Overview
SML625BTBK is a karaoke system that supports karaoke playback from a CD+G disc or a USB drive. It also supports Bluetooth and Line-In.
The preferred way to use this model is with the Singing Machine mobile app.
Key features
- Preferred karaoke experience through the Singing Machine mobile app
- Plays karaoke from CD+G discs (lyrics display when connected to a TV)
- Plays karaoke from USB (MP3+G files for lyrics)
- Bluetooth audio streaming
- Line-In (AUX) input
- Connects to a TV for lyrics and video (RCA video + audio out)
- Microphone inputs for singing
Using the Singing Machine app
Stream karaoke directly to your machine
The Singing Machine app is the recommended way to access thousands of karaoke songs. Pair the app to your machine and stream high-quality karaoke videos with on-screen lyrics.
What you get with the app:
- 100,000+ songs — Access a massive karaoke catalog with new songs added every Friday
- High-quality videos — Engaging karaoke videos that keep the party going, or choose lyrics-only mode to save bandwidth
- Optional lead vocals — Toggle lead vocals on or off to sing solo or get vocal support
- DJ mode — Queue up to 100 songs and control the playlist from your device
- Easy pairing — Quick wireless connection between your device and karaoke machine
Getting started:
- Open the Singing Machine Karaoke app on your phone or tablet
- Power on your karaoke machine
- Connect your device to the karaoke machine via Bluetooth
- Choose a song in the app and start singing
Subscription options:
Purchase an in-app subscription to unlock unlimited access to the full catalog. Certain plans include a 30-day free trial.
Connecting via Bluetooth
You can use Bluetooth to connect your phone or tablet to the karaoke machine for audio.
Pairing steps
- Turn on the karaoke machine.
- Press the CDG/USB/BT button until Bluetooth is selected.
- On your phone or tablet, open Settings and select Bluetooth.
- Turn Bluetooth On.
- Look for your karaoke machine in the list of available devices (the name may include Singing Machine).
- Tap the device name to pair.
- If prompted for a PIN, try 0000.
If you do not see the machine in the Bluetooth list
- Press the PAIR button to restart pairing.
- Turn Bluetooth off and back on on your phone or tablet.
- Turn the karaoke machine off, wait 10 seconds, then turn it back on.
- If the machine is already paired to another nearby device, disconnect it on that device and try again.
If pairing succeeds but you still do not hear sound
- Turn up the volume on both the karaoke machine and your phone or tablet.
- Make sure your phone or tablet is using the karaoke machine as the audio output device.
- Disconnect the Bluetooth connection, then reconnect.
Connecting to a TV (RCA)
Connecting your machine to a TV lets you see karaoke lyrics and video.
Setup steps
- Connect the yellow RCA cable from the karaoke machine’s VIDEO OUT to your TV’s VIDEO IN.
- Connect the red and white RCA cables from the karaoke machine’s AUDIO OUT (R/L) to your TV’s AUDIO IN.
- Use your TV remote to select the correct AV or Video input.
Note about lyrics
- For CD+G, lyrics display when playing a CD+G disc and the machine is connected to a TV.
- For USB, lyrics display when playing MP3+G files through the USB port.
- Nothing will display on the TV when using Line-In or Bluetooth.
Connecting via Bluetooth
You can use Bluetooth to connect your phone or tablet to the karaoke machine for audio.
Pairing steps
- Turn on the karaoke machine.
- Press the CDG/USB/BT button until Bluetooth is selected.
- On your phone or tablet, open Settings and select Bluetooth.
- Turn Bluetooth On.
- Look for your karaoke machine in the list of available devices (the name may include Singing Machine).
- Tap the device name to pair.
- If prompted for a PIN, try 0000.
If you do not see the machine in the Bluetooth list
- Press the PAIR button to restart pairing.
- Turn Bluetooth off and back on on your phone or tablet.
- Turn the karaoke machine off, wait 10 seconds, then turn it back on.
- If the machine is already paired to another nearby device, disconnect it on that device and try again.
If pairing succeeds but you still do not hear sound
- Turn up the volume on both the karaoke machine and your phone or tablet.
- Make sure your phone or tablet is using the karaoke machine as the audio output device.
- Disconnect the Bluetooth connection, then reconnect.
Using Line-In
You can connect another audio device (like a phone, tablet, or laptop) using a 3.5 mm audio cable.
Setup steps
- Turn on the karaoke machine.
- Plug the audio cable into the karaoke machine’s LINE IN jack.
- Plug the other end into your external device’s headphone or audio-out port.
- Line-In mode is selected automatically when the cable is connected.
- Set the external device volume to about one-third to start, then adjust as needed.
Troubleshooting
No power
- Make sure the karaoke machine is turned on.
- Confirm the AC adapter is connected securely to the back of the unit.
- Try a different wall outlet.
No sound
- Turn up the Master Volume.
- Make sure the correct mode is selected (CDG, USB, Bluetooth, or Line-In).
- If you are using an external device, turn up the volume on that device.
- If you are trying to use Bluetooth or CD/USB and Line-In is still plugged in, unplug the Line-In cable.
No sound when connected to a TV
- Make sure the TV volume is not muted and is turned up.
- Make sure the TV is set to the correct source (usually AV).
Lyrics do not appear on the TV
- Make sure the TV is set to the correct source (usually AV).
- If you are playing a disc, make sure it is a CD+G disc.
- If you are playing from USB, make sure the file is an MP3+G karaoke file.
- Nothing will display on the TV when using Line-In or Bluetooth.
Files on the USB drive will not play
- Try a different file (the file may be corrupted).
- Make sure the file type is supported by the karaoke machine.
- Try a different USB drive.
No sound from the microphone
- Make sure the microphone is firmly connected to MIC 1 or MIC 2.
- Make sure the microphone ON/OFF switch is set to ON.
- Turn up the Mic Volume.
- Turn up the Master Volume.
- If you still cannot hear the microphone, increase the Echo control to above the mid point.
Bluetooth will not pair or connect
- Make sure Bluetooth is turned on for your phone or tablet.
- Press the PAIR button to restart pairing, then try again.
Bluetooth is connected but you cannot hear music
- Make sure your phone or tablet supports Bluetooth audio (A2DP).
- Turn up the volume on your phone or tablet.
- Make sure the music app is open and playing.
Missing or broken parts
As the SML625BT is a legacy model, we no longer manufacture or stock replacement parts for it. We understand this may be disappointing, and we apologize for the inconvenience.
Microphones
The original wireless microphones for this model are no longer in stock. However, a compatible wired microphone is available for purchase and will work perfectly with your machine.
AC Adaptor
If the AC adapter was missing from the box, you can use a compatible adapter that you already own or purchase a new one from an electronics retailer.
Important: If you choose to use a different power adapter, it is crucial that it meets the following technical requirements to avoid damaging your machine:
- Output: DC 5.8V Current: 1.5A (or higher is also safe)
- Polarity: Center Pin Positive (this is standard, but important to verify)
- Plug Size: Not specified in the provided text.
When searching, using a phrase like "5.8V 1.5A power adapter" should give you relevant results.
Downloads and resources
Still need help?
Contact Singing Machine support:
- Get help quickly via our chat bot — click the chat bubble in the bottom-right of our help page.
- Send us an email by submitting a request here.