Do not set any equalizer and level knob to the maximum position, otherwise it may cause acoustic feedback and damage the speaker Very solidly made and works perfectly I was pleased with how solid this mixer is. Controls function nicely and the electronics are very good. The board has built-in reverb/echo for microphones which can be adjusted for each channel. You can even add it to an instrument input. Bluetooth works great, too. Even has a USB port so you can play music from a USB device. Color-coded knobs for easy operation TFCFL 16 Channel Audio Mixer Professional USB Audio Interface Sound Board Console Desk System Interface Digital USB Computer Phantom Power Stereo DJ Studio Metal+Plastic Black Great economy mixer Great unit for large needs on a budget. Not the best build quality (this thing isn't rugged) but it's better-than-adequate for mixing audio. The MP3 player is the only on-unit one I've found that has extra features like random play, folder browsing, etc.. Sound quality is fine. The VU meters don't actually work except in PFL per channel, which is great to level-set but not having them for the main mixout is not ideal EXCELLENT product Not only is this product excellent, but the CS was exceptional. I contacted them and everything was resolved quickly and with kindness. I fully recommend this product 16-channel Support for external connect a 4000w Amplifier;3 stage equalization regulate,by adjusting knob to adjust the reverb depth and delay effect 6 modes of music Nature, popular, rock, jazz, classical, country;Support to conect with wired/wireless/capacitor microphone, applicable to the family KTV, campus speech, meeting etc Noise (22Hz to 22KHz) equivalent input noise -122dbu, residual output noise < -90dbu;Mono/Stereo channel EQ;High frequency, broom type, +/-15db, 12KHz