Meyer Sound Documentation

All components in an audio system (self-powered loudspeakers, processors, etc.) 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 as the neutral and line cables.

The figure below illustrates a basic three-phase AC distribution system with the loudspeaker load distributed across the three phases. All loudspeakers are connected to common neutral and earth-ground points.

Figure 1: AC Power Distribution System

The figure below shows the user panel on the back of the JM-1P includes PowerCON AC connectors.

Figure 2: JM-1P AC Input (left) and AC Loop Output (right) Connectors

AC Input Connector (Blue)

The blue AC Input connector supplies power to the JM-1P. The connector is rated at 20 amps and uses a PowerCon AC mains locking connector that prevents accidental disconnections. A 10-foot AC power cable, rated at 15 amps, is included with each loudspeaker. If you replace the included AC power cable, make sure to use a cable with the appropriate power plug (on the other end) for the area in which you will operate the unit.

The AC Input connector also supplies power to any additional loudspeakers connected to the loudspeaker’s gray Loop Output connector. Each JM-1P loudspeaker requires approximately 5 A rms (maximum long-term continuous current) at 115 V AC for proper operation.

Caution

When using the included AC power cable, do not loop more than two additional JM-1P loudspeakers from the AC Loop Output connector at 115 V (three total for the circuit), and not more than five at 230 V (six total for the circuit).

AC Loop Output Connector (Gray)

The gray AC Loop Output connector allows multiple JM-1P loudspeakers to be looped and powered from a single power source. Connect the AC Loop Output of the first loudspeaker to the AC Input of the second, and so forth. The AC Loop Output uses a PowerCon3 AC mains locking connector that prevents accidental disconnections.

The maximum number of loudspeakers that can be looped from the Loop Output connector is determined by the voltage of the power source, the circuit breaker rating, and the rating of the AC power cable connected to the first JM-1P loudspeaker.

Table 1. Number of JM-1Ps that Can Be Looped with AC Power

Circuit Breaker/ Connector Rating	115 V AC	230 V AC	100 V AC
15 amps	2 looped (3 total)	5 looped (6 total)	1 looped (2 total)
20 amps	3 looped (4 total)	7 looped (8 total)	2 looped (3 total)

Each JM-1P loudspeaker ships with one AC looping connector for making AC looping cables. Assembled AC looping cables are available from Meyer Sound (15-inch UL AC looping cable, PN 28.115.032.01; 0.35 m CE AC looping cable, PN 28.115.032.02).

Caution

Do not exceed the current capability of the 20-amp Input connector for the JM-1P loudspeakers. When looping loudspeakers, consider the total current draw for all loudspeakers on the circuit, including the first loudspeaker.

The JM-1P requires a grounded outlet. To operate safely and effectively, it is extremely important that the entire system be properly grounded.

Figure 3: AC Cable Wiring Scheme

When wiring international or special-purpose power connectors:

The JM-1P operates safely and continuously when the AC voltage stays within 95–125 V AC and 208–235 V AC at 50 or 60 Hz. The JM-1P allows any combination of voltage to GND (neutral-line-ground or line-line-ground).

If the voltage drops below 85 V (brownout), the JM-1P uses stored power to continue operating temporarily; the loudspeaker will shut down if the voltage does not rise above the low boundary before the stored power is used.

If the voltage rises above 235 V, the power supply could become damaged.

Powering Up the JM-1P

When AC power is applied to the JM-1P, its Intelligent AC™ power supply automatically selects the correct operating voltage, allowing it to be used internationally without manually setting voltage switches. In addition, Intelligent AC also 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.

When powering up the JM-1P, 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.

3. The power supply ramps up.

4. The green On/Temp LED on the user panel lights up, indicating the loudspeaker is ready to output audio.

Note

The fan remains off at turn-on. It is controlled by audio level and operates only at high audio levels.

Caution

• If the On/Temp LED does not light up, or the loudspeaker 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.

• If either of the loudspeaker’s circuit breakers trip (the white center buttons disengage), do NOT reset and reapply power. Instead, disconnect from AC power and contact the Meyer Sound Service Department for instructions on how to proceed.

The current draw for the JM-1P is dynamic and fluctuates as operating levels change. Since 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 table below as a guide for selecting cable gauges and circuit breaker ratings for the system’s operating voltage.

The minimum electrical service amperage required by a JM-1P 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.

