EMB Pro EBK37BT 700-watt Digital Rack Mountable Karaoke Mixer Stereo Amplifier User Manual

1. Product Overview

The EMB Pro EBK37BT is a 700-watt digital rack mountable karaoke mixer stereo amplifier designed for versatile audio mixing and amplification. It features USB, Echo, and Bluetooth streaming capabilities, making it suitable for various audio setups. The intuitive control panel allows for precise adjustment of sound parameters, ensuring stable audio levels and high-quality performance.

This image shows the front panel of the EMB Pro EBK37BT karaoke mixer amplifier, highlighting its various controls and inputs.

2. Key Features

• 700 Watts Peak Power: Delivers robust audio output for various applications.
• Two Microphone Inputs: Allows for simultaneous use of two microphones with individual controls.
• Bass Functions: Dedicated bass controls for enhanced low-frequency sound.
• Echo Selector: Adjustable echo effects for vocal enhancement.
• Remote & Volume Control: Includes a remote control for convenient operation and master volume control.
• USB & Bluetooth Streaming: Integrated USB port and Bluetooth connectivity for versatile audio playback.
• Rack Mountable Design: Standard size for easy integration into professional audio racks.

3. Package Contents

• EMB Pro EBK37BT Karaoke Mixer Stereo Amplifier
• Remote Control
• Power Cable
• User Manual

4. Safety Information

Please read all instructions carefully before operating this device. Keep this manual for future reference.

• Power Source: Connect the unit to a power supply of the type indicated on the rear panel.
• Ventilation: Ensure proper ventilation. Do not block ventilation openings.
• Water and Moisture: Do not expose the unit to rain or moisture. Do not place objects filled with liquids on the unit.
• Heat: Do not place the unit near heat sources such as radiators, heat registers, stoves, or other apparatus that produce heat.
• Servicing: Do not attempt to service the unit beyond what is described in this manual. Refer all servicing to qualified service personnel.
• Grounding: This unit uses a 3-prong power cable. Ensure proper grounding to prevent electrical shock.

5. Setup

5.1 Rack Mounting (Optional)

The EBK37BT is designed to be rack mountable. If you intend to install it in an audio rack, ensure sufficient space for ventilation. The unit includes side wings for secure rack installation.

5.2 Speaker Connection

Connect your passive speakers to the "SPEAKER" binding post terminals on the rear panel. Ensure correct polarity (red to red, black to black) for optimal sound quality. The binding posts allow for bare wire connections or banana plugs.

This image displays the rear panel of the amplifier, showing the speaker terminals and various input/output options.

5.3 Power Connection

Connect the provided power cable to the AC input on the rear panel and then to a suitable wall outlet. Ensure the voltage selector (115V/230V) is set correctly for your region before powering on the unit.

5.4 Bluetooth Antenna

Extend the Bluetooth antenna on the rear panel for optimal wireless signal reception. While it often works fine in a lowered position, extending it can improve range and stability.

6. Operating Instructions

6.1 Powering On/Off

Press the "POWER" switch on the front panel to turn the amplifier on or off. The power indicator light will illuminate when the unit is on.

6.2 Initial Volume Settings

Before playing any audio, ensure all individual volume knobs (MIC1, MIC2, ECHO, MUSIC) are set to their minimum position. Gradually raise the "MIC MASTER VOLUME" and "MUSIC MASTER VOLUME" knobs to a comfortable listening level.

This image provides a detailed view of the front panel, showing all individual channel controls and master volume knobs.

6.3 Input Selection

Use the "INPUT" selector button on the front panel to cycle through available audio sources: USB, Bluetooth, VCD, and DVD. The selected input will be indicated on the display.

6.4 Microphone Usage

Plug your microphones into the "MIC1" or "MIC2" 1/4-inch inputs on the front panel. Adjust the individual "VOL", "BAL", "ECHO", "LOW", "MID", and "HIGH" knobs for each microphone channel to achieve desired sound. A -10dB gain control is available for each mic input.

