Meyer Sound Acheron LF
The Acheron LF loudspeaker can be paired with the Acheron 80 or Acheron 100 screen channel loudspeaker to deliver the low-frequency headroom required by larger theatres. The self-powered Acheron LF with dual 15-inch drivers boosts the headroom on the LCR channels be converting each Acheron loudspeaker to a system with three low-frequency drivers in an aligned column.
The unique multi-way, gradated design offers smooth coverage and maximum low-frequency impact with all drivers active at the lowest frequencies and each rolling off, one at a time, via the integral active crossover. This technique eliminates interference between drivers that would otherwise occur at shorter wavelengths, enabling the system to maintain ideal polar, phase, and frequency responses throughout the low and low-mid operating ranges. As a result, the system can deliver the necessary power to completely fill a large theatre with rich, clean sound, thereby ensuring that the full intensity and nuance so carefully crafted into today’s movie soundtracks reach every listener without compromise.
The Acheron LF was designed exclusively for use with Acheron loudspeakers. The Acheron LF’s 37 Hz to 370 Hz operating frequency range and 136 dB maximum peak SPL were carefully chosen to compliment the Acheron. The Acheron LF also features the same high-power 15-inch cone driver used in the low frequency section of the Acheron. Engineered to deliver optimum performance, the high-excursion, backvented drivers include 4-inch voice coils and are housed in a tuned, vented enclosure that shares the same rectangular footprint as the Acheron.
The Acheron LF is powered by an onboard two-channel class AB/H amplifier with complementary MOSFET output stages. Total output power is 2250 W (4500 W peak) and provides the system with enough headroom to easily accommodate the extreme demands of digital soundtracks. The optional RMS remote monitoring system allows comprehensive monitoring of system parameters on a Windows-based computer.
Strategically placed 3/8-inch threaded points on the side corners of the Acheron LF cabinet allow the unit to be mounted to floors with optional mounting brackets. The Acheron 100 and Acheron 80 can be mounted on top of the Acheron LF with uptilt or downtilt with optional stacking brackets.
The loudspeaker shall be a self-powered bass system. The transducers shall consist of two 15-inch cone drivers (with 4-inch voice coils), each rated to handle 1200 AES* watts.
The loudspeaker shall incorporate internal processing electronics and a two-channel amplifier. Each amplifier channel shall be class AB/H with complementary MOSFET output stages. Burst capability shall be 1125 watts total with a nominal 4-ohm resistive load. Total burst power shall be 2250 watts (4500 wattspeak). Distortion (THD, IM, TIM) shall not exceed 0.02%. The audio input shall be electronically balanced with a 10 kOhm impedance and accept a nominal 10 dBV (3.2 V rms, 4.5 V peak) signal.
Connectors shall be XLR type male and female. RF filtering shall be provided, and CMRR shall be greater than 50 dB (50 Hz – 500 Hz). Performance specifications for a typical production unit shall be as follows, measured at 1/3-octave resolution: operating frequency range shall be 37 Hz to 370 Hz; phase response shall be ±30° from 60 Hz to 230 Hz; maximum peak SPL shall be 136 dB at 1 meter, free field.
The internal power supply shall perform automatic voltage selection, EMI filtering, soft current turn-on, and surge suppression. Power requirements shall be nominal 100 V, 110 V, or 230 V AC line at 50 or 60 Hz. UL and CE operating voltage range shall be 100 to 240 V AC. Maximum peak current draw during burst shall be 19.0 A at 115 V AC, 9.5 A at 230 V AC, and 22.0 A at 100 V AC. Current inrush during soft turn-on shall not exceed 7 A at 115 V AC, 7 A at 230 V AC, and 10 A and 100 V AC.
AC power connectors shall be locking NEMA L6-20 male inlet or IEC 309 male inlet.
The loudspeaker system shall include support for the optional RMS remote monitoring system module. All loudspeaker components shall be mounted in an acoustically vented enclosure constructed of premium birch plywood with a black textured finish. Dimensions shall be 31.00″ wide x 36.18″ high x 20.50″ deep (787 mm x 919 mm x 521 mm). Weight shall be 185 lbs (83.91 kg). Optional bracket adapters shall allow the Acheron LF to be fixed to floors.
The loudspeaker shall be the Meyer Sound Acheron LF. *Driven continuously for two hours with a band-limited noise signal having a 6 dB peak-average ratio.
As part of the EXP line of cinema products, the Acheron LF loudspeaker can be paired with the Acheron 80 or Acheron 100 screen channel loudspeaker to deliver the low-frequency headroom required by larger theaters. The self-powered Acheron LF with dual 15-inch drivers boosts the headroom on the LCR channels by converting each Acheron loudspeaker to a system with three low-frequency drivers in an aligned column.
– Exceptional fidelity and extended highfrequency performance
– Constant-Q horn yields uniform response throughout the coverage area
– Extraordinarily flat amplitude and phase response for tonal accuracy
– Wide horn coverage available for larger, wider rooms with the Acheron 100
– Narrow, focused coverage available for smaller rooms with the Acheron 80
– Seamless integration with the Acheron LF loudspeaker and HMS-10 surround loudspeaker
– Small to medium-sized theatres
– Larger theatres with use of Acheron LF
– Re-recording stages
– Production and postproduction studios