Datasheet — MM-4XPD
Directional Miniature Self-Powered Loudspeaker
MM-4XPD Loudspeaker and Dimensions
The MM‑4XPD directional miniature self‑powered loudspeaker with IntelligentDC™ technology was specifically designed for high‑quality distributed systems in reverberant spaces. The directional polar pattern of the MM‑4XPD, especially at low frequencies, significantly reduces room excitation and increases intelligibility. Its flexible and easy‑to‑configure mounting options, as well as its ability to effortlessly reproduce both speech and music, make the MM‑4XPD an excellent choice for large distributed systems, theatrical presentations, museums, and small portable systems for corporate audio‑visual, where intelligibility is critical.
The MM‑4XPD meets the same exceptional performance standards as the MM‑4XP with the added advantage of a hypercardioid coverage pattern. Patented technology yields a high degree of attenuation between the front and rear of the loudspeaker, achieving a directional polar response using passive acoustical techniques. Even at low frequencies, the breakthrough technology yields 10 dB of attenuation at the rear of the loudspeaker while retaining directional dispersion at high frequencies.
The MM‑4XPD employs a single‑driver design, avoiding the complexity and cost incurred by directional techniques implemented with two drivers that would require additional amplification and signal processing. Housed in a compact aluminum enclosure, the single 4‑inch cone transducer, designed and manufactured at Meyer Sound’s Berkeley, California factory, delivers an impressive linear peak SPL of 111.5 dB with crest factor >16.5 dB3, and a wide operating frequency range of 120 Hz to 18 kHz with very low distortion. The MM‑4XPD exhibits the same high intelligibility and flat frequency and phase responses for which Meyer Sound loudspeakers are known. Peak and rms limiters regulate loudspeaker temperature and excursion.
The MM‑4XPD receives power and balanced audio from a SwitchCraft® EN3 5‑pin male input connector on its rear panel. The MM‑4XPD’s amplifier and signal‑processing circuits were designed to store DC power and tolerate voltage drops, thereby accommodating light‑gauge cables and long cable runs.
MM‑4XPD loudspeakers require a Meyer Sound external power supply. The MPS‑488HP IntelligentDC power supply is ideal for larger installations with multiple loudspeakers; the single‑space rack‑mount unit distributes DC power and balanced audio to up to eight MM‑4XP loudspeakers or other compatible Meyer Sound low‑voltage loudspeakers. Another option is the 1RU, 1/2 width rack‑mount MPS‑482HP IntelligentDC power supply that offers two channels of audio and DC power.
Meyer Sound’s RMS™ remote monitoring system, which enables comprehensive monitoring of system parameters from a Mac® or Windows®‑based computer, is available as an option for the MPS‑488HP.
Both Meyer Sound power supplies can deliver DC power to MM‑4XPD loudspeakers at cable lengths up to 300 feet with just 1 dB of loss in peak SPL when using 18 AWG wire. The use of composite multiconductor cables (such as Belden® 1502 or equivalent) allows a single cable to carry both DC power and audio to the MM‑4XPD. Longer cable lengths are possible for moderate applications that do not drive the loudspeakers to maximum output, or for installations with heavier gauge wires. Powering the MM‑4XPD from a unipolar external power source reduces induced noise significantly and eliminates the need for wiring conduits. For information about, and specifications for, the Meyer Sound power supplies, see meyersound.com/product/mps.
The MM‑4XPD’s extruded aluminum enclosure acts as a heat sink to dissipate heat from the driver’s voice coil. The enclosure is available in a standard black anodized finish with a perforated steel grille. The enclosure can also be custom painted to match specific color schemes. The optional MUB‑MM4XPD U‑bracket facilitates mounting of the loudspeaker on walls and ceilings at adjustable angles.
Features and Benefits
Directional hypercardioid pattern provides 10 dB of attenuation between the front and rear of the loudspeaker, even at low frequencies
Directional pattern reduces room excitation, desirable in highly reverberant spaces
Extremely compact size fits in small spaces
Patented, passive, single‑driver directional technology minimizes energy consumption, weight, and cabinet volume
Convenient U‑bracket enables quick and easy mounting
Applications
Restaurants, bars, and highly reverberant public spaces
Large distributed systems
Trade show presentations
Accesories and Associated Products
MUB-MM4XP Mounting U-Bracket — Allows the MM‑4XP to be mounted on any flat surface at adjustable angles (includes mounting hardware).
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MUB-MM4XP Mounting U-Bracket
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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.
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GALAXY Network Platform
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MPS-488HP External Power Supply — Rack‑mount unit that delivers balanced audio and high‑current DC power to up to eight loudspeakers; versions available with either Phoenix or EN3 channel output connectors.
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MPS-488HP External Power Supply
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MPS-482HP External Power Supply — 1RU 1/2‑width rack unit that delivers balanced audio and high‑current DC power to up to two audio channels; optional accessories for rack, wall, ceiling, pole, or truss mounting.
