ZKTB21 TPA3116D2 Bluetooth 5.0 Subwoofer Amplifier Board 2.1 Channel AMP Module DIY Audio BoardsZKTB21 Only

Feature:

【HIFI Stereo】High quality dual channel power amplifier board for HIFI music. With AUX and Bluetooth two audio input methods, 2-in-1. 5.0 Bluetooth version, the transmiion efficiency is higher, the transmiion distance is farther. With a filter inductor, the sound is round and clear. 【Protection Mechanism】Features short-circuit and thermal protection as well as overvoltage, undervoltage, and DC protection to prevent total failure. In the event of an overload, the device reports the fault condition to the proceor to protect itself from damage. 【High Performance】The TPA3116D2 is a Cla D amplifier IC from TI that has very high index parameters. Advanced oscillator / PLL circuit uses multiple switching frequency options to reject AM interference. The modulation frequency can be up to 1.2MHZ, and the high power output distortion is le than 0.1%. This helps prevent noise. 【High Quality】Adopts copper DC connector and fence type terminal. It can withstand large current, no heat, no damage to the wire. Free DC head lead, compatible with the input power interface of this product, even if you dont have a DC head adapter or battery, it can be easily wired. 【Widely Application】With ba, treble and volume control, easy to adjust volume, enjoy the music tone what you want. Be widely used in store solicitation, home theater, square speakers, etc. Due to its excellent performance and comprehensive cost performance.

Specification:

: TPA3116D2 (With AM interference suppereion) Bluetooth Version: 5.0 (Without occlusion 10m) Audio Input: AUX + Bluetooth Channel: 2.1 Stereo Power Supply: 12-24V / 3A above Speaker: 20-100W, 4-8Output Power: Max 50W R&L Channel; Max 100W Subwoofer Protection Mechanism: overheating, undervoltage, overheating, DC detection, short circuit protection

Notice:

- To have enough output power if the audio input is sufficient and the supply voltage/current is sufficient. - The power supply voltage is higher and the relative power will be larger. - The speakers with different impedances will have different output power. - In the case of sufficient voltage and current, the larger thes of the horn, the smaller the relative sound power. - Pls ensure that the power of the adaptor is greater than the actual working power of the amplifier.

Package Contents:

1 x Power Amplifier Board 1 x Related Toolkits 1 x Power Adapter(Only if buy)

Question and Answer:

1. How to choose the power supply? The power supply with the board is very key, the selected power supply ripple must be small, ripple large power supply will lead to power amplifier bottom noise, there is a current sound.The higher the voltage, the higher the current, and the higher the power output. If you only have 12V 1A, you can have 3-4 inch speakers.If you are above 19V 5A, no problem with 8-10 inches, power must be highly valued.If the voltage is too low and the sound is amplified, it will easily cause sound distortion. If the current is too low and the horn cannot be brought up, the voltage will be pulled down, which will lead to abnormal operation or poor sound quality. It is recommended to use 18V19V24V power supply with current above 5A.If you only have 9V12V or 1A 2A power supply, you can also use it but with low power. When using it, choose the volume close to the maximum, which may cause distortion and affect the sound quality. 2. How to select speakers? About the speaker type: commonly used speakers are generally 4-8s, can be used.Speakers in left and right channels need to be connected to full frequency or medium and high frequency speakers with power between 20W and 100W.Subwoofer speakers cannot be connected to ordinary speakers. Speakers with subwoofer speakers should be connected, with power between 20-100W.The subwoofer horn must have a dive frequency of at least 50Hz. If your speaker power is small, such as between 20W-50W can also be used, the power supply voltage needs to be small, to prevent the loudspeaker burnt after loud, such as choose power below 15V.If you are a 50W-100W speaker, you don't have to worry about burning out the horn. You can choose a 12-24V power supply. The higher the voltage you choose, the more sound or power you can output.Speaker power is not easy to exceed 100W, otherwise it will affect the sound quality. 3. Audio input mode There are two audio input modes for this audio amplifier module: one is Bluetooth input and the other is AUX input. Bluetooth mode is preferred.Bluetooth can be connected in either mode.As long as the Bluetooth connection is succeful, it is bluetooth mode, and bluetooth mode supports automatic back up.AUX insert is AUX mode when Bluetooth is disconnected.It should be noted that the bluetooth connection of this module is disconnected when using AUX mode. 4. How to adjust the main volume? The MAIN - VOLUME knob is used to adjust the MAIN VOLUME.The right main volume goes up and the left main volume goes down.The master volume affects both