B877 3-Channel Personal Listener Headphone Mixer

Product information
1. LINEPAUDIO B877 personal listener. Designed for musicians who want to listen to their voices through headphones or earphones, as well as their vocal and musical instruments, mainly for drummers, who need to mix click tracks with listening signals. Church choir singing and others need to listen to the sound of their music. All 3 channels stereo desktop headphone mixer with personal monitor,
2. Three input channels are output from 1/4 and 1/8 (6.5 and 3.5mm) headphone holes through various level controllers, and the microphone channel and device output are connected to ground switches. Easy to eliminate current ground hum. This product is the ideal choice for live bands and church musicians, as well as studio musicians and singers. It has the ability to customize the main music and vocal and instrumental input of musicians. Make the product an effective and multifunctional listening device.
3. Line Input: 1/4 TRS stereo jack for connecting line level signal sources, such as mixer listening/aux output, cassette player output, CD player output and so on.
4. Ground connection: Connect the jumper to disconnect the microphone pin 1 chassis ground input and the microphone passes through.
5. The Microphone: The XLR jack is in parallel with the microphone input jack (wired) to be sent to the mixer or other microphone-level input device.
6. Microphone Input: Balanced XLR jack for connecting condenser or moving coil microphones.
7. Device Input: 1/4 TRS stereo jack for connecting devices or line level signals, such as guitar processors, keyboards, musical instruments, keyboards or previous musical instrument outputs.
8. Mono / Stereo Jumper: Selects whether the Jack input is mono or stereo.
9. Left/Right Output: Transformer balanced XLR output from device input.
10. Ground Path: A plug jumper used to disconnect the chassis from the 1/4 RS device output jack.
11. Mono/Stereo Jumper (located below the line input): Selects whether the line input jack is mono or stereo.
12. Note: The XLR jack interface in MONO mode can be used for the phantom power needed to connect the mixer.
13. Headphone output: 1/4 stereo jack and 1/8 stereo jack for connecting stereo headphones or earphones.
14. Line Level: Adjusts the signal level from the line input to the headphone mix.
15. Microphone Level: Adjusts the signal level from the microphone input to the headphone mix.
16. Inst. Level: Adjusts the signal level from inst. input to the headphone mix.
17. The line input is connected to a 1/4 stereo or mono plug. If the plug is 6.35mm stereo, select the mono/stereo jumper setting from stereo. The plug is a single-ended mono channel. Select the mono/stereo jumper settings.
18. The microphone input connects to a dynamic or capacitive microphone via a standard XLR cable. If you are using a capacitive microphone, you must charge it with power from the mixer connected to the microphone jack. This jack transmits phantom power from the mixer to the microphone. Connect the microphone via the jack to the mixer as needed.
19. The instrument input connects to the guitar preamp output, keyboard, or any stereo or mono instrument signal. Select stereo or mono.

Characteristics
1. Maximum input level: -20 dB XLR, line +40 dB, instrument +15 dB.
2. Input impedance: 50K ohm
3. Output frequency response: 10-30kHz +/- 3dB
4. HDPHN output impedance: 10 ohm
5. Output impedance: 2 ea; 100ohms balanced
6. Gain: 20dB 1/4 inch, 50dB XLR
7. HDPHN Frequency Response: 20Hz-20kHz
8. S/N ratio: 90dB
9. Power supply: DC 9-16V
10. 1/4 TRS stereo/mono listening input.
11. XLR microphone comes in with pass-through.
12. 1/4 TRS stereo instrument input, 6.35mm/3.5mm stereo/mono output.