frequency band are beyond AKG's control.
If you use the HEARO 999 AUDIOSPHERE II with wireless headphones, you will first need to
charge the batteries in the headphones, referring to the instruction manual that comes with
your headphones.
1. Switch ON the audio source to which the HEARO 999 AUDIOSPHERE II is connected.
2. Push the ON switch (1) to switch the HEARO 999 AUDIOSPHERE II ON.
3. Point the antenna (19) straight upward.
4. Use the DIGITAL switch (2) to activate either the LINE IN analog input (the DIGITAL LED
is dark) or the DIGITAL input (the DIGITAL LED is lit).
To activate the OPTICAL input push the DIGITAL IN switch (17) IN, to activate the
COAXIAL input push the DIGITAL IN switch (17) OUT. (You can not, however, listen to
both audio sources simultaneously.)
5. Use the INPUT control (3) on the HEARO front panel to set the input level such that the
INPUT LED next to the INPUT control (3) will flicker green in step with the input signal or
light green steadily, occasionally flashing red on extremely loud sounds. Turn the INPUT
control (3) CCW just enough to stop the INPUT LED flashing red.
There is no need to set the input level for digital input signals. Therefore, the INPUT
control (3) is disabled as soon as you push the DIGITAL switch (8) IN.
You can use the HEARO 999 AUDIOSPHERE II with both digital wireless and hardwire stereo
headphones.
1. Switch the headphones ON. The green POWER LED on the headphones will illuminate
Note that the transmitter incorporated in the HEARO 999 AUDIOSPHERE II will not come
on until audio signal is present at the transmitter input.
As soon as audio signal is present at the transmitter input, the FREQ. LED (4) on the
HEARO will illuminate green.
If no signal arrives at the transmitter input for approx. 3 minutes, the built-in transmitter
will automatically switch off and the FREQ. LED (4) will extinguish. The PHONES and
LINE outputs, though, remain active.
If the FREQ. selector (4) is in the "0" position, the transmitter is out of circuit. To switch
the transmitter back on, set the FREQ. selector (4) to "1", "2", or "3".
2. Set the frequency selector on the headphones to the same channel as the FREQ. selec-
tor (4) on the transmitter.
If you hear noise or beep sounds on the headphones, set both the FREQ. selector (4) on
the HEARO and the frequency selector on the headphones to a different channel.
3. Set the VOLUME control on the headphones to the desired volume level.
Beep sounds audible in the headphones mean that the received signal is too weak, the
headphones receive no signal, or that the headphones are tuned to a different frequency
than the transmitter. Move closer to the transmitter or repeat step 2 above.
1. Set the FREQ. selector (4) to "0" to switch the built-in transmitter out of circuit.
2. Connect the stereo jack plug on your hardwire stereo headphones to the PHONES jack (5).
3. Use the VOLUME control (6) to set the volume of the headphones.
To adjust your HEARO 999 AUDIOSPHERE II to your hearing with extra precision, visit
http://www.akg.com and go to "Downloads" to download two dedicated test signals in WAV
or MP3 format. Use the first signal, "Applause", to make a shortlist of the best ear matching
curves. The second signal, "Acoustic Guitar Solo", is a pure mono signal (identical signals in
the left and right channels) for "choosing the winner".
Of course, you may as well use applause and a mono signal rich in transients (such as a solo
piece for acoustic guitar) from an existing sound carrier.
1. Set the MODE selector (9) to "DIRECT".
2. Set the SOUND selector (11) to one of the three "MUSIC" positions.
3. Start the "Applause" test signal.
4. Set the MODE selector (9) to "IVA PHONES" and the EARS selector (10) to "N". Set the
MODE selector (9) to "DIRECT" to compare thes ound of the processed test signal with
the unprocessed test signal.
5. Make a list of the three or four ear matching curves where you perceived the smallest
4 Operating Notes
4.2 Setting Up the
System
Note:

4.3 Using Headphones

4.3.1 Wireless
Headphones
Note:
4.3.2 Hardwire
Headphones
4.3.3 Test Signals for
Choosing Ear Matching
Curves
Making a shortlist
19