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APPENDIX A: ACHERON DESIGNER SPECIFICATIONS
ACOUSTICAL
Operating Frequency Range 37 Hz – 18 kHz
Note: Recommended maximum operating frequency range. Response depends on loading
conditions and room acoustics.
Frequency Response 38 Hz – 17 kHz ±4 dB
Note: Measured free field with 1/3 octave frequency resolution at 4 meters.
Phase Response 230 Hz to 17 kHz ±30°
Maximum Peak SPL 130 dB
Note: Measured free field with music referred to 1 meter.
Dynamic Range >110 dB
Coverage 80° horizontal by 50° vertical
Crossover 680 Hz
Note: At this frequency, both transducers produce equal sound pressure levels.
TRANSDUCERS
Low Frequency One 12” cone driver
Nominal impedance: 2
Voice coil size: 4”
High Frequency One 4” compression driver
Nominal impedance: 8
Voice coil size: 4”
Diaphragm size: 4”
Exit size: 1.5”
AUDIO INPUT
Type Differential, electronically balanced
Maximum Common Mode Range ±5 V DC, clamped to earth for voltage transient protection
Connectors Female XLR input with male XLR loop output
Input Impedance 10 k differential between pins 2 and 3
Wiring Pin 1: Chassis/earth through 1 k, 1000 pF, 15 V clamp network to provide virtual ground lift at
audio frequencies
Pin 2: Signal +
Pin 3: Signal –
Case: Earth ground and chassis
DC Blocking Differential DC blocking 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 10 dBV (3.2 V rms, 4.5 V peak) continuous is typically the onset of limiting for noise and music
Input Level Audio source must be capable of producing +20 dBV (10 V rms, 14 V peak) into 600to pro-
duce the maximum peak SPL over the operating bandwidth of the loudspeaker
AMPLIFIER
Type Two-channel, Class-D