LD Systems HPA 6 - Manual (Page 7)

CONNECTIONS, CONTROLS, AND INDICATORS:
2 DIRECT IN
Additional stereo line input (6.3 mm jack) without volume control (adjust the volume on the source player)
The signals of the DIRECT IN and MAIN INPUT are mixed together as a stereo signal.
3 LEVEL METER
8-segment LED level meter for the MAIN INPUT and the DIRECT IN. Once the CLIP LED lights up, the line
input is operating at peak level. It is not critical if the LED lights briefly at peak levels for the incoming signal,
however continuous illumination should be avoided by reducing the volume.
4 AUX IN (CH1 - CH6)
Separate stereo line input channels 1 to 6 (CH1 - CH6) with 6.3 mm jack socket. The AUX IN input signal
is located only on the headphone output of the corresponding channel (signal AUX IN CH1 is only on the
headphone output HEADPHONE OUT CH1, etc.). The balance between the MAIN INPUT line-input and AUX IN
line-input can be adjusted individually on the INPUT MIX controller of the respective channel.
5 INPUT MIX (CH1 - CH6)
Balance control for setting the input volume ratio between MAIN INPUT line input and the AUX IN line input of
the respective channel CH1 to CH6. In the centre position, the audio signals of both MAIN INPUT and AUX IN
line-inputs are reproduced in the same ratio.
6 HEADPHONE OUT (CH1 - CH6)
6.3 mm stereo jack for connecting headphones (channel CH1 to CH6). Up to 3 headphones can be connected
to each channel using a 6.3 mm jack, one at the front and two on the back. Make sure that the total impedance
of all headphones connected to the corresponding channel is not less than 8 ohms. CAUTION: Very high sound
pressure levels may occur that could permanently damage your hearing!
7 PHONES LEVEL (CH1 - CH6)
Volume control for the headphone output of the respective channel CH1 to CH6. IMPORTANT: Before connecting
headphones, turn the volume controller PHONES LEVEL of each channel to a minimum (counter-clockwise) to
prevent equipment damage and permanent hearing damage. After plugging in the headset, increase the volume
by turning the volume control slowly to the right (clockwise).
8 MONO SWITCH WITH LED INDICATOR (CH1 - CH6)
Once the mono switch is pressed, the LED indicator of the respective channel will light up and the signals
from the MAIN INPUT, DIRECT IN and AUX IN line inputs are mono summed in the corresponding channel
(CH1 - CH6).
9 MUTE SWITCH LEFT / RIGHT (CH1 - CH6)
The left and/or right channel of the stereo signal of a headphone output can be muted using the MUTE L (left)
and R (right) switch. For example: If the MUTE switch L (left) is pressed, only the signal from the right channel
can be heard on the right side of the headphones. In addition, if the mono-switch is pressed, you will hear
the right-channel signal in mono on both sides of the headphones in the same ratio.
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