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]
3 & 6 Outputs
Connections
The headphone outputs are on three pole ¼” jack, tip=left, ring=right, sleeve=0V. The
front and rear outputs for each headphone amplifier are connected in parallel. The
output circuitry is designed to drive down long lines with minimal high frequency loss.
If you are sending headphones signals down long lines using screened twin
conductor cable (such as foil screened twin, FST), we would recommend using two
separate cables if you can. This would reduce any
possible
cross-talk between the
left and right channels. There are installations we know of where left and right are
sent down the two conductors of FST, and all reports have been good.
If two or more pairs of headphones are to be driven by an output, they should be of
the same type and impedance. If they are different (eg. low and high impedance),
power sharing will not be even. One will be too quiet, and to achieve the required
level in that pair, the other pair will overload.
4 Earthing
The signal 0V is separate from the mains earth. This separation allows unbalanced
operation with a large measure of immunity to hum problems, since the amplifier is
not referenced to or connected to any earth other than the signal source. The mains
earth is connected to the case of the device. If you wish to connect the signal earth to
the mains earth or a technical earth, this may be done by running a wire from the
earth tag.
This connection should only be made by qualified personnel, if it is
necessary. If in doubt please call us.
5 Sensitivity Switches
On the rear panel, there are sensitivity switches for channels A&B and C&D.
This allows user selection of sensitivity as an operational control, rather than
having to be set with internal links.
7 Volume Control
The HEADPHONE VOLUME control adjusts the signal level going to the amplifier.
This control allows independent volume control of each amplifier’s output.
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