Meyer Sound Documentation

All components in an audio system (self-powered loudspeakers, mixing consoles, and processors) must be properly connected to an AC power distribution system, ensuring that AC line polarity is preserved and that all grounding points are connected to a single node or common point using the same cable gauge (or larger) as the neutral and line cables.

120V AC, 3-Phase Wye System (Single Line)

Line-Neutral-Earth/Ground

The figure below illustrates a basic 120 V AC, 3-phase Wye distribution system with the loudspeaker load distributed across all three phases and with each loudspeaker connected to a single line and common neutral and earth/ground lines. This system delivers 120 V AC to each loudspeaker.

120 V AC, 3-Phase Wye System (Single Line to Loudspeakers)

120V AC, 3-Phase Wye System (Two Lines)

Line-Line-Earth/Ground

The figure below illustrates a 120 V AC, 3-phase Wye distribution system with each loudspeaker connected to two lines and a common earth/ground line. This configuration is possible because the UPQ-D Series tolerate elevated voltages from the ground line and does not require a neutral line. This system delivers 208 V AC to each loudspeaker.

120 V AC, 3-Phase Wye System (Two Lines to Loudspeakers)

Tip

The 120 V AC, 3-phase Wye system with two lines is recommended because it allows loudspeakers to draw less current than with single-line systems, thereby reducing voltage drop due to cable resistance. It also excludes the potential of varying ground to neutral voltages producing an audible hum.

230V AC, 3-Phase Wye System (Single Line)

Line-Neutral-Earth/Ground

Figure 5 illustrates a basic 230 V AC, 3-phase Wye distribution system with the loudspeaker load distributed across all three phases and with each loudspeaker connected to a single line and common neutral and earth/ ground lines. This system delivers 230 V AC to each loudspeaker.

230 V AC, 3-Phase Wye System (Single Line to Loudspeakers)

Caution

For 230 V AC, 3-phase Wye systems, never connect two lines to the AC input of a UPQ-D Series loudspeaker, as the resulting voltage would exceed the upper voltage limit (275 V AC) and will damage the loudspeaker.

The MJF-208 and MJF-210 user panels include two powerCON 20 connectors, one for AC Input (blue) and one for AC Loop Output (gray), as shown in the figure below.

AC Input (Left) and AC Loop Output (Right) Connectors

AC Input Connector (Blue)

The blue AC Input connector supplies power to the loudspeaker. The connector is rated at 20 amps and uses a powerCON 20 AC mains locking connector that prevents accidental disconnections. A 10-foot AC power cable, rated at 15 amps, is included with each loudspeaker. If the included AC power cable is replaced, make sure to use a cable with the appropriate power plug (on the other end) for the region where the unit will be operated. The MJF-208 and MJF-210 require a grounded outlet. To operate safely and effectively, it is extremely important that the entire system be properly grounded.

The AC Input connector also supplies power to any additional loudspeakers connected to the loudspeaker’s gray Loop Output connector.

Table 1. Maximum Looped Number of MJF-210s with AC Power

Circuit Breaker/ Connector Ratings	115 V AC	230 V AC	100 V AC
15 amps	6 looped (7 total)	11 looped (12 total)	4 looped (5 total)
20 amps	9 looped (10 total)	15 looped (16 total)	5 looped (6 total)

Current draw for the MJF-208 and MJF-210 is dynamic and fluctuates as operating levels change.

The number of loudspeakers that can be looped assumes that operating levels are normal and not such that loudspeakers are constantly limiting.

Each MJF-208/MJF-210 ships with one AC looping connector for making AC looping cables. Assembled

1. meter AC looping cables (PN 28.115.032.03) are also available from Meyer Sound.

AC Loop Output Connector (Gray)

The gray AC Loop Output connector allows multiple MJF-208 or MJF-210s to be looped and powered from a single power source. The three-conductor powerCON 20 is rated at 20 A and uses a locking connector that prevents accidental disconnections. For applications that require multiple MJF-208 or MJF-210, connect the AC Loop Output of the first loudspeaker to the AC Input of the second loudspeaker, and so forth.

The maximum number of loudspeakers that can be looped from the Loop Output connector is determined by the voltage of the power source, the current draw of the looped loudspeakers, the circuit breaker rating, and the rating of the AC power cable connected to the first loudspeaker.

Table 2. Maximum Looped Number of MJF-208s with AC Power

Circuit Breaker/ Connector Ratings	115 V AC	230 V AC	100 V AC
15 amps	8 looped (9 total)	15 looped (16 total)	6 looped (7 total)
20 amps	11 looped (12 total)	21 looped (22 total)	9 looped (10 total)

Table 3. Maximum Looped Number of MJF-210s with AC Power

Circuit Breaker/ Connector Ratings	115 V AC	230 V AC	100 V AC
15 amps	20 amps (9 total)	11 looped (12 total)	4 looped (5 total)
20 amps	9 looped (10 total)	15 looped (16 total)	5 looped (6 total)

Note

Current draw for the MJF-208 and MJF-210 is dynamic and fluctuates as operating levels change. The number of loudspeakers that can be looped assumes that operating levels are normal and not such that loudspeakers are constantly limiting.

Each MJF-208/MJF-210 ships with one AC looping connector for making AC looping cables. Assembled 1-meter AC looping cables (PN 28.115.032.03) are also available from Meyer Sound.

The pins on the powerCON 20 cable mount connector are labeled as follows:

powerCON 20 Cable Mount Connector

How AC power cables are wired is determined by the type of AC power distribution system used (see AC Power Distribution). When wiring AC power cables for single-line systems, use one of the following wiring schemes:

The MJF-208 and MJF-210 operate as intended when receiving AC voltage within the following range:

If the voltage drops below 90 V, the loudspeaker uses stored power to continue operating temporarily; the loudspeaker powers off if the voltage does not return to its operating range.

If the voltage rises above 275 V, the power supply could become damaged.

powerCON 20 Cable Mount Connector

How AC power cables are wired is determined by the type of AC power distribution system used (see “AC Power Distribution” on page 3). When wiring AC power cables for single-line systems, use one of the wiring schemes shown in Figure 6 and described in Table 1:

The MJF-208/MJF-210 loudspeaker current draw is dynamic and fluctuates as operating levels change. Because different cables and circuit breakers heat up at varying rates, it is important to understand the following types of current ratings and how they affect circuit breaker and cable specifications.

Use the information in the table below as a guideline for selecting cable gauge and circuit breaker ratings for the system’s operating voltage.

The minimum electrical service amperage required by an MJF-208 or MJF-210 loudspeaker system is the sum of the Maximum Long-Term Continuous Current for each loudspeaker. An additional 30 percent above the minimum amperage is recommended to prevent peak voltage drops at the service entry.

The MJF-208/MJF-210 Intelligent AC™ power supply automatically selects the correct operating voltage (allowing the loudspeaker to be used internationally without manually setting voltage switches), eliminates high inrush currents with soft-start power up, suppresses high-voltage transients up to several kilovolts, filters common mode and differential mode radio frequencies (EMI), and sustains operation temporarily during low-voltage periods.

Powering Up the MJF-208 or MJF-210

When powering up the MJF-208/MJF-210, the following startup events take place over several seconds.

1. Audio output is muted.

2. Voltage is detected and the power supply mode is automatically adjusted as necessary. The power supply ramps up.

3. During the power up sequence, the On/Status LED flashes multiple colors successively.

4. After the power up sequence and system check have completed, the ON/Status LED turns solid green, indicating the loudspeaker is ready to reproduce audio.

Caution

If the On/Status LED does not turn green, or the MJF-208/MJF-210 does not output audio after ten seconds, remove AC power immediately and verify that the voltage is within the required range. If the problem persists, contact Meyer Sound Technical Support.

Make sure to observe the following important electrical and safety guidelines.

The MJF-208/MJF-210 comes standard with 3-pin XLR connectors for audio Input and audio Loop output. The 5-pin XLR connectors are optionally available.

MJF-208/MJF-210 XLR Audio Connectors, Input and Loop Output

Input Connector (XLR 3-Pin Female)

The audio Input is an 3-pin XLR female connector and accepts balanced audio signals with an input impedance of 10 kΩ. The connector uses the following wiring:

• Pin 1 — 1 kΩ to chassis and earth ground (ESD clamped)

• Pin 2 — Signal (+)

• Pin 3 — Signal (–)

• Case — Earth (AC) ground and chassis

Pins 2 and 3 carry the input as a differential signal. Pin 1 is connected to earth through a 1 kΩ, 1000 pF, 15 V clamped network. This circuitry provides virtual ground lift for audio frequencies while allowing unwanted signals to bleed to ground. Make sure to use standard, balanced XLR audio cables with pins 1–3 connected on both ends. Telescopic grounding is not recommended, and shorting an input connector pin to the case may cause a ground loop, resulting in hum.

Tip

If unwanted noise or hiss is produced by the loudspeaker, disconnect its input cable. If the noise stops, there is most likely nothing wrong with the loudspeaker. To locate the source of the noise, check the audio cable, source audio, and AC power.

Loop Output Connector (3-Pin XLR Male)

The audio Loop output is a 3-pin XLR male connector. It allows loudspeakers to be looped from a single audio source. For applications that require multiple MJF-208/ MJF-210s, connect the Loop output of the first unit to the Input of the second, and so forth.

Note

The Loop connector is wired in parallel to the Input connector and transmits the unbuffered source signal even when the MJF-208/ MJF-210 is powered off.

To avoid distortion when looping multiple MJF-208/

MJF-210s, make sure the source device can drive the total load impedance of the looped loudspeakers. In addition, the source device must be capable of delivering approximately 20 dBV (10 V rms into 600 Ω) to yield the maximum peak SPL over the entire operating bandwidth of the loudspeakers. Most professional audio equipment can transmit these source levels.

To calculate the load impedance for the looped loudspeakers, divide 10 kΩ (the input impedance for a single MJF-208/MJF-210) by the number of looped loudspeakers. For example, the load impedance for ten MJF-208/MJF-210 loudspeakers is 1000 Ω (10 kΩ / 10). To drive this number of looped loudspeakers, the source device should have an output impedance of 100 Ω or less. This same rule applies when looping MJF-208/MJF-210 loudspeakers with other self-powered Meyer Sound loudspeakers.

Note

Most source devices are capable of driving loads no smaller than 10 times their output impedance.

Caution

Make sure that all cabling for looped loudspeakers is wired correctly (Pin 1 to Pin 1, Pin 2 to Pin 2, and so forth) to prevent the polarity from being reversed. If one or more loudspeakers in a system have reversed polarity, frequency- quency response and coverage will be significantly degraded.

Optional 5-pin XLR Audio Connectors

The MJF-208/MJF-210 is optionally available with 5-pin XLR connectors for audio Input and audio Loop output. The connectors accept balanced audio signals with an input impedance of 10 kΩ and use the following wiring:

MJF-208/MJF-210 5-Pin XLR Connectors, Input and Loop Output

• Pin 1 — 1 kΩ to chassis and earth ground (ESD clamped)

• Pin 2 — Signal (+)

• Pin 3 — Signal (–)

• Pin 4 — RMS (polarity insensitive)

• Pin 5 — RMS (polarity insensitive)

• Case — Earth (AC) ground and chassis

Pins 2 and 3 carry the input as a differential signal. Pin 1 is connected to earth through a 1 kΩ, 1000 pF, 15 V clamped network. This circuitry provides virtual ground lift for audio frequencies while allowing unwanted signals to bleed to ground. Make sure to use cables that have pins 1–3 connected on both ends. Telescopic grounding is not recommended, and shorting an input connector pin to the case may cause a ground loop, resulting in hum.

When source levels for the MJF-208/MJF-210 exceed optimum input levels for its drivers, limiting is engaged and is indicated by the two Limit LEDs on the user panel. The bottom LED indicates limiting for the low-frequency channels. The top LED indicates limiting for the high-frequency channel. When engaged, limiting not only protects the drivers, but also prevents signal peaks from causing excessive distortion in the amplifier’s channels, thereby preserving headroom and maintaining smooth frequency responses at high levels. When source levels return to normal, below the limiter’s threshold, limiting ceases.

Limit LEDs

The MJF-208/MJF-210 performs within its acoustical specifications at normal temperatures when the Limit LEDs are unlit, or if the LEDs are lit for 2 seconds or less and then turn off for at least 1 second. If an LED remains lit for longer than 3 seconds, the loudspeaker enters hard limiting where:

During normal operation, the MJF-208/MJF-210’s On/Status LED is green. If the loudspeaker’s internal temperature reaches 75° C (167° F), the LED turns solid yellow and the loudspeaker’s gain is reduced by 3 dB. Although the MJF-208/MJF-210 will continue to operate normally with the lower gain, the On/Status LED illuminating yellow indicates that the loudspeaker is reaching its maximum heat dissipation and a reduction in SPL is recommended. When the loudspeaker’s internal temperature cools to 60° C (140° F), the amplifier returns to normal operation.

The MJF-208/MJF-210 amplifier relies solely on natural convection for cooling from air flowing over its heat sink. The efficient amplifier and heat sink design keeps temperatures low, even when the unit is operated at high ambient temperatures, in tightly packed configurations, and driven continuously at high output levels.

The MJF-208/MJF-210 loudspeaker optionally includes an RMS remote monitoring system module, allowing them to be connected to an RMS network. RMS reports, in real-time, the status and power usage of multiple Meyer Sound loudspeakers from a Mac® or Windows®-based computer. The RMServer™ communicates with Meyer Sound loudspeakers equipped with RMS modules. RMServer is a compact, Ethernet-based hardware unit with two FT-10 RMS data ports. RMServer stores system configurations internally, eliminating most manual data entry. Systems can be monitored from a computer at front-of-house or backstage, or from a laptop anywhere within the venue over WiFi.

The MAPP System Design Tool is a powerful, cross-platform application for accurately predicting the coverage pattern, frequency response, phase response, impulse response, and SPL capability of individual or arrayed Meyer Sound loudspeakers.

MAPP System Design Tool

Whether planning for fixed installations or for tours with multiple venues, use MAPP to accurately predict the appropriate loudspeaker deployment for each job, complete with coverage data, system delay and equalization settings, rigging information, and detailed design illustrations. MAPP’s accurate, high-resolution predictions ensure that systems will perform as intended, thereby eliminating unexpected coverage problems and minimizing onsite adjustments.

The key to the accuracy of MAPP’s predictions is MeyerSound’s exhaustive database of loudspeaker measurements. Performance predictions for each loudspeaker are based on 3-dimensional, 65,000+ 1/48th-octave-band measurements taken in the MeyerSound anechoic chamber. The extraordinary consistency between Meyer Sound loudspeakers guarantees that predictions from MAPP will closely match their actual performance.

MAPP software allows for configuration of MeyerSound loudspeaker systems and definition of the environment in which they operate, including air temperature, pressure, humidity, and the location of prediction surfaces. Importing both CAD (.DXF) and Sketchup (.SKP) files containing detailed venue information to act as an anchor model to the prediction surfaces and a visual aid to facilitate prediction data interpretation is also possible.

MAPP Capabilities

With MAPP, you can:

• Simulate different loudspeaker configurations to refine system designs and determine the best coverage for intended audience areas

• Model loudspeaker interactions to locate constructive and destructive interferences so that loudspeakers can be re-aimed and repositioned as necessary

• Place microphones anywhere in the Model View space and predict loudspeaker frequency response, phase response, and sound pressure levels at each microphone position

• Determine delay settings for fill loudspeakers using the Inverse Fast Fourier Transform and phase response feature

• Preview the results of signal processing to determine optimum settings for the best system response

• Automatically calculate load information for arrays to determine necessary minimum rigging capacity, front-to-back weight distribution, and center of gravity location

• Generate and export system images and system PDF reports for client presentations

• Synchronize GALAXY processor output channel settings in real-time with virtual or real GALAXY units, allowing in-the-field changes to be predicted during system alignments.

The Galileo GALAXY Network Platform is a sophisticated loudspeaker management tool for controlling all MeyerSound speaker types. The GALAXY loudspeaker processor extends a high level of audio control in driving and aligning loudspeaker systems with multiple zones. It provides a powerful tool set for corrective equalization (EQ) and creative fine-tuning for a full range of applications from touring to cinema.

Users can readily program the GALAXY processor using Compass software running on a host computer or via the Compass Go application for the iPad. Connecting MAPP to the GALAXY processor will also allow the user to push output channel settings created in MAPP as a starting point. Compass Control Software includes custom-designed settings for each family of speakers, as well as to integrate families together. For example, the Product Integration feature matches the phase characteristics between Meyer speaker families to ensure the most coherent summation.

Processing tools for inputs and outputs include delay, parametric EQ and U-Shaping EQ. Output processing also includes polarity reversal, Low-Mid Beam Control (LMBC), atmospheric correction, and All Pass filters.

The built-in summing and delay matrices allow a user to easily assign gain and delay values, respectively, at each cross point. This capability greatly facilitates using one loudspeaker to satisfy multiple purposes.

Front panel controls let a user intuitively and quickly operate a GALAXY processor without a computer during live use.

The GALAXY 408, GALAXY 816 and GALAXY 816-AES3 processor versions have the same audio processing capability with different I/O. See www.meyersound.com to locate their datasheets for more information.