Operating Instrucctions — MPS-488X External Power Supply

The MPS-488X provides DC power and delivers balanced audio signals to Meyer Sound IntelligentDC loudspeakers.

MPS-488X IntelligentDC Power Supply
The 1RU, standard 19-inch rack-mount MPS-488X can be used with a number of products that feature IntelligentDC technology, including MM-4XP, UP-4slim, Ashby ceiling loudspeakers, the HMS series of surround loudspeakers, the ULTRA-X20 models, and the USW-112XP subwoofer.
Powering loudspeakers from an external 48 V DC source eliminates the need for wiring conduits while preserving the advantages of self-powered loudspeakers. Meyer Sound’s IntelligentDC loudspeakers are equipped with on-board amplification and signal-processing circuits that store DC power and tolerate voltage drops (up to 30 percent), thereby accommodating light-gauge cables and lengthy cable runs.
The MPS-488X receives up to eight channels of balanced audio from its input connectors and routes the audio, along with DC power, to its eight output connectors.
Input channels feature toggle switches that route audio to corresponding outputs only, or to adjacent, contiguous
outputs. For example, the input of channel 1 can be routed to outputs 1-2, the input of channel 3 can be routed to outputs 3–4. In another example, the input of channel 1 can be routed to outputs 1–4 and the input of channel 5 can be routed to outputs 5–8.
The MPS-488X includes eight 5-pin male Phoenix connectors for connection to IntelligentDC loudspeakers. These outputs are protected from short circuits and unexpected voltages. Each output is capable of delivering DC power to loudspeakers at cable lengths up to 150 or 300 feet (depending on loudspeaker model) with just 1 dB of loss in peak SPL using 18 AWG wire. The use of composite multi-conductor cables (such as Belden® 1502) allows a single cable to carry both balanced audio and DC power from the MPS-488X to the loudspeakers. Longer cable lengths are possible when the power conductor’s diameter is increased or when an application does not require the loudspeakers to achieve their maximum acoustic output.
The power supply’s front panel has two LEDs per output channel that provide useful feedback on the status of the system. The blue voltage LEDs indicate when voltage is present for each output channel. The green load current LEDs illuminate when a loudspeaker is connected to an output channel, glow brighter as the signal level increases, and flash if a short circuit is encountered.
The network connector is utilized to send telemetry data to a computer running Meyer Sound’s Nebra software. The software displays the status and performance parameters of the power supply. Additionally, mute and wink functions are available.
Caution
This power supply is designed for indoor use, not designed to be weather resistant. It does not tolerate exposure to moisture, rain, extreme humidity, or extreme heat.
MPS-488X Shipping Contents

When shipped, the MPS-488X IntelligentDC Power Supply includes safety and compliance declaration documents, a wiring warning document, and the following connectors and cords:
Quantity | Description | Part Number |
---|---|---|
1 | MPS-488X IntelligentDC Power Supply | |
9 (8 + 1 spare) | 3-pin, female Phoenix connector | 484.049 |
9 (8 + 1 spare) | 5-pin, female Phoenix connector | 484.053 |
1 | Power cord for region or cable-mount connector for power inlet |
Note
All MPS-488X IntelligentDC power supplies ship with either an assembled power cord or a cable-mount connector (Neutrik NAC3FX-W-TOP). Compliance regulations of the destination country determine whether an assembled cord or cable mount connector that mates with the power inlet is included.

MPS-488X IntelligentDC Power Supply Front and Rear Views
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.
Power Requirements

MPS-488X Current Draw

The current draw of the MPS-488X is dependent on two factors, the level of the audio signal(s) being reproduced by the connected IntelligentDC loudspeakers and the model(s) of IntelligentDC loudspeakers that are connected to the outputs.
The maximum power draw (> 10 seconds) of an MPS-488X is 1350 watts. Users are required to provide adequately sized breakers and electrical supply cords rated to carry this load. To calculate amperage, divide 1350 watts by the available electrical supply voltage, e. g., 1350 watts divided by 230 V AC is 5.9 amps.
MPS-488X Voltage Requirements

The operating voltage range of an MPS-488X is 100 - 240 V AC, 50 or 60 Hz. Make sure the voltage measured at the appliance end of the power cord is within the operating voltage range before applying power to the MPS-488X.
Caution
Damage to the IntelligentDC power supply and/or connected loudspeakers may occur if the voltage of the electrical source is not within the operating voltage range.
Note
For best performance, the AC cable voltage drop should not exceed 10 V, or 10 percent at 115 V and 5 percent at 230 V. Measure the AC voltage at the appliance end of the power cord to verify the voltage is within the operating voltage range.
Circuit Breaker Requirements

