MPS-488X Front and Rear Panels
MPS-488X IntelligentDC Power Supply Front Panel
MPS-488X Front Panel
The MPS-488X front panel features LEDs for monitoring each loudspeaker channel.
Voltage and Load Current LEDs (1–8)
The Voltage and Load Current LEDs are useful for verifying whether each channel output has voltage and whether the connected loudspeakers are receiving DC power and audio signal.
MPS-488X Channel LEDs
Blue Voltage LEDs (1–8)
The blue Voltage LEDs indicate whether voltage is present at the outputs. When functioning normally, these LEDs
are illuminated when the MPS-488X is powered on. The MPS-488X’s intelligent circuit protection shields connected loudspeakers from surges and shorts. When a blue Voltage LED is unlit and its corresponding green Load Current
LED is flashing, a surge or a short has been detected for the channel. If a surge or a short is encountered, power down the MPS-488X and inspect the loudspeaker cabling connected to that output channel.
The table below lists the possible states for the Voltage LEDs.
Table : Blue Voltage LEDs
State | Cause | Recommended Action |
|---|---|---|
Unlit (all LEDs) | MPS-488X not powered on. | Verify the MPS-488X is connected to an energized power source. |
Unlit (single LED) | Surge or short encountered for a channel (corresponding Load Current LED flashes). | Power down the MPS- 488X and inspect the loudspeaker cabling connected to that output channel. |
Flashing (group of 4 LEDs or all 8 LEDs) | Internal failure encountered. | Service required; power down and disconnect the MPS-488X, then contact the Meyer Sound Service department. |
Flashing (single LED) | Residual voltage detected for channel. | Power down the MPS- 488X, then unplug and plug the channel’s loudspeaker cable back in, and apply power to the MPS-488X; if the problem persists, verify the loudspeaker cabling. |
Caution
When a blue Voltage LED is unlit and its corresponding green Load Current LED is flashing, indicating a surge or a short for the channel, power down the MPS-488X and inspect the loudspeaker cabling connected to that output channel.
Green Load Current LEDs (1–8)
Each green Load Current LED indicates whether a loudspeaker is connected to the corresponding channel output and receiving power. As a channel’s audio signal level increases, its green LED glows brighter. If a green LED is not lit, verify the channel’s blue Voltage LED is lit and check the cable connection to the loudspeaker. When a green Load Current LED flashes and its corresponding blue Voltage LED is unlit, a surge or a short has been detected for that channel. If a surge or a short is encountered, power down the MPS-488X and inspect the loudspeaker cabling for that channel.
The table below lists the possible states for the Load Current LEDs.
State | Cause | Recommended Action |
|---|---|---|
Unlit (all LEDs) | MPS-488X not powered on or no loudspeakers connected. | Verify the MPS-488X is connected to an energized power source; inspect the loudspeaker cabling. |
Unlit (single LED) | No loudspeaker connected. | Power down the MPS- 488X and inspect the loudspeaker cabling for the channel. |
Flashing (group of 4 LEDs or all 8 LEDs)) | Internal failure encountered. | Service required; power down and disconnect the MPS‑488X, then contact the Meyer Sound Service department. |
Flashing (single LED) | The channel has encountered a surge or a short (corresponding Voltage LED is unlit). | Power down the MPS-488X and inspect the loudspeaker cabling for that channel. |
Glows brighter (single LED) | LED glows brighter as channel’s audio signal level increases. | None required; visual indication of higher load current. |
Caution
When a blue Voltage LED is unlit and its corresponding green Load Current LED is flashing, indicating a surge or a short for the channel, power down the MPS-488X and inspect the loudspeaker cabling for that channel.
MPS-488X Rear Panel
The MPS-488X rear panel includes a power inlet, eight balanced audio inputs, seven Link switches for routing audio from inputs to outputs, eight outputs (DC power and balanced audio), an Ethernet port, Wink button, and Restore and Safe buttons.
AC Inlet
The MPS-488X has a Neutrik powerCON TOP twist-lock AC inlet connector (line, neutral/line, earth). This connector is rated for energized mating and functions as the power switch. Only use cords terminated with Neutrik powerCON TOP (NAC3FX-W-TOP or NAC3FX-W-TOP-L) connectors.
Use either the included power cord or, if the unit did not ship with an assembled cord, assemble the appliance end of a power cord using the included powerCON TOP connector. Follow the assembly instructions found on Neutrik’s web site (neutrik.com). Please see the “Power Requirements” section on page 8 for additional electrical requirements and information.
Channel Inputs
Up to eight channels of balanced audio are received from the MPS-488X’s channel inputs. The inputs are equipped with male 3-pin Phoenix connectors.
MPS-488X Channel Inputs
Input Connector Pinout
MPS-488X IntelligentDC Power Supply Rear Panel
Link Switches
Link switches determine how inputs are routed to outputs. When an input’s Link switch is OFF (down position),
the input is routed only to its corresponding output, for example, Input 1 routed to Output 1.
When a Link switch is ON (up position), the input is routed to its corresponding output and to the next adjacent output (for example, Input 1 routed to Output 1 and Output 2).
If multiple adjacent Link switches are ON, the input is routed to each adjacent output. For example, when Link switches 1 and 2 are ON, Input 1 is routed to Outputs 1–3.
Seven Link Switches, Highlighted
Link Switch Routing Examples
The following examples illustrate several common routing configurations of the Link switches.
Routing Eight Inputs to Eight Separate Outputs
To route eight inputs to eight separate channel outputs:
Set all Link switches to OFF.
