DACS Audio HeadLite2 - Manual (Page 5)

Levels
The amplifier section can deliver up to 0.5W RMS per channel and has a fixed gain of
20dB. The volume potentiometer varies the input level to the amplifier stage. Too
high an input level here will reduce the useful control over the output volume, since it
will have to be set very low to ensure that the output does not clip. To adjust this level
see below - 3 & 7 Inputs.
Note on the problems of Loudness and Headphones
Our amplifier cannot do the impossible! We can only make headphones as loud
as they are capable of being. Beyond that they distort and clip, which is very bad
for your ears, short and long term. The problem usually is not so much that the
headphones are not loud enough; it is more that the sounds outside are too loud
and are breaking through into your ears. Approached from this direction the
problem can be solved more easily.
2 & 8 Inputs
Connections
Inputs A, B, C and D are on three pole ¼” jack sockets, tip=signal, ring and
sleeve=0V. Balanced signals may be used on three pole jack plugs (with the screen
removed at one end as per your earthing strategy), or unbalanced signals may be
used on two pole jacks. The input impedance is 10k ohms.
If no connector is plugged in, the inputs are shorted to 0V via the switch connections
on the jacks. If the inputs are connected to a patchbay, it is advisable, if possible, to
normalise them. Do this at the patch bay, unless they are normalised and left floating,
they may be prone to pick up interference, taxis or the radio over long lines between
the unit and the patchbay.
Levels
The input buffer’s sensitivity can be adjusted for +4dBu or -10dBV operation using
the switches. Note: Channel A & B sensitivity are selected by one switch and
Channel C & D sensitivity by the other. It is not possible to select different
sensitivities for the paired channels.
DACS LTD, Stonehills, Shields Road, PELAW, Gateshead, Tyne and Wear NE10 0HW
Tel: +44 (0) 191 4382500 | Fax: +44 (0) 191 4382511 | www.dacs-audio.com | [email protected]