Pay close attention to these important electrical and safety issues.

The Looping Audio Input module includes input and looping connectors, and LEDs for monitoring temperature and limiting.

Figure 4: Looping Audio Input Module

Loop Connector

The male XLR Loop connector allows multiple JM-1P loudspeakers to be looped from a single audio source. Connect the Loop output of the first loudspeaker to the Input of the second, and so forth. The Loop connector is wired in parallel to the Input connector and transmits the unbuffered source signal even when the loudspeaker is powered off.

To avoid distortion when looping multiple JM-1P loudspeakers, 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 20 dBV (10 V rms into 600 ohms) to yield the maximum peak SPL over the operating bandwidth of the loudspeaker.

To calculate the load impedance for the looped loudspeakers, divide 10 kOhms (the input impedance for a single JM-1P) by the number of looped loudspeakers. For example, the load impedance for 10 JM-1P loudspeakers is 1000 ohms (10 kOhms / 10). To drive this number of looped loudspeakers, the source device should have an output impedance of 100 ohms or less. This same rule applies when looping JM-1P loudspeakers with other self-powered Meyer Sound loudspeakers and subwoofers.

Note

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

• 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 response and coverage can be significantly degraded.

Limit LEDs

The low- and high-frequency drivers for the JM-1P are powered by separate amplifier channels, each with their own limiter. Limiting activity is indicated with the two yellow Limit LEDs. The top LED indicates limiting for the high-frequency channel and the bottom LED indicates limiting for the low-frequency channel. When engaged, a channel’s limiter not only protects the driver, but also prevents signal peaks from causing excessive distortion in the amplifier’s channel, thereby preserving headroom and maintaining smooth frequency responses at high levels. When a channel’s level returns to normal, below the limiter’s threshold, limiting ceases.

Figure 5: Limit LEDs

The JM-1P performs within its acoustical specifications at normal temperatures when the Limit LEDs are unlit, or if the LEDs are lit for two seconds or less and then turn off for at least one second. If an LED remains lit for longer than three seconds, that channel enters hard limiting where:

• Increases to the input level have no effect.

• Distortion increases due to clipping and nonlinear driver operation.

• The driver is subjected to excessive heat and excursion, which will compromise its life span and may eventually lead to damage over time.

Caution

The Limit LEDs indicate when a safe, optimum level is exceeded. If a JM-1P loudspeaker begins to limit before reaching the required SPL, consider adding more loudspeakers to the system.

Note

The JM-1P loudspeaker uses optical limiters that add no noise and have no effect on the signal when the limiters are not engaged and the Limit LEDs are not lit.

On/Temp LED

When the JM-1P is powered on, its On/Temp LED turns green. If the temperature of the heat sink reaches 85° C (185° F), the On/Temp LED changes from green to red and the limiter threshold is lowered to a safe level to prevent the system from overheating. Under high temperature conditions the output level is reduced by approximately 6 dB.

When the heat sink temperature decreases to 80° C (176° F), the On/Temp LED changes from red back to green and the limiter threshold returns to normal.

Note

When the On/Temp LED is red, this is an indication that the unit is reaching its maximum dissipation and a reduction in SPL is recommended.

Tip

When the JM-1P is connected to an RMS network, the RMS software provides additional feedback on the loudspeaker’s operating temperature. For more information, see “RMS Remote Monitoring System” on pa

The amplifier for JM-1P uses natural convection for cooling at low to moderate audio levels; for high audio levels, it uses Meyer Sound’s proprietary QuietCool fan technology to prevent overheating. The QuietCool™ fan only engages at high audio levels, making it virtually inaudible.

Full-range signals can be connected directly to Meyer Sound self-powered loudspeakers because the loudspeakers have built-in active crossovers. External crossovers and digital signal processors are optional and should be used with caution as they can introduce phase shifts that cause destructive cancellations.

If a digital signal processor is used, both the JM-1P loudspeakers and subwoofer should be driven from the same processor to keep their delay times the same.

Otherwise, a phase shift between the JM-1Ps and subwoofer may be encountered. In addition, you should verify the delay time between channels: some digital signal processors may incur channel-to-channel delays when the processor is near maximum throughput, which becomes more likely as the number of filters in use by the processor is increased.

Third-order filters (and higher) are not recommended. If they must be used, they should be used cautiously, since they may cause phase shifts that deteriorate the impulse response; in addition, their higher roll-off may also interfere with crossover interaction.

