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APPENDIX A: ACHERON DESIGNER SPECIFICATIONS
ACOUSTICAL
Operating Frequency Range
Frequency Response
Phase Response
Maximum Peak SPL
Dynamic Range
Coverage
Crossover
TRANSDUCERS
Low Frequency
High Frequency
AUDIO INPUT
Type
Maximum Common Mode Range
Connectors
Input Impedance
Wiring
DC Blocking
CMRR
RF Filter
TIM Filter
Nominal Input Sensitivity
Input Level
AMPLIFIER
Type
37 Hz – 18 kHz
Note: Recommended maximum operating frequency range. Response depends on loading
conditions and room acoustics.
38 Hz – 17 kHz ±4 dB
Note: Measured free field with 1/3 octave frequency resolution at 4 meters.
230 Hz to 17 kHz ±30°
130 dB
Note: Measured free field with music referred to 1 meter.
>110 dB
80° horizontal by 50° vertical
680 Hz
Note: At this frequency, both transducers produce equal sound pressure levels.
One 12" cone driver
Nominal impedance: 2
Voice coil size: 4"
One 4" compression driver
Nominal impedance: 8
Voice coil size: 4"
Diaphragm size: 4"
Exit size: 1.5"
Differential, electronically balanced
±5 V DC, clamped to earth for voltage transient protection
Female XLR input with male XLR loop output
10 k differential between pins 2 and 3
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
Differential DC blocking up to the maximum common mode voltage
>50 dB, typically 80 dB (50 Hz – 500 Hz)
Common mode: 425 kHz
Differential mode: 142 kHz
<80 kHz, integral to signal processing
10 dBV (3.2 V rms, 4.5 V peak) continuous is typically the onset of limiting for noise and music
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
Two-channel, Class-D
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