Singing Machine SMC273
SingCast K-Box Video Casting Karaoke Machine
Model: SMC273
Brand: Singing Machine
Introduction
Welcome to the world of interactive entertainment with your new Singing Machine SingCast K-Box. This versatile karaoke machine combines video casting technology, Bluetooth audio streaming, and vibrant LED lights to create an immersive karaoke experience. Designed for ease of use, the SingCast K-Box allows you to project content from the SMC Karaoke App wirelessly to your TV, ensuring everyone can follow along and join the fun. Please read this manual carefully to ensure proper setup and operation of your device.

The Singing Machine SingCast K-Box, showcasing its front panel, display, controls, and integrated microphone holder.
What's in the Box
Please check the contents of your package to ensure all items are present:
- SMC273 SingCast K-Box System
- One wired microphone
- AC adapter
- 1 free month access to Singing Machine karaoke app (details inside)
Setup Guide
1. Power Connection
- Connect the AC adapter to the DC IN jack on the back of the SingCast K-Box.
- Plug the AC adapter into a standard wall outlet.
- Press the ON/STANDBY button on the unit to power it on.
2. Microphone Connection
- Insert the plug of the wired microphone into either the MIC 1 or MIC 2 jack on the front of the unit.
- Adjust the MIC VOLUME knob to control the microphone's output level.
3. Bluetooth Audio Streaming
- Press the FUNCTION button repeatedly until "BT" appears on the display.
- On your Bluetooth-enabled device (smartphone, tablet, etc.), enable Bluetooth and search for "SINGING MACHINE".
- Select "SINGING MACHINE" from the list of available devices to pair. A confirmation tone will sound when connected.
- You can now stream audio wirelessly from your device to the SingCast K-Box.
4. HDMI Connection & Video Casting
The SingCast K-Box features video casting technology to display content from the SMC Karaoke App on your TV.

The SingCast K-Box can hold a tablet for easy viewing of lyrics, while casting the content to a larger screen.
- Connect your Singing Machine to your TV via an HDMI cable (not included) to the HDMI port on the back of the unit.
- Ensure your TV input is set to the corresponding HDMI port.
- Download and open the SMC Karaoke App on your smartphone or tablet.
- Scan the QR code displayed on your TV screen (from the SingCast K-Box HDMI output) to connect your app to the machine.
- Connect your SingCast K-Box to your home Wi-Fi network through the app's instructions.
- Once connected, you can cast your favorite karaoke videos from the app to your TV.

Visual guide for connecting and casting karaoke videos to your television.
Operating Your SingCast K-Box
Controls Overview
- FUNCTION: Cycles through input modes (Bluetooth, Line In, USB, HDMI).
- MASTER VOLUME: Adjusts the overall sound output level.
- MIC VOLUME: Controls the microphone's volume.
- VOICE EFFECTS: Applies various vocal effects to your singing.
- LIGHTS: Toggles the multi-colored LED lights on/off or changes light modes.
- VOCALS OFF: Reduces or removes lead vocals from compatible tracks.
- RECORD: Records your performance to a connected USB device.
- PLAY/PAUSE, STOP, SKIP: Standard playback controls for USB or app content.
Adjusting Volume and Effects
Use the MASTER VOLUME knob to set the desired music volume. Adjust the MIC VOLUME knob to balance your voice with the music. Experiment with the VOICE EFFECTS knob to add echo or other vocal enhancements.
Using Vocal Off
Press the VOCALS OFF button to reduce or eliminate the lead vocals from a song. This feature works best with tracks specifically designed for karaoke or with clear vocal separation.
Recording Your Performance
To record your singing, insert a USB flash drive into the USB port. Press the RECORD button to start recording. Press it again to stop. Your performance will be saved to the USB drive.
Light Modes
The SingCast K-Box features multi-colored LED lights that synchronize to the music. Press the LIGHTS button to cycle through different light modes or to turn the lights off.
Maintenance and Care
- Cleaning: Wipe the unit with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Storage: When not in use, store the unit in a cool, dry place away from direct sunlight and extreme temperatures.
- Ventilation: Ensure proper ventilation around the unit to prevent overheating. Do not block any ventilation openings.
- Water Exposure: Keep the unit away from water and moisture. Do not operate with wet hands.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | AC adapter not connected properly; Power outlet not active. | Ensure AC adapter is securely plugged into the unit and a working wall outlet. |
| No sound | Volume too low; Incorrect input mode selected; Microphone not connected. | Increase MASTER VOLUME and MIC VOLUME. Press FUNCTION to select correct input. Ensure microphone is plugged in. |
| Bluetooth not connecting | Unit not in Bluetooth mode; Device too far; Already paired to another device. | Press FUNCTION until "BT" appears. Move device closer. Disconnect from other devices and try pairing again. |
| No video on TV | HDMI cable not connected; TV input incorrect; App not connected to machine. | Ensure HDMI cable is securely connected. Select correct HDMI input on TV. Follow app instructions to connect to the SingCast K-Box. |
Specifications
| Feature | Detail |
|---|---|
| Product Dimensions | 13.8 x 9.1 x 14.9 inches |
| Item Weight | 6.25 pounds |
| Model Number | SMC273 |
| ASIN | B09XBW3YDM |
| Color | Black |
| Special Feature | Echo Effect, Video Casting, Bluetooth Audio Streaming, Multi-colored LED lights, Lead Vocal Off |
| Connectivity | Bluetooth, HDMI, LINE IN, USB |
| Microphone Jacks | 2 (one microphone included) |

Product dimensions for the SingCast K-Box.
Warranty and Support
For warranty information and technical support, please refer to the documentation included with your product or visit the official Singing Machine website. You can also visit the Singing Machine Store on Amazon for more product details and support options.
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