Routing One Input to Eight Separate Outputs
To route one input to eight channel outputs:
Set all Link switches to ON.
Seven Link Switches, Highlighted
Routing Two Inputs to Four Outputs Each
To route two inputs to four channel outputs each:
Set the Link 4 switch to OFF and all other Link switches to ON.
Input Impedance for Linked Channel Inputs
When a Link switch is enabled, the channel input’s unbuffered source signal is transmitted in parallel to each linked channel output. This causes the loudspeaker’s effective input impedance (normally 10 kΩ for one loudspeaker) to be reduced for each linked output. For example, for one channel input to:
1 channel output, the effective loudspeaker input impedance is 10 kΩ
2 channel outputs, the effective loudspeaker input impedance is 5 kΩ.
4 channel outputs, the effective loudspeaker input impedance is 2.5 kΩ.
8 channel outputs, the effective loudspeaker input impedance is 1.25 kΩ.
To avoid distortion when linking channel inputs, make sure the source device is capable of driving the total effective load impedance of the linked loudspeakers.
Note
Most source devices are capable of driving loads no smaller than 10 times their output impedance. To drive eight loudspeakers linked from a single channel input, the source device should have an output impedance of approximately 100 ohms or less. The output impedance of Galileo GALAXY processor outputs is 50 ohms.
Channel Outputs
The MPS-488X’s eight channel outputs deliver DC power (48 V DC) and balanced audio to Meyer Sound IntelligentDC loudspeakers. The outputs are equipped with male 5-pin Phoenix connectors.
Caution
Make sure loudspeaker cables are wired correctly.
Note
For information about cable requirements for a particular loudspeaker, refer to its operating instructions.
HMS-15 loudspeakers require power from two contiguous channels of the MPS- 488X. If audio signal is present on both channels connected to an HMS-15, the audio signals are summed by the loudspeaker’s input electronics.
Multiple Ashby Ceiling Loudspeakers may be daisy-chained from one output channel. See the Ashby Operating Instructions, available at: meyersound.com/documents.
Tip
A single composite cable (such as Belden® 1502 or equivalent) is capable of transporting both DC power and balanced audio signals between channel outputs and IntelligentDC loudspeakers.
The MPS-488X channel output connectors include three pins for balanced audio (positive, negative, and shield) and two pins for DC power (positive and negative). The pins are clearly labeled on the MPS-488X rear panel.
MPS-488X Channel Outputs
Output Connector Pinout
Each MPS-488X comes with nine (8 + spare) female 5-pin Phoenix cable mount connectors for assembling loudspeaker cables.
Caution
The power supply and/or the loudspeaker electronics will be damaged if the cable connecting the power supply and the loudspeaker do not connect the correct pins of the power supply to the loudspeaker(s).
Damage due to mis-wiring is not covered by the product warranty. Please see the “Assembling Loudspeaker Cables” section on page 14.
With effort, it is possible to invert the Phoenix connector of a cable being plugged into the power supply or the loudspeaker. If the pins make contact and the power supply is powered, the electronics of the power supply and/or loudspeaker may be damaged and are not covered by the product warranty. If the use case includes the need to frequently connect/ disconnect loudspeakers from the power supply, extend the outputs of the power supply to a panel that provides users with connectors suitable for multiple mating cycles, e.g., 5-pin XLR connectors.
Rounded sides must align.
Do Not Force While Mating, Incorrect Connector Alignment
Network Connector
The rear panel includes a network connector labeled “Monitoring.” When connected to a computer running Meyer Sound’s Nebra software, telemetry data is displayed in the software. The network connector also facilitates uploading firmware updates.
If a network switch is used to connect multiple MPS-488X power supplies to a computer, the minimum requirement of the network switch is IEEE 802.3 compliance (standard for all things Ethernet) supporting at least 100 Mb/s full duplex connections. A certified AVB network switch is not required, but does include all the necessary functions.
Note
The network traffic of multiple MPS-488X power supplies and the network traffic of a Meyer Sound D-Mitri system control network are compatible on the same network and can utilize the same network switch(es).
MPS-488X Rear Panel
Monitoring Port LEDs
At the top of the connector are two LEDs which indicate Ethernet connection and activity as shown in the table below:
Green LED | Amber LED | Indication |
|---|---|---|
OFF | OFF | No link |
ON | OFF | 10BASE-T link with no activity |
BLINKING | OFF | 10BASE-T link with activity |
ON | ON | 100BASE-TX link with no activity |
BLINKING | ON | 100BASE-TX link with activity |
Note
The Ethernet MAC does not support speeds above 100 Mb/s
Wink Function
The Wink function facilitates the identification of physical power supplies with the power supplies listed in Meyer Sound’s Nebra software. When active, both Nebra software and MPS-488X indicate the when the Wink function is active. To active the Wink function, click the Wink icon (eye icon) in Nebra software or press the Wink button next to the power inlet of an MPS-488X. To deactivate, click the Wink icon or press the Wink button again.
Restore and Safe
These functions are provided in case there is an issue with the MPS-488X firmware. To activate either function, unplug the power cord from the power inlet. Press and hold either the Restore or Safe button and apply power. Continue holding down the button until the LEDs on the front panel flash.
When the Restore button is pressed, the firmware is reset to the factory defaults.
When the Safe button is pressed, the Recovery Mode firmware is loaded. Restarting in this mode is available in case the Normal Mode firmware is corrupted. Once the MPS-488X has completed startup, upload Normal Mode firmware, and restart normally. See “Firmware” section later in this document for firmware upload instructions.