Dual Microphone InterfaceThis sound card has two microphone input interfaces, both of which support MIC (XLR)/LINE (TRS) input, for connecting microphones or digital instruments, providing excellent recording quality, dynamic response and rich bass frequency.RCA Input and OutputThis product provides RCA input and output interfaces, through which you can select more input and output sources, such as input accompaniment. It also provides input accompaniment and microphone volume balance adjustment, as well as internal recording functionUltra-low latency listeningWith a headphone interface, it provides ultra-low latency listening function, and each port has a separate knob control, so you can adjust the appropriate volume at any time Easy to useThis productNo need to install complex drivers, just connect the product to the computer with USB and use it. (Note: If you need to record, you need to download and use the recording software on your computer. This product supports all free recording software and racks) Specifications: MIC INPUT 1-2 (balanced): Frequency response/ -1dB, 20Hz - 20kHzDynamic range: 82 dB, A-weightedTHD+N 0.03%, 1kHzMaximum input level: +6 dBu Input resistance 4 k GainRange: +3dB- +60dBHI-Z INPUT 2 (unbalanced)Maximum input level: +3.0 dBVInput resistance: 1 MGain range: 0dB - +40dBLine In 1/2 (balanced)Maximum input level: +10 dBuInput resistance: 18.5 kGain range: -10dB - +40dBMain output (impedance balanced):Frequency response: -1/-1 dB, 20 Hz - 20 kHzDynamic range: 82 dB, A WeightedTHD + N 0.03%, 1kHz,Maximum input level: +6 dBuInput resistance 100 kHeadphones:Maximum input level: 15 mW + 15 mW, 40USB:Specifications: Full-speed USB 2.0, 24-bit, 44.1kHz/48kHz/88.2kHz/96kHz/176.4kHz/192kHzXLR input:Polarity: 1: Ground 2: Live (+) 3: Cold (-)Power requirement: >5WPlease note:As shown in the figure below:Turn off listen back in the PC mixer, otherwise the sound will repeat and be severely distorted.After turning it off, click: Apply, then click: OK.Settings are complete.No soundVerify that you are using the correct USB cable. Be sure to use the supplied USB cable.Is the volume control of the device set correctly?Check the [OUTPUT] knob and the [PHONES] knob.Are the microphone and speaker properly connected to the device?Refer to the User Manual to confirm that the connection is correct.Is the speaker's power switch turned on?Make sure the speaker's switch is turned on.