The circuit Breakers used in the Meyer Sound MDM-5000 are well suited for use with MPS-488X IntelligentDC power supplies and other Meyer Sound products:
European MDM-5000 includes ETI model number:
KZS-1M 1p+N A C16/0.03, 6kA, which includes an RCD (residual current device) with a C-type tripping time constant and 30 mA RCD.
US MDM-5000 includes Eaton model:
QCR2020 - CIRCUIT BREAKER 2-Pole, 20 A, 120/240 V AC
Circuit protection devices for main and branch circuits of any power distribution system used in conjunction with MPS-488X IntelligentDC power supplies should use similarly specified devices to avoid nuisance tripping.
Note
Many RCCB’s (residual current circuit breakers) are sensitive to high-frequency noise in the Line-Neutral path and may false/nuisance trip. If required, make certain the residual current device is not sensitive to high-frequency noise or artifacts. Line-to-Ground and Neutral-to-Ground capacitance can cause an imbalance between the current carrying conductors in a cable or a conduit, potentially causing RCCB nuisance tripping. Consult with a licensed electrician or electrical engineer when designing electrical distribution systems.
Electrical Safety Guidelines

Pay close attention to these important electrical and safety guidelines.
This Meyer Sound product requires a grounded outlet. Always use a grounded outlet and plug.
Do not use a ground-lifting adapter or cut the AC plug ground pin.
Keep all liquids away from the MPS-488X to avoid hazards from electrical shock.
Do not operate the MPS-488X if the power cable is frayed or broken.
Powering Loudspeakers

Note
For information about cable requirements for a particular loudspeaker, refer to its operating instructions.
Caution
Make sure loudspeaker cables are wired correctly.
Power off the MPS-488X.
Connect audio sources (from a mixer or processor) to the MPS-488X channel inputs.
Use the MPS-488X Link switches to route channel inputs to the desired channel outputs (see “Link Switches” on page 5).
Connect the loudspeakers to the MPS-488X channel outputs. Use composite cables (such as Belden® 1502 or equivalent) wired for both DC power and balanced audio and outfitted with the appropriate connectors.
Power on the MPS-488X and monitor the LEDs on its front panel to verify the connections (see “Blue Voltage LEDs (1–8)” on page 3 and “Green Load Current LEDs (1–8)” on page 4).
Check loudspeaker LEDs to verify whether the loudspeakers are ready to reproduce audio.
Enable output from the audio sources (from the mixer or processor) connected to the MPS-488X.
Tip
For connection between the MPS-488X and IntelligentDC loudspeakers, two cables can be used: a 2-conductor cable for DC power and a 3-conductor cable for balanced audio, both attached to a single Phoenix connector on each cable end. This approach enables the conductor diameters of the DC cable to be increased for longer cable runs.

MPS-488XP with Eight ULTRA-X20XP Loudspeakers


MPS-488XP with Eight ULTRA-X20XP Loudspeakers
Note
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, audio signals are summed by the loudspeaker’s input electronics.
Caution
Make sure loudspeaker cables are wired correctly.
Telemetry

The MPS-488X transmits telemetry data via a standard Ethernet network to a computer running Meyer Sound’s Nebra software. The Nebra software displays many parameters of the MPS-488X and the connected loudspeakers, including signal level, temperature, fan speed, and output voltage. A mute function for each channel is also available.

Nebra Software, MPS-488X Sidebar Panel - Details, Inventory, Network Tabs
Firmware

There are three ways to update the firmware of an MPS-488X, automatically and manually using Nebra software and manually using a web browser.
Automatic Firmware Update

When the Nebra computer is connected to the Internet, firmware updates are automatically downloaded. When an MPS-488X is connected to the Nebra computer, Nebra will prompt users if a newer version of firmware is available to be uploaded to the MPS-488X.
Manual Firmware Update - Nebra

Firmware can be manually uploaded using Nebra software when the computer is connected to an MPS-488X. Select an MPS-488X in the Device Workspace to open the sidebar panel, then click the three-dot more icon. Select Upload Firmware from the contextual menu to start uploading the most recent version of the firmware Nebra has downloaded.
Note
Connect the Nebra computer to the Internet and launch the Nebra software. Nebra will automatically download the most recent versions of all available Meyer Sound device firmware, including the firmware for the MPS-488X.

Nebra Software, MPS-488X Sidebar Panel, Contextual Menu
Manual Firmware Update – Web Browser