6.5 Music Playback

Connect your music source (USB drive, Bluetooth device, VCD/DVD player) and select the corresponding input. Adjust the "MUSIC" volume, balance, and tone controls (LOW, MID, HIGH) to blend with the microphone audio.

7. Detailed Connections

7.1 Front Panel Connections

• MIC1/MIC2 Inputs: 1/4-inch jacks for dynamic microphones.
• USB Port: For playing audio files from a USB drive.

7.2 Rear Panel Connections

• Speaker Outputs: Binding post terminals for connecting passive speakers.
• AC Voltage Selector: Switch between 115V and 230V power.
• Fuse Tray: Contains the replaceable fuse for power protection.
• Bluetooth Antenna: Extend for optimal Bluetooth reception.
• MIC Insert: 1/4-inch inputs for microphones, identical to front panel.
• Input Video Out: Analog video outputs (VCD, DVD).
• Audio Outputs (MIC, REC, LINE): RCA outputs for microphone-only, recording, and variable line-level audio.
• Audio Inputs (VCD, DVD): RCA inputs for external audio sources.
• Effects Loop (IN/OUT): RCA connections for external effects processors or EQs. Ensure jumpers are in place if not using external effects.
• Key Controller: Input for an external key controller.
• Volume Reset (ON/OFF): Switch to enable/disable automatic volume reset upon power cycle.

8. Controls

8.1 Microphone Controls (MIC1, MIC2)

• VOL: Adjusts the volume level of the individual microphone.
• BAL: Adjusts the stereo balance (left/right) for the microphone.
• ECHO: Controls the amount of echo effect applied to the microphone.
• LOW/MID/HIGH: 3-band equalizer for adjusting the tone of the microphone.
• -10dB Pad: Reduces the input gain by 10dB for loud microphones.

8.2 Echo Controls

• VOL: Master volume for the echo effect.
• LOW/HIGH: 2-band equalizer for the echo effect.
• REPEAT: Adjusts the number of echo repetitions.
• DELAY: Adjusts the time between echo repetitions.
• STEREO/MONO: Selects stereo or mono output for the echo.

8.3 Music Controls

• VOL: Adjusts the volume level of the music source.
• BAL: Adjusts the stereo balance (left/right) for the music.
• LOW/MID/HIGH: 3-band equalizer for adjusting the tone of the music.

8.4 Master Controls

• MIC MASTER VOLUME: Overall volume control for all microphone inputs.
• MUSIC MASTER VOLUME: Overall volume control for all music inputs.
• INPUT: Selects the active audio input source.
• PITCH Control: Adjusts the pitch of the music playback.

9. Maintenance

• Cleaning: Use a soft, dry cloth to clean the unit. Do not use abrasive cleaners or solvents.
• Fuse Replacement: If the unit does not power on, check the fuse in the rear panel tray. Replace with a fuse of the same type and rating (e.g., 230V/1.6A or 115V/4A).
• Ventilation: Keep ventilation openings clear to prevent overheating.

10. Troubleshooting

• No Power: Check the power cable connection, the power switch, and the fuse. Ensure the voltage selector is set correctly.
• No Sound: Verify all input and output connections. Check volume levels (individual, master, and source device). Ensure correct input source is selected. If using external effects, check effects loop jumpers.
• Distorted Sound: Reduce volume levels. Check for proper impedance matching with speakers. Ensure cables are securely connected.
• Crackling/Popping Noise: Check all cable connections for looseness or damage. Ensure proper grounding of all connected audio equipment to avoid ground loops.
• Bluetooth Connection Issues: Ensure the Bluetooth antenna is extended. Check that the amplifier is in Bluetooth input mode. Forget the device on your phone/tablet and try pairing again.

11. Specifications

12. Warranty & Support

This product comes with a standard manufacturer's warranty. For specific warranty details, please refer to the warranty card included in your package or contact EMB customer support.

For technical support or service inquiries, please visit the official EMB website or contact their customer service department. Keep your purchase receipt as proof of purchase for warranty claims.