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APPENDIX C: HMS-10 SPECIFICATIONS
HMS-10 Specifications
ACOUSTICAL
Operating Frequency Range 55 Hz – 18 kHz
Note: Recommended maximum operating frequency range. Response depends on loading condi-
tions and room acoustics.
Frequency Response 58 Hz – 17.5 kHz ±4 dB
Note: Measured free-field with pink noise at 1 meter, 1/3rd octave resolution.
Maximum Peak SPL 126 dB
Note: Measured free-field with music, referred to 1 meter.
Dynamic Range 100 dB
Note: Taken from peak SPL, referred to A-wtd noise floor.
Phase Response 290 Hz – 18 kHz ±45°
Coverage 80° symmetrical
Acoustical Crossover 2.5 kHz
Note: At this frequency, the transducers produce equal sound pressure levels.
TRANSDUCERS
Low Frequency One 10" low-frequency long excursion cone driver
High Frequency One 2" high-frequency diaphragm compression driver
CONNECTOR
Audio/Power Connector Single Phoenix 5-pin male (3 pins for balanced audio, 2 pins for DC power)
Power Wiring Pin 1: 48 V DC –
Pin 2: 48 V DC +
Audio Wiring Pin 3: Chassis/earth through 220 k:, 1000 pF, 15 V clamp network to provide virtual ground lift at
audio frequencies
Pin 4: Signal –
Pin 5: Signal +
AUDIO INPUT
Type Differential, electronically balanced
Maximum Common Mode Range ±15 V DC, clamped to earth for voltage transient protection
Input Impedance 10 k: differential between pins 4 (–) and 5 (+)
DC Blocking Differential DC blocking on input up to the maximum common mode voltage
CMRR >50 dB, typically 80 dB (50 Hz – 500 Hz)
RF Filter Common mode: 425 kHz
Differential mode: 142 kHz
TIM Filter <80 kHz, integral to signal processing
Nominal Input Sensitivity 6.0 dBV (2.0 V rms, 2.8 V peak) continuous average is typically the onset of limiting for noise and
music
Input Level Audio source must be capable of producing +16 dBV (6.3 V rms, 9.0 V peak) into 600 :to produce
the maximum peak SPL over the operating bandwidth of the loudspeaker
AMPLIFIER
Amplifier Type Two-channel complementary MOSFET output stages (class AB/Bridged)