FX9plus Digital Karaoke Pre-Amplifier With Bluetooth USB DSP Reverb Effect Processor 1. Signal-to-Noise Ratio (LR Channels, 1kHz, 0dB): 90dB 2. Total Harmonic Distortion (THD): 1kHz, -3dB: 0.03% 3. Sensitivity: MIC: 6mV4kΩ; AUX: 280mV30kΩ 4. Frequency Response (MIC): 40Hz-15kHz (+1-6dB) 5. Tone Control (Music Bass): +10dB (100Hz) 6. CenterSubwoofer Channel SNR: 87dB 7. Channel Separation: 75dB 8. Audio Adjustment Range: Music Bass: +-10dB (100Hz); Treble: +-10dB (10kHz) 9. Microphone Adjustment Range: Bass: +-10dB (100Hz); Treble: +-5dB (10kHz) 10. Effects (Dual Echo): Output Level: 2.8VkΩ 11. Microphone Noise Gate Threshold: Trigger Voltage: 3mV; Activation Time: 3s 12. Distortion (1kHz, 30mV): 0.03% 13. Power Consumption: 25W 14. Dimensions: Approx. 48.3 x 16.3 x 4.7cm Features: 1. Equipped with a digital audio DSP chip supporting stereo reverb effects; features independent controls for echo delay, repeat, and highmidlow EQ to meet personalized tuning needs across various scenarios. 2. Built-in feedback suppression circuit with a dedicated one-touch FBX (anti-feedback) switch; quickly identifies and suppresses microphone-induced howling and noise interference to enhance vocal clarity. 3. Supports wireless Bluetooth (BT), USB local playback, optical digital input, and dual AUX analog inputs; fully compatible with playback devices such as smartphones, tablets, computers, and disc players. 4. The rear panel provides outputs for leftright main channels, a center channel, and a subwoofer; it supports multiple frontrear microphone inputs with independent volume fine-tuning, facilitating the setup of a complete sound reinforcement system. 5. The unit's dimensions comply with standard rack-mount specifications and feature a brushed metal front panel. 6. Suitable for a wide range of settings, including stage performances, conference presentations, home karaoke, bars, and corporate events.