1. System Composition and Equipment Functions
(1) Core Equipment
● Touch Screen: Serves as the human-machine interface. Transmits video signals via VGA cable (light purple) and control signals via coaxial cable (purple) to enable song selection.
● Karaoke Jukebox: The control center of the system that stores song resources. Outputs video signals to the TV via HDMI cable (green) and transmits audio signals to the preamp via signal cable (red).
● TV: Displays the song selection interface, lyrics and video content, receiving HDMI signals from the jukebox.
● Wireless Karaoke Microphones: Capture vocal signals and transmit them wirelessly to the preamp for free movement during performance.
● Karaoke Preamp / Processor: The core audio processing unit. Provides reverb, EQ and other vocal effects to optimize singing experience. Connects to the jukebox (input) and power amplifier (output) via signal cables.
● Power Amplifier: Amplifies audio signals processed by the preamp and drives loudspeakers via speaker cables (blue).
● 12-inch Karaoke Loudspeakers (×2): Full-range loudspeakers for music and vocal playback, covering 20–30㎡ rooms with a clear sound field.
2. Signal Flow and Connection Logic
(1) Video Signal Path
Touch Screen → Jukebox (VGA / coaxial control) → TV (HDMI video)to synchronize song selection and interface display.
(2) Audio Signal Path
● Backing Track Signal: Jukebox → Preamp (red signal cable) → Amplifier (red signal cable) → Loudspeakers (blue speaker cable).
● Vocal Signal: Microphone → Preamp (wireless reception & processing) → Amplifier → Loudspeakers, mixed with backing track for output.
(3) Cable Specifications
● Signal Cables (red): Transmit low-level audio signals with low noise and high fidelity.
● Speaker Cables (blue): Transmit high-power audio with low resistance and high conductivity (oxygen-free copper core).
● HDMI Cables (green): Transmit HD video (up to 1080P) with audio return channel.
● Coaxial (purple) / VGA (light purple): Connect touch screen and jukebox for stable control and video transmission.
3. System Advantages and Application Scenarios
● Space Adaptation: Optimized for 20–30㎡ rooms. Symmetrical left-right speaker layout ensures uniform sound field and proper SPL coverage.
● Integrated Functions: Wireless microphones support multi-band switching; preamp with built-in anti-howling algorithm; jukebox supports cloud library updates.
● Easy Installation: Modular design and color-coded cables simplify wiring, enabling fast deployment for home KTV and small entertainment rooms.
4. Technical Highlights
● Preamp Processing: DSP-based digital audio processing provides professional reverb and delay effects, simulating theater-grade acoustics.
● Amplifier Matching: Amplifier power and impedance matched to loudspeakers (amp output ≥ 1.5× speaker rated power) for wide dynamic range and low distortion.
● Wireless Microphones: UHF band with strong anti-interference performance and effective range ≥15 meters for free movement.
This system forms a complete closed loop:Song Selection → Singing → Audio Processing → Sound Output,delivering an immersive karaoke experience for small entertainment spaces.
