B Series：B428DSP / B628DSP / B828DSP

Newly designed small ultra-low power mixer, compact and reasonable panel layout contains many functions. Multi-channel mic input and a variety of audio input modes, AUX send and return, independent monitoring system, 99 modes of DSP effect processor, independent Bluetooth player, MP3 recording/player /USB soundcard, etc. Superior sound quality, high cost performance, can meet the majority of small and medium-sized sound amplification combination and places.

● High quality, low noise, high headroom audio mixer

● Extremely low distortion, high dynamic response, and rich musical, wide range gain of low noise pre-amp

● A variety of input options: 8/6/4 mic input +3 groups of stereo input

● Mic input channels with gain control, signal indicator lamp, 3-band tones, low cut filter, left and right audio-visual distribution key, Aux and effect sending, monitoring control and volume adjustment functions, XLR port provides +48V phantom power supply

● A group of stereo input channels with gain adjustment, signal indicator light, 3-band of tone, left and right audio and video distribution, Aux sending and effect sending, monitoring control and volume adjustment functions. The other two groups of stereo input channels are with volume adjustment, signal indicator and Aux sending button function

● Independent monitoring and signal level display

● Aux sending output and stereo return

● Precise 3-color, 6-band LED level display

● 24 bit, 48KHz sampling DSP digital effects processor, 99 kinds of effects, each parameter is adjustable

● Digital tube display stereo MP3 player/recorder, compatible with USB 1.1 audio interface standard, can be connected to the computer for audio signal recording or playback

● Independent bluetooth player, one key pairing, easy to use

● High quality and high precision fully sealed potentiometer, durable to use

● Less volume, more features, more concise, convenient and easy to use

● External high efficiency switching power supply adapter, low power consumption design

General Specifications

Maximum input level: MIC +10dBu / Line +22dBu;
Maximum output level: XLR +22dBu;
                                     TRS +20dBu
Master meters: 6 segment -20dB to peak！;
Channel meters: 1 LED signal indication;
Frequency response: 20Hz to 22KHz ±1dB;
CMRR（MIC 1kHz）: ＞75dB;
THD+N : <0.05% (Channel to mix out);
Crosstalk (at 1kHz: Fader shutoff) : ＞80dB;
Noise, (rms 22Hz to 22KHz) : EIN -122dBu / 
                                                Residual output noise ＜-86dBu;
                                                L/R main mix noise ＜-72dBu;
Mono channel : XLR balanced, pin2 hot/pin3 cold, 2K ohm,  Sensitivity -60 to +10 dBu, 
                          phantom +48V;
                          TRS balanced, tip hot/ring cold, 10K ohm, Sensitivity -20 to+20 dBu
MONO channel EQ:  HF，shelving，+/-15dB，12KHz; 
                                  MF，peak/dip，+/-15dB，2.5KHz; 
                                  LF，shelving，+/-15dB，80Hz;
Stereo channel-1 : TRS unbalanced, tip hot, 20K ohm, Sensitivity -20 to+20 dBu
Stereo channel-1 EQ:  HF，shelving，+/-15dB，12KHz; 
                                     MF，peak/dip，+/-15dB，2.5KHz; 
                                     LF，shelving，+/-15dB，80Hz;
Stereo channel-2/3: 6.35mm TRS unbalanced, tip hot, 10K ohm, Sensitivity -20 to +14 dBu;
                                3.5mm TRRS unbalanced, tip/L,ring1/R, ring2/GND, sleeve/output,
                                10Kohm, Sensitivity -20 to +14 dBu;
DSP audio effects processor: 99 mode/24bit/48KHZ, LED display;
MP3 player/recorder: Audio decoding: MP3/WAV/APE/FLAC;
                                                             LED display;
                                                             USB 1.1 audio interface
Bluetooth: Compliant with Bluetooth V5.1+BR+EDR+BLE specification;
Max input power : DC 5V/2A 10watts;