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APPENDIX A: ACHERON 80 AND ACHERON 100 SPECIFICATIONS
Acheron 80 and Acheron 100 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 700 Hz to 17 kHz ±30°
Maximum Peak SPL 139 dB
Note: Measured free field with music referred to 1 meter.
Dynamic Range >110 dB
Coverage Acheron 80: 80° horizontal by 50° vertical
Acheron 100: 100° horizontal by 50° vertical
Crossover 580 Hz
Note: At this frequency, both transducers produce equal sound pressure levels.
TRANSDUCERS
Low Frequency One high-power 15” cone driver with neodymium magnet
Nominal impedance: 4 Ω
Voice coil size: 4”
Power-handling capability: 1200 W (AES)
Note: Power handling measured using AES standards: transducer driven continuously for two
hours with a band limited noise signal having a 6 dB peak-average ratio.
High Frequency One 4” compression driver
Nominal impedance: 8 Ω
Voice coil size: 4”
Diaphragm size: 4”
Exit size: 1.5”
Power-handling capability: 250 W (AES)
Note: Power handling measured using AES standards: transducer driven continuously for two
hours with a band limited noise signal having a 6 dB peak-average ratio.
AUDIO INPUT
Type Differential, electronically balanced
Maximum Common Mode Range ±15 V DC, clamped to earth for voltage transient protection
Connectors Female XLR input with male XLR loop output
Input Impedance 10 kΩ differential between pins 2 and 3
Wiring Pin 1: Chassis/earth through 220 kΩ, 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 None on input, DC block through signal processing
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