The JM-1P loudspeaker is compatible with Meyer Sound’s QuickFly system, a comprehensive collection of custom-designed rigging, flying, and mounting options. Comprised of rugged, reliable, and easy-to-configure components, QuickFly lets you deploy JM-1P loudspeakers as arrays at precise angles to take full advantage of their directional components. The top and bottom plates for the JM-1P cabinets are constructed of heavy-duty, high-strength, corrosion-resistant 6061-T6 aluminum and include threaded metric holes (for M10 screws) for easy connection to QuickFly rigging and third-party mounting options.

The JM-1P is equipped with GuideALinks on its four right corners that attach to an adjacent JM-1P with the links inserted in the left corner slots of the linked unit. GuideALinks are extended and retracted with front and rear knobs. The links are secured to the linked JM-1P with the quick-release pins included with each loudspeaker. GuideALinks are also used when flying JM-1Ps from the MTG-JM1 vertical grid.

Figure 6: JM-1P GuideALinks

JM-1P Quick-Release Pins

Each JM-1P ships with four quick-release pins that secure the units when they are linked. When inserting and removing the pins, press the button at the top of the pin to disengage it. When inserted in the GuideALink holes (in the front left corners and rear right corners), the pins latch and lock to the links inserted into the corner slots.

Figure 7: Rear Quick-Release Pin, GuideALink Inserted (Left); GuideALink Not Present (Right)

When the GuideALinks are not present in the corner slots, the quick-release pins should be removed from the corner link holes and placed in their stowed location: in the front, just to the left of the top and bottom GuideALink knobs; and in the rear, in the top and bottom center holes.

Figure 8: Stowed Quick-Release Pin, Front Bottom

Figure 9: Stowed Quick-Release Pin, Rear Bottom

Linking JM-1Ps

Procedure. To link JM-1Ps:

1. Place the JM-1Ps next to each other on a flat surface and align the adjacent back corners so they are as close as possible to each other.\

   Figure 10: Linking JM-1P Loudspeakers

2. Face the rear of the loudspeakers and slide the top and bottom rear GuideALink knobs to the left to insert the links into the corner slots of the adjacent loudspeaker.

   Figure 11: Inserting Rear GuideALinks

3. Secure the rear GuideALinks with the quick-release pins stored at the center top and center bottom of the loudspeaker. The pins can be inserted top down or bottom up.

4. Face the front of the loudspeakers and position the loudspeakers so their adjacent front corners are as close as possible to each other. The previously attached rear GuideALinks act as a hinge.

5. Slide the top and bottom front GuideALink knobs to the right to insert the links into the corner slots of the adjacent loudspeaker.

6. Secure the front GuideALinks with the quick-release pins stored at the right top and right bottom of the loudspeaker. The pins are inserted from the front, as shown in the figure below.

   Figure 12: Inserting Front GuideAlinks

   Caution

   Routine maintenance inspections of the JM-1P should include a check of all GuideALink knobs. Rotate each knob counterclockwise to make sure they are tight. If a knob turns, reset it in the link with Loctite® 290 and let it cure for 48 hours. Retest the link before the unit is flown.

A single MPA-JM1P pickup plate can suspend arrays of 2–4 loudspeakers:

Two MPA-JM1 pickup plates can suspend arrays of 4–6 loudspeakers:

MTGSB-4B Spreader Bar

The optional MTGSB-4B spreader bar can suspend two MPA-JM1P pickup plates from a single motor point. Six hanging points are provided at each end of the spreader bar to adjust the spread between the pickup plates. The MTGSB-B spreader bar includes shackles and connecting links.

Figure 21: Two MPA-JM1 Pickup Plates with Five JM-1Ps Suspended from the MGTSB-4B Spreader Bar Using 3rd Spreader Bar Hole and 7th MPA-JM1 Pickup Plate Hole

The uptilt and downtilt angles achievable with the JM-1P are determined by the number of pickup points, the MPA-JM1 pickup hole(s) used and the vertical orientation of the loudspeaker (horn on top or “up” versus horn on bottom or “down”— see the figure below). These angles differ also depending on the number of loudspeakers suspended and the number of MPA-JM1 pickup plates required to suspend them. Table Resulting Angles using Single Pickup Point, below, provides a list of resulting angles using a single pickup point. Table Resulting Angles using Two Pickup Points, provides a list of resulting angles using two pickup points. Table Using the Spreader Bar and a Single Pickup Point, provides a list of resulting angles using the MGTSB-4B Spreader Bar and a single pickup point.

