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HM-54
HM-54
ON
MAIN
DIRECT
SOURCEMAIN INPUT
LEVEL
PHONES
OO
MAX
OO
MAX
OO
MAX
OO
MAX
OO
MAX
LEVEL
MAIN
DIRECT
SOURCE
PHONES
LEVEL
MAIN
DIRECT
SOURCE
PHONES
LEVEL
MAIN
DIRECT
SOURCE
PHONES
LEVEL
HM-54
2 3 41
HEADPHONE MIXER/AMPLIFIER
HM-54 Features
Front Panel
All four headphone amplifiers share the same features:
• Dual-sources for each channel
• Individual front panel level controls
•
Front and rear panel phone outputs for each channel
• Balanced inputs
1. MAIN INPUT LEVEL
This adjusts the main mix input signal level coming
into the HM-54 LINE INPUT and PHONES INPUT jacks
on the rear panel.
2. PHONES Jack
Plug your headphones into this jack. It carries the
same signals that appear on the rear panel PHONES
OUTPUT jacks [8].
You can also connect an in-ear monitor (IEM) system to
the PHONES jack to provide an individual monitor mix.
Note: Since the PHONES output delivers a higher signal
level than a standard line-level output, you may need to
turn thePHONES LEVEL control down more than usual.
Note: Plugging headphones into the front panel
PHONES jack automatically disconnects the signal from
the rear panel PHONES jack.
WARNING: The headphone amps
are designed to drive any standard
headphones to a very loud level.
We’re not kidding! They can cause
permanent hearing damage. Even
intermediate levels may be painfully
loud with some headphones.
BE CAREFUL! Always start with the PHONES level
turned all the way down before connecting headphones
to the PHONES jack. Keep it down until you’ve put on
the headphones. Then turn it up slowly. Why? Always
remember: “Engineers who fry their ears, find
themselves with short careers.”
3. SOURCE Select Switch
This switch allows you to select either the main mix
input signal or the direct input signal for the headphone
amp source.
CAUTION: Make sure the main mix
input signal and the direct input
signal are roughly equivalent in
volume before switching between
the two. If you have the headphone
amp LEVEL control [4] adjusted for one, and the other
signal is considerably louder, you could damage your
hearing. Follow the procedure described in “Set the
Levels” on page 5.
4. LEVEL Control
This adjusts the volume for each individual
headphone output. It affects both PHONES OUTPUT
jacks (front and rear panel).
5. Power Switch
This one is self-explanatory. When the power switch is
turned ON (up), power is supplied to the HM-54 and the
power ON indicator lights up.