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MPS-488 Power Supply (48V DC)
The MPS-488 external power supply delivers DC power and balanced audio to Meyer Sound loudspeakers that require a 48 V DC external power supply. Originally designed for use with the MM-4XP miniature loudspeaker, the multichannel, switched-mode, regulated power supply is also compatible with the UP-4XP ultracompact loudspeaker, HMS-10 surround loudspeaker, and MM-10 subwoofer. The MPS-488 can power up to eight MM-4XPs, or up to four UP-4XPs, HMS-10s, and MM-10s (due to additional current draw from these loudspeakers).
The single-space, 19-inch rack MPS-488 receives eight channels of balanced audio from its eight XLR female input connectors and routes the audio, along with 48 V of DC power, to its eight output connectors. Input channels feature toggle switches that route inputs to corresponding channel outputs only, or to adjacent, contiguous channel outputs. For example, channel input 1 could be routed to channel outputs 1 and 2 and channel input 3 could be routed to channel outputs 3 and 4. Another example would be to route channel input 1 to channel outputs 1–4 and channel input 5 to channel outputs 5–8.
The power supply's eight channel outputs are available as either Phoenix 5-pin male connectors on the MPS-488p model, or SwitchCraft® EN3 5-pin female connectors on the MPS-488e model. Outputs can deliver DC power to loudspeakers at cable lengths of up to 300 feet for the MM-4XP — or 150 feet for the UP-4XP, HMS-10, and MM-10 — with just 1 dB of loss in peak SPL using 18 AWG wire. The use of composite multiconductor cables (such as Belden® 1502) allows a single cable to carry both audio and DC power from the MPS-488 to the loudspeakers. Longer cable lengths are possible for moderate applications that don't drive the loudspeakers to maximum output, or for installations with heavier wire gauges.
The MPS-488 front panel has two LEDs per output channel that provide useful feedback on the status of the system. The voltage LEDs indicate when voltage is present for each output channel. The load current LEDs indicate when a loudspeaker is connected to an output channel and glow brighter as the signal level increases.
Amplifier and signal processing circuits for the loudspeakers are designed to tolerate voltage drops of up to 30 percent and their energy storage circuits minimize the system's peak-to-average current demands, ensuring efficient use of the MPS-488's 48 V DC output.
MPS-481 Power Supply (48V DC)
The MPS-481 external power supply provides DC power for a single MM-4XP loudspeaker (not recommended to power UP-4XP or MM-10XP). The MPS-481 includes a 10-foot cable that receives balanced audio from its XLR female input connector and routes the audio, along with 48 V of DC power from the power supply to a Switchcraft EN3 5-pin connector that attaches to the MM-4XP input connector. The compact MPS-481 includes a bracket for mounting the power supply on walls and ceilings.