Figure 22: Horn Up (left), Horn Down (right)

The optional MTG-JM1 vertical grid suspends JM-1P vertical arrays of up to six units. The grid was designed specifically for the JM-1P and is compatible with the GuideALinks and quick-release pins included with the JM-1P.

The MTG-JM1 vertical grid has a row of nine hanging points in the center of the grid. Two additional attachment points are located at the left and right rear corners of the grid to provide additional control and stability.

Figure 23: MTG-JM1 Vertical Grid Dimensions; Weight, 47 lbs (21.32 kg)

The MTG-JM1 vertical grid comes with four quick-release pins for securing the JM-1P connected directly to the grid. To secure the front GuideALinks, the quick-release pins are inserted at the front of the grid. To secure the rear GuideALinks, the pins are inserted from the inside of the grid. Additional JM-1Ps in the array are secured with the quick-release pins included with each loudspeaker.

Figure 24: MTG-JM1 Vertical Grid with JM-1P

The MTG-JM1 vertical grid has a row of nine hanging points in the center of the grid. Two additional attachment points are located at the left and right rear corners of the grid to provide additional control and stability

Figure 25: MTG-JM1 Vertical Grid with Three JM-1Ps

Rotating the Meyer Sound Logo

To accommodate the orientation of the JM-1P, the Meyer Sound logo on the unit’s grille frame can be rotated.

To rotate the Meyer Sound logo on the JM-1P grille frame:

• Pull up on the logo, rotate it to the desired position, and release.

The uptilt and downtilt angles achievable with the JM-1P are determined by the MTG-JM1 pickup hole used and the number of loudspeakers suspended. The table below provides a list of resulting angles using a single pickup point.

The optional MDB-JM1 dolly board transports the JM-1P on caster wheels. Up to three dolly boards can be interlocked for transporting up to three linked JM-1Ps. The interlocked dolly boards can be oriented normally with all three units facing the same direction, or they can be staggered to occupy less space during transport.

Figure 27: MDB-JM1 Dolly Board Dimensions

Figure 28: MDB-JM1 Dolly Board with JM-1P

Figure 29: Dimensions for Three MDB-JM1 Dolly Boards, Normal

Figure 30: Dimensions for Three MDB-JM1 Dolly Boards, Staggered

Compass RMS™ software provides extensive system status and performance data for each loudspeaker, including amplifier voltage, limiting activity, power output, heat sink temperature, fan and driver status, as well as mute and solo capability. Loudspeakers are added to the RMS network and assigned a node name during a one-time discovery procedure. Once loudspeakers are identified on the RMS network, they appear in Compass RMS as icons that can be customized, as shown in the figure below.

Compass RMS Window

Individual loudspeakers can be physically identified with the Wink option in RMS, which lights the Wink LED on the RMS module of that particular loudspeaker. Loudspeaker icons can be arranged in Compass RMS and saved as pages to represent how the loudspeakers have been deployed in the system. Multiple pages can be saved and recalled for specific performances and venues.

The RMS user panel includes three LEDs, two buttons, and two Network connectors.

RMS Module

Service LED (Red)

The red Service LED provides the following feedback:

• When unlit, the loudspeaker is successfully connected to the network and commissioned.

• When blinking once every two seconds, the loudspeaker is connected to the network but not yet commissioned in the RMS software.

• When lit continuously, the loudspeaker’s RMS hardware has failed and may indicate that the module has been damaged (contact Meyer Sound Technical Support).

Service Button

Pressing the Service button identifies the loudspeaker on the RMS network and notifies the RMS software that the loudspeaker is connected. Simultaneously press the Reset and Service buttons to reset the RMS module and decommission the loudspeaker from the network (see Resetting the RMS Module).

Wink LED (Green)

The green Wink LED lights when a signal is sent from the RMS software by clicking the Wink button on the loudspeaker’s icon or on its Text view. This feature is useful for identifying the physical loudspeaker corresponding to a loudspeaker icon in the RMS software.

Reset Button

Pressing the Reset button causes the RMS module’s firmware to reboot; this action will not affect whether the loudspeaker is commissioned (which is stored in flash memory). Simultaneously press the Reset and Service buttons to reset the RMS module and decommission the loudspeaker from the network (see Resetting the RMS Module ).

