Meyer Sound ACHERON-STUDIO, ACHERON-STUDIO-RMS, ACHERON-STUDIO-YM, ACHERON-STUDIO-YM-R Data Sheet

DATASHEET CINE-STUDIO

Acheron® Studio Screen Channel Loudspeaker

16.79 in

[426 mm]

At the heart of Meyer Sound’s EXP line of cinema products are the
Acheron™ high-performance screen channel loudspeakers. The
Acheron Studio is a compact version of the Acheron 80, making it
ideal for small theaters, re-recording stages, and postproduction
facilities. Optimized for installation behind perforated screens, the
two-way loudspeaker combines the advantages of self-powered
technology and innovative horn design to deliver exceptional,
precise coverage for the left, center, and right sound channels for
cinema. Offering the same 38 Hz to 17 kHz frequency response as
the Acheron 80, as well as a generous peak output with very low
distortion, the Acheron Studio stands up to the most demanding
of digital soundtracks, maintaining a wide dynamic range and full
fidelity.

8.25 in

[210 mm]

30.78 in

[782 mm]

25.38 in

[645 mm]

16.25 in

[413 mm]

16.00 in

[406 mm]

Designed and manufactured at Meyer Sound’s headquarters
in Berkeley, California, the Acheron Studio’s drivers include one
15-inch low-frequency cone driver and one 4-inch high-frequency
diaphragm compression driver. Both drivers yield uncompromising
quality and full bandwidth, and are powered by sophisticated
onboard amplification. The proprietary Meyer Sound power
amplifier is a two-channel, class AB/bridged amplifier with
complementary MOSFET output stages that yields a total output
of 700 W. Built-in signal processing includes electronic crossover
and correction filters—to achieve a flat phase and frequency
response—along with driver protection circuitry. The self-powered
design not only ensures consistent results but also simplifies
installation in both new and existing rooms.

The Acheron Studio uses the same patented horn technology
originally developed for the Acheron 80. Designed specifically
for cinema use, the horn features a very soft roll-off outside its
extremely well-behaved 80° horizontal by 50° vertical coverage
pattern. The horn is fixed within the enclosure to ensure an accurate
acoustic crossover, phase response, and incredibly consistent
vertical pattern. The 580 Hz crossover point places most of the
dialog in the horn, which is ideal for cinema applications.

The optional RMS™ remote monitoring system provides
comprehensive monitoring of loudspeaker parameters from a
Mac® or Windows®-based computer running Compass® Control
Software.

Constructed of premium multi-ply birch, the Acheron Studio
enclosure is coated with a slightly textured black finish. An
optional version of the loudspeaker is available with side rigging
attachment points and the MYA-AST mounting yoke.

FEATURES AND BENEFITS

• High peak power output with ultra-low distortion

• Exceptional fidelity and extended high-frequency performance

• Constant-Q horn that yields uniform response throughout coverage area

• Extraordinarily flat amplitude and phase response for tonal accuracy

• Seamless integration with HMS surround loudspeakers, X-400C and X-800C cinema subwoofers,

and some ULTRA family loudspeakers

APPLICATIONS

• Mid-size theaters

• Custom, private theaters

• Re-recording stages

• Theatrical and home entertainment mix facilities

ACCESSORIES AND ASSOCIATED PRODUCTS

Acheron with MYA-AST Yoke: An optional version of the Acheron Studio with side rigging attachment points and the MYA-AST mounting yoke.

Galileo GALAXY Network Platform: The Galileo GALAXY Network Platform provides state-of-the-art audio control technology for loudspeaker

systems with multiple zones. With immaculate sonic performance, it provides a powerful tool set for corrective room equalization and creative
fine-tuning for a full range of applications.

Acheron with MYA-AST Yoke GALAXY Network Platform

SPECIFICATIONS

ACOUSTICAL

1

COVERAGE

TRANSDUCERS

AUDIO INPUT

Operating Frequency Range237 Hz – 18 kHz

Frequency Response338 Hz – 17 kHz ±4 dB

Phase Response 700 Hz – 17 kHz ±30°

Linear Peak SPL4131.5 dB with crest factor >15 dB (M-noise), 131.5 dB (Pink noise), 133.5 (B-noise)

Horizontal Coverage 80°

Vertical Coverage 50°

Low Frequency One 15-inch cone driver; 2 Ω nominal impedance

High Frequency One 4-inch diaphragm compression driver; 8 Ω nominal impedance

Type Differential, electronically balanced

Maximum Common Mode Range ±15 V DC, clamped to earth for voltage transient protection

Connectors

Input Impedance 10 kΩ differential between pins 2 and 3

Wiring

XLR 3-pin female input with male loop output; optional XLR 5-pin connector to accommodate both
balanced audio and RMS signals.

