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Owner’s Manual
Owner’s Manual
AC Power Requirements
Power Consumption: 12 watts
U.S. and Canada: 120 VAC, 50/60 Hz
AC Connector: 3-pin IEC 250 VAC
Physical Dimensions and Weight
Height: 1.75 in/44 mm
Width: 17.0 in/432 mm (main body of unit)
19.0 in/483 mm (with rack ears)
Depth: 5.3 in/135 mm
Weight: 5.5 lb/2.5 kg
LOUD Technologies Inc. is always striving to improve our prod-
ucts by incorporating new and improved materials, components,
and manufacturing methods. Therefore, we reserve the right to
change these specifications at any time without notice.
“Mackie.” and the “Running Man” are registered trademarks of
LOUD Technologies Inc. All other brand names mentioned are
trademarks or registered trademarks of their respective hold-
ers, and are hereby acknowledged.
©2005 LOUD Technologies Inc. All Rights Reserved.
Appendix C: Technical Info
HM-54 Specifications
Frequency Response
Main Input to any Output (Level @ 12 o’clock):
+0, –1 dB, 20 Hz to 20 kHz
Distortion (THD & IMD)
Main Input to any Output (@ +4 dBu output):
THD+N: < 0.01%, 20 Hz to 20 kHz BW,
1 kHz input
@ +4 dBu, Level @ 12 o’clock
Noise
Residual Output Noise:
–103 dBu (all outputs off, 600Ω load)
–97 dBu (all outputs @ 12 o’clock, 600Ω load)
Input Sensitivity
0 dBu = 1.5 mW/600Ω (Level @ 12 o’clock)
Input Gain Control Range
Main Input to any Output:
4 dB maximum
Rated Output
Maximum Rated Output (1 kHz):
100 mW ±0.5 dB @ 1% THD
(60Ω load, all channels driven)
140 mW ±0.5 dB @ 1% THD
(60Ω load, one channel driven)
150 mW ±0.5 dB @ 1% THD
(240Ω load, all channels driven)
195 mW ±0.5 dB @ 1% THD
(240Ω load, one channel driven)
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
5.3 in/135 mm
1.75 in/
44 mm
(1 rack space)
19.0 in/483 mm
17.0 in/432 mm
WEIGHT
5.5 lb/
2.5 kg