When manually updating the firmware using a web browser and the MPS-488X web server, please contact Technical Support to receive the current MPS-488X firmware file by visiting meyersound.com/contact and selecting the appropriate options from the drop-down menus.
To update the firmware using a web browser, establish a network connection between the computer and the MPS- 488X, then follow the steps below.
Open a web browser and enter either:
The IPv4 address of the MPS-488X, e. g.,
http://192.168.0.120
.By default (and following a factory reset), this is
192.168.0.120
. The current IPv4 address is displayed in the Nebra Sidebar.mps-488x_<serial number>local, e. g.,
http://mps- 488x_22278410.local/
The <serial number> is the serial number of the MPS-488X found on the rear panel.
Enter the login credentials for the MPS-488X. The default value is “admin” for both the username and password.
Click the Advanced settings tab.
Web Browser MPS-488X Interface, Dashboard Tab
Click the Choose File button in the Normal Mode Update section.
Web Browser MPS-488X Interface, Advanced Settings Tab
Navigate to the new MPS-488X firmware file, e. g., 1.0.0.1266-20230120-0914.mps488XFirmware, then click Open.
Click the Update Normal Mode Image button to start the firmware upload.
Web Browser MPS-488X Interface, Advanced Settings Tab, Firmware Upload in Progress
Click Yes when prompted that the device will be disconnected.
When the upload is complete, the MPS-488X will reboot.
To confirm the firmware upload successfully, reload the web page and log in.
Select the Advanced settings tab again and confirm the Current Normal Mode Version firmware listed corresponds to the firmware version uploaded.
Repeat steps 4-9, but this time choosing Recovery Mode Update and the corresponding firmware file, e. g., 1.0.0.1266-20230120-0914.mps488XRecoveryFirmware.
After logging back into the web page, confirm that both the Current Normal Mode Version and Current Recovery Mode Version correspond to the uploaded files.
Logs

Each MPS-488X logs and saves various parameters. These logs can be downloaded to the Nebra computer by selecting an MPS-488X in the Devices Workspace, clicking the three-dot more menu in the Sidebar Panel, and selecting Download Logs.

Nebra Sidebar Contextual Menu
These logs include uptime, temperature, power supply status, channel status, fan, and power data.
Nebra Software

Meyer Sound’s Nebra software includes functions and monitoring of MPS-488X power supplies: monitoring of performance, operational controls, and firmware management. An Ethernet network connection is all that is required between one or many MPS-488X and a computer running Nebra software.

MPS-488X Accessories

IntelligentDC Loudspeaker Cables

The following cable and connectors are available from Meyer Sound and can be used to connect loudspeakers to MPS-488X power supplies.
Note
Loudspeaker cable assemblies commonly use Belden® 1502R (regular) or Belden® 1502P (plenum) cable. These are composite cables comprised of two 18 AWG [1 mm2] conductors for DC power, two 22 AWG [0.5 mm2] conductors for balanced audio, and one 24 AWG conductor for audio shield.
Part number | Cable | Color | Coating | Length |
---|---|---|---|---|
524.014 | Bulk (no connectors) | Black | Regular | 500 ft [152 m] spool |
524.015 | Bulk (no connectors) | White | Plenum | 500 ft [152 m] spool |
Pheonix Cable Connectors

The following cable connectors are available from Meyer Sound.
Part Number | Connector | Use |
---|---|---|
484.053 | 5-pin female Phoenix cable mount connector | Mates to MPS-488X channel output connectors |
484.049 | 3-pin female Phoenix cable mount connector | Mates to MPS-488X channel input connectors |

5-Pin Female Phoenix Connector with White (Plenum) or Black (Regular) Cables.


Assembled Phoenix-to-Phoenix Cable
Assembling Loudspeaker Cables

Assembling Pheonix-to-Pheonix Loudspeaker Cables

Caution
When wiring loudspeaker cables, it is extremely important that each pin be wired correctly. Make sure the 48 V DC from the external power supply is wired directly (and only) to the 48 V DC pins on the loudspeaker connector, and the polarity is observed (negative to negative, positive to positive) to avoid damage to the loudspeaker and/or power supply. In addition, make sure that audio pins are wired correctly; polarity reversals for audio signals affect system performance.
When connecting loudspeakers and power supplies equipped with Phoenix connectors, a cable terminated with 5-pin female Phoenix connectors at both ends is needed. The following procedure documents how to assemble these cables.
Remove 1 inch [2.5 cm] of the outer jacket and then strip the black, red, blue, and white wires by 0.275 inches [0.7 cm].
Add non-conductive insulation tubing to the shield conductor, cut to length so that 0.275 inches [0.7 cm] of the conductor is left exposed. This prevents unintentional shorting to other conductors.
Insert the five exposed conductors into the five cable holes of a 5-pin female Phoenix cable mount connector. Use the following wiring scheme.
Pin Destinations for 5-Pin Phoenix Female Cable Mount Connector
Proper Assembly of 5-Pin Phoenix Female Connector
Secure the conductors by tightening the screws in the Phoenix cable mount connector. Screws should be torqued to 0.5–0.6 N·m [4.4 - 5.3 in-lb]. Tug the conductors to ensure they are sufficiently retained.
Caution
Screws should not be tightened while the connector is mated to a male Phoenix connector. Doing so will damage the contacts. During assembly, the Phoenix connector should only be held in place externally.
Repeat the previous steps and attach the other end of the cable to another 5-pin Phoenix female cable mount connector.
6. Verify the wiring polarity is correct for both cable ends.
Compliance

Federal Communications Commission (FCC) Statement

This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try and correct the interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
Consult the dealer or an experienced radio/TV technician for help.
ICES-003 CLASS B NOTICE - AVIS NMB-003, CLASSE B
This Class B digital apparatus complies with Canadian ICES-003