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2.6 Dolby Surround Pro Logic
Decoder
2.7 LOGIC7 Decoder
2.8 Controls
2.8.1 Headphones
Refer to fig. 1.
Fig. 1: Headphone controls.
2.8.2 Transmitter
Front Panel
Refer to fig. 2.
Fig. 2: Transmitter front panel
controls.
Note:
The Dolby Surround Pro Logic decoder integrated in the transmitter uses the stereo input signal to derive
two additional signals, a center and a surround channel. The IVA circuitry generates from these signals a
binaural signal equivalent to reproduction through five high quality loudspeakers (three front, two rear
speakers). This allows you to enjoy all the benefits of Dolby surround sound even through headphones.
The integrated LOGIC7 decoder allows recordings in all audio formats (mono, stereo, Dolby Surround,
and LOGIC7) to be accurately reproduced through headphones. Depending on the momentary signal
configuration, two to eight loudspeakers are simulated at any time. Accordingly, the number of simulat-
ed speakers may even change automatically during the same piece.
Also, the LOGIC7 decoder will derive a surround signal from a stereo input signal and is fully compatible
to Dolby Surround.
1. OFF/ON: On/off switch
2. Status LED (green/red):
The Status LED indicates the following conditions:
3. Charging jack and contacts
4. Battery compartment (beneath the detachable ear pad)
5. Frequency selector
6. VOLUME control
7. BALANCE control
The MODE, FREQ, and SOUND keys have dual functions. To toggle between the two functions, press
and hold the key for one second.
If you hold the key for more than one second, the transmitter will keep toggling between the two func-
tions of the key you are pressing.
8. ON: Switches the transmitter on (switch illuminates green) and off (switch extinguishes).
9. MODE/DISPLAY: A short push (less than one second) steps through normal stereo, IVA stereo, IVA
plus Dolby Surround Pro Logic, and IVA plus LOGIC7 modes.
A long push switches the backlighting for all labels except the ON switch and the CHARGE label on
and off.
If you switch the backlighting off, it will come back on automatically as soon as you push any front
panel switch.
If you switch the transmitter off and back on later, the backlighting will come on again, even if you
switched the backlighting off.
The PRO LOGIC, LOGIC7, STEREO, and IVA labels will illuminate to indicate the selected mode:
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HEARO 888 DIGITAL
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LED is lit green.
LED is dark.
LED is lit red.
• Headphones are ON, batteries are OK.
• Headphones are OFF.
• Headphones are ON, batteries are dead or no batteries are
inside the headphones.
• Headphones are OFF, batteries are being charged.
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