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MPS-482HP External Power Supply
Specifications
ACOUSTICAL | |
Operating Frequency Range1 | 120 Hz – 18 kHz |
Frequency Response2 | 135 Hz – 17 kHz ±4 dB |
Phase Response | 330 Hz – 20 kHz ±45° |
Linear Peak SPL3 | 111.5 dB (M-noise) with crest factor >16.5 dB, 109 dB (Pink noise), 111 dB (B‑noise) |
COVERAGE | |
Hypercardioid response with <10 dB front‑to‑back ratio up to 500 Hz 120° (500 Hz – 4 kHz); 80° (4 kHz – 10 kHz ±10°) | |
TRANSDUCERS | |
One 4‑inch cone driver; 4 Ω nominal impedance | |
AUDIO INPUT | |
Type | Differential, electronically balanced |
Maximum Common Mode Range | ±5 V DC |
Connectors | SwitchCraft EN3 5‑pin male ( two pins for 48 V DC power, three pins for balanced audio) |
Input Impedance | 10 kΩ electronically balanced |
Wiring | Pin 1: DC power (–) Pin 2: DC power (+) Pin 3: Audio shield, chassis/earth Pin 4: Audio (–) Pin 5: Audio (+) |
Nominal Input Sensitivity | –2.5 dBV (0.75 V rms) continuous average is typically the onset of limiting for noise and music |
Input Level | Audio source must be capable of producing +16 dBV (6.3 V rms) into 600 Ω to produce maximum peak SPL over the operating bandwidth of the loudspeaker |
AMPLIFIER | |
Type | Class‑D |
Total Output Power4 | 440 W peak |
THD, IM, TIM | < 0.02% |
Cooling | Convection |
DC POWER5 | |
Connector | SwitchCraft EN3 5‑pin male (two pins for 48 V DC power, three pins for balanced audio) |
Safety Agency Rated Voltage Range6 | 48 V DC |
CURRENT DRAW | |
Idle Current | 0.16 A rms |
Maximum Long‑Term Continuous Current (>10 sec) | 0.7 A rms |
Burst Current (<1 sec) | 2.2 A rms |
Maximum Instantaneous Peak Current | 2.35 A peak |
Inrush Current | <7.0 A peak |
PHYSICAL | |
Dimensions | W: 4.04 in (103 mm) x H: 4.04 in (103 mm) x D: 7.95 in (202 mm) D with connector: 10.20 in (259 mm) |
Weight | 5.2 lb (2.4 kg) |
Enclosure | Extruded aluminum with black anodized finish |
Protective Grille | Perforated steel |
Mounting | Two 3/8 inch‑16 side inserts; optional MUB‑MM4XPD U‑bracket |
Notes
Recommended maximum operating frequency range. Response depends on loading conditions and room acoustics.
Free‑field, measured with 1/3 octave frequency resolution at 4 m.
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 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.
Peak power based on the maximum unclipped peak voltage the amplifier will produce into the nominal load impedance.
Requires Meyer Sound IntelligentDC Power Supply. For information and specifications, visit meyersound.com/product/mps/.
Tolerates voltage drops up to 30% due to long cable runs.
Architectural Specifications
The loudspeaker shall be self‑powered and include a single 4‑inch (103 mm) diameter cone transducer with a 4 Ω, long‑excursion voice coil. The loudspeaker shall incorporate a class‑D power amplifier with a burst capability of 440 W peak into a nominal load of 4 Ω. Distortion (THD, IM, TIM) shall not exceed 0.02 percent.
Performance specifications for a typical production unit shall be as follows, measured at 1/3‑octave resolution: operating frequency range, 120 Hz to 18 kHz; phase response, 330 Hz to 20 kHz ±45°; linear peak SPL shall be 111.5 dB with crest factor >16.5 dB measured with M‑noise, free field at 4 m referred to 1 m. Horizontal and vertical coverage shall be hypercardioid with a <10 dB front‑to‑back ratio up to 500 Hz, 120° at 500 Hz to 4 kHz, and 80° at 4 kHz to 10 kHz ±10°.
The loudspeaker shall be equipped with a single SwitchCraft EN3 5‑pin connector (two pins for DC power, three pins for balanced audio). The audio input shall be electronically balanced with a 10 kΩ impedance and accept a nominal –2.5 dBV (0.75 V rms) input signal.
Power requirements for the loudspeaker shall be an external Meyer Sound IntelligentDC power supply. Current draw for the loudspeaker during burst (<1 sec) shall be 2.2 A rms at 48 V. Current inrush during turn‑on shall not exceed 7.0 A peak at 48 V.
Loudspeaker components shall be housed in a sealed, extruded aluminum enclosure with a black anodized finish. Custom painted colors shall be optionally available. Dimensions with grille frame shall be W: 4.04 in (103 mm) x H: 4.04 in (103 mm) x D: 7.95 in (202 mm) D with connector: 10.20 in (259 mm). Weight shall be 5.2 lb (2.4 kg). 3/8 inch‑16 inserts on each side of the enclosure shall accommodate Meyer Sound mounting and rigging options.
The loudspeaker shall be the Meyer Sound MM‑4XPD.