The DAS Series A1 Product Is Equipped With A High-Performance Adau1701 Chip. It Is A Complete Single-Chip Audio System With 28/56-Bit ADC, Resolution And Calculation Accuracy. It Has An Extremely High Signal-To-Noise Ratio. The Adc Is 100DB And The Is 104DB. Users Can Adjust Parameters Of The Audio System Through The Potentiometer Or App, Including Gain, Left And Right Gain Balance Fine-Tuning, High-Pass/Band-Pass Filtering, Total Volume, Stereo Volume, Subwoofer Volume, Etc. Board Mode - Five Knobs To Adjust, Namely Total Volume, Stereo Volume, Stereo Treble, Subwoofer Volume, And Subwoofer Frequency. Revisit The Classic Three-Stage Tone, With On-Board Potentiometers For Digital Adjustment Of Treble And Bass Frequencies. Compared With Analog Tuning, There Is No Carbon Brush Friction And Contact Noise, And There Is No Need To Consider Shielding Issues. Single-Gang Potentiometers Are Easier To Adapt And Less Difficult. There Is An Imbalance Between Left And Right. The Digital Adjustment Curve Is More perfect, And There Is No Need To Worry About One Thing And Lose Another. Eq Mode - Only The Main Volume Knob Is Effective. The Volume Of The Stereo And Subwoofer Is Set By The App. The 10-Band Eq Is Adjusted By The App. All Parameters Are Automatically Memorized After Being Set. Filter Mode - Only The Master Volume Knob Is Effective. Stereo And Subwoofer Filter Gains And Cutoff Frequencies Are Set By The App. All Parameters Are Automatically Memorized After Being Set. Product name:DSP21 channel Bluetooth power amplifier board 160W+160W+220W Adaptable power supply:Working voltage range 15-36VDC. (It is recommended to use a DC power supply with a voltage of 24-32V and a current of more than 8A) Maximum power: Left or right channel - 160W@36V, 4ohm; 65W@32V, 8ohm; 36W@24V, 8ohm Subwoofer - 220W@36V, 3ohm;125W@32V, 4ohm; 70W@24V, 4ohm (In short, the higher the voltage, the smaller the resistance, and the greater the output power) Bluetooth chip: 51, transmission distance 15 meters Input :Bluetooth+AUX+U disk/sound card Number of channels:2.1, left and right channels + subwoofer Power amplifier chip:two TDA7498E Protection mechanism:overheating, overcurrent, short circuit protection, input anti-reverse connection Standby power consumption:30mA Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Type:A:External Colour:As Shown Material:PCB Package Contents: 1 * Potentiometer External Bluetooth Power Amplifier Board Module 1 Set * Potentiometer Knobs (With Wire) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.