Pin 1: Chassis/earth through 220 kΩ, 1000 pF, 15 V clamp network to provide virtual ground lift at
audio frequencies

Pin 2: Signal +

5

Pin 3: Signal –

Pin 4: RMS (polarity insensitive)

Pin 5: RMS (polarity insensitive)

Case: Earth ground and chassis

AMPLIFIER

AC POWER

CURRENT DRAW

Maximum Long-Term Continuous Current (>10 sec) 2.2 A rms (115 V AC); 1.1 A rms (230 V AC); 2.5 A rms (100 V AC)

Nominal Input Sensitivity 0 dBV (1.0 V rms) continuous is typically the onset of limiting for noise and music

Input Level

Total Output Power6700 W peak

THD, IM, TIM < 0.02%

Cooling Convection

Connector PowerCON 20 input with loop output

Automatic Voltage Selection 90–265 V AC

Safety Rated Voltage Range 100–240 V AC, 50–60 Hz

Turn-on and Turn-off Points 90 V AC turn-on, no turn-off; internal fuse-protection above 265 V AC

Idle Current 0.340 A rms (115 V AC); 0.227 A rms (230 V AC); 0.387 A rms (100 V AC)

Burst Current (<1 sec)72.9 A rms (115 V AC); 1.5 A rms (230 V AC); 3.3 A rms (100 V AC)

Maximum Instantaneous Peak Current 7.4 A peak (115 V AC); 3.7 A peak (230 V AC); 8.5 A peak (100 V AC)

Inrush Current 11 A peak (115 V AC); 18 A peak (230 V AC); 13 A peak (100 V AC)

Audio source must be capable of producing of +20 dBV (10 V rms) into 600 Ω to produce the
maximum peak SPL over the operating bandwidth of the loudspeaker.

Type Two-channel complementary MOSFET output stages (class AB/bridged)

SPECIFICATIONS, CONT’D.

RMS NETWORK (OPTIONAL)

Two-conductor twisted-pair network that reports all operating parameters of amplifiers to system
operator’s host computer.

PHYSICAL

Dimensions W: 25.38 in (645 mm) x H: 30.78 in (782 mm) x D: 16.00 in (406 mm)

Weight 113 lb (51.26 kg)

Enclosure Premium multi-ply birch with slightly textured black finish

Rigging Optional version available with side rigging attachment points and the MYA-AST mounting yoke.

NOTES

1. Loudspeaker system predictions for coverage and SPL are available in Meyer Sound’s MAPP System Design Tool.

2. Recommended maximum operating frequency range. Response depends on loading conditions and room acoustics.

3. Free-field, measured with 1/3 octave frequency resolution at 4 m.

4. Linear Peak SPL is measured in free-field at 4 m referred to 1 m. Loudspeaker SPL compression measured with M-noise at the onset of limiting,
2-hour duration, and 50 °C ambient temperature is < 2 dB.

M-noise is a full bandwidth (10 Hz–22.5 kHz) test signal developed by Meyer Sound to better measure the loudspeaker’s music performance.
It has a constant instantaneous peak level in octave bands, a crest factor that increases with frequency, and a full bandwidth Peak to RMS ratio
of 18 dB. The presence of a greater-than (>) symbol with regard to crest factor indicates that it may be higher depending on EQ and boundary
loading.

Pink noise is a full bandwidth test signal with Peak to RMS ratio of 12.5 dB.

B-noise is a Meyer Sound test signal used to ensure measurements reflect system behavior when reproducing the most common input spectrum,

and to verify there is still headroom over pink noise.

5. Pins 4 and 5 (RMS) only included with XLR 5-pin connector that accommodates both balanced audio and RMS signals.

6. Peak power based on the maximum unclipped peak voltage the amplifier will produce into the nominal load impedance.

7. AC power cabling must be of sufficient gauge so that under burst current rms conditions, cable transmission losses do not cause the
loudspeaker’s voltage to drop below the specified operating range.

ARCHITECTURAL SPECIFICATIONS

The loudspeaker shall be a self-powered, full-range system; the
transducers shall consist of a 15-inch diameter cone driver and a 4-inch
diaphragm compression driver on an 80° horizontal by 50° vertical horn.
The loudspeaker system shall incorporate internal processing electronics
and a two-channel amplifier, one channel for each driver. Processing
functions shall include frequency and phase correction, signal division, and
protection for the low- and high-frequency sections. The crossover point
shall be 580 Hz.

Each amplifier channel shall be class AB/bridged with complementary
MOSFET output stages. Total burst power shall be 700 watts. Distortion
(THD, IM, TIM) shall not exceed 0.02%. 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 18 kHz; phase
response shall be 700 Hz to 17 kHz ±30°; linear peak SPL shall be

131.5 dB with crest factor > 15 dB, measured with M-noise, free field at

4meters and referred to 1 meter.

The audio input shall be electronically balanced with a 10 kΩ impedance
and accept a nominal 10 dBV (3.2 V rms) signal. Connector shall be XLR

Meyer Sound Laboratories, Inc.
2832 San Pablo Avenue
Berkeley, CA 94702

+1 510 486.1166
meyersound.com/contact
meyersound.com

3-pin female with parallel looping male.

The internal power supply shall perform automatic voltage selection, EMI
filtering, soft current turn-on, and surge suppression. Power requirements
shall be nominal 100, 110, or 230 V AC line current 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 2.9 A at 115 V AC, 1.5 A at 230 V AC and

3.3 A at 100 V AC. Current inrush during soft turn-on shall not exceed 11 A
at 115 V AC, 18 A at 230 V AC, and 13 A at 100 V AC. AC power connector
shall be PowerCON.

The loudspeaker system shall provide facilities for installing Meyer Sound’s
optional RMS remote monitoring system.

All loudspeaker components shall be mounted in an acoustically vented
enclosure constructed of premium multi-ply birch with a slightly textured
black finish. Dimensions shall be W: 25.38 in (645 mm) x H: 30.78 in
(782 mm) x D: 16.00 in (406 mm). Weight shall be 113 lb (51.26 kg).
An optional version of the loudspeaker shall include side rigging attachment
points and the MYA-AST mounting yoke.

The loudspeaker shall be the Meyer Sound Acheron Studio.

Acheron Studio

04.195.004.02 D
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