Activity LED (Green)

The green Activity LED flashes continuously when the loudspeaker has been successfully commissioned.

RMS Network Connectors

The Weidmuller 2-conductor, locking connectors transfer data to and from the RMS network. Two connectors are provided to allow for easy connection of multiple (daisy-chained) loudspeakers on the network. Included with each RMS-equipped loudspeaker are RMS cable connectors and mounting blocks for constructing RMS cables. The mounting blocks allow the Weidmuller connectors to be securely attached to the RMS module with screws.

Neuron ID for RMS Module

Each RMS module has a unique 12-character Neuron ID (NID) that identifies the loudspeaker on the network. The NID is automatically detected by RMServer but can also be entered manually, if necessary when configuring RMS systems in Compass RMS without loudspeakers present. The NID label is located on the RMS user panel near the orange Network connectors.

Resetting the RMS Module

You can use the Identify button to reset the RMS module when powering on the loudspeaker. This action will cause the module to be removed from the RMS network.

Procedure. To reset the RMS module:

1. Power down the loudspeaker.

2. Press and hold the Identify button.

3. While continuing to hold down the Identify button, power on the loudspeaker.

4. After the Wink/Status LED flashes on and off, release the Identify button. The RMS module is reset and the loudspeaker is removed from the RMS network.

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.

The JM-1P vertical rain hood is used when the loudspeaker is oriented vertically. The JM-1P vertical rain hood kit (PN 40.185.084.01) includes the following parts:

Vertical Rain Hood Dimensions: Lower Rain Hood Assembly

Vertical Rain Hood Dimensions: Upper Rain Hood Assembly

Installing the Vertical Rain Hood

Procedure. To install the JM-1P vertical rain hood:

1. Attach any required cables to the loudspeaker and orient it vertically.

2. Remove the bottom two pan head screws from the amplifier face.

   Removing Two Screws on Amplifier Face

3. Secure the upper rain hood frame to the amplifier face with the four 8-32 x 0.25 flat head screws, two at the top and two at the bottom.

   JM-1P Vertical Rain Hood Installation

4. Attach the upper rain hood assembly to the upper rain hood frame, slipping it under the frame's top flange and securing it to the bottom of the frame with the two 8-32 x .50 pan head screws.

5. Attach the lower rain hood assembly to the user panel, slipping it under the flange at the top of the user panel and securing it to the bottom of the panel with the two lock pins.

Note

• The vertical rain hood should only be used when the loudspeaker is oriented vertically (see the figure above).

• For permanent, fixed outdoor installations, both the lower and upper rain hood assemblies should be installed. For touring applications, the upper rain hood assembly can be removed, since the heat sinks and fan and can be safely exposed to occasional rain. However, for all outdoor applications, the lower rain hood assembly should always be installed to shield the unit’s connectors from rain.

The JM-1P horizontal rain hood is used when the loudspeaker is oriented vertically. The JM-1P horizontal rain hood kit (PN 40.185.084.02) includes the following parts:

Horizontal Rain Hood Dimensions: Lower Rain Hood Assembly

Horizontal Rain Hood Dimensions: Upper Rain Hood Assembly

Installing the Horizontal Rain Hood

1. Attach any required cables to the loudspeaker and orient it horizontally.

2. Remove the bottom two pan head screws from the amplifier face.

   Removing Two Screws from Amplifier Face

3. Secure the upper rain hood frame to the amplifier face with the four 8-32 x 0.25 flat head screws, two at the top and two at the bottom.

   JM-1P Horizontal Rain Hood Installation

4. Attach the upper rain hood assembly to the upper rain hood frame, slipping it under the frame's top flange and securing it to the bottom of the frame with the two at the bottom.

5. Attach the lower rain hood assembly to the user panel, slipping it under the flange at the top of the user panel and securing it to the bottom of the panel with the two lock pins.

Note

• The horizontal rain hood should only be used when the loudspeaker is oriented horizontally (see the figure above).

• For permanent, fixed outdoor installations, both the lower and upper rain hood assemblies should be installed. For touring applications, the upper rain hood assembly can be removed, since the heat sinks and fan and can be safely exposed to occasional rain. However, for all outdoor applications, the lower rain hood assembly should always be installed to shield the unit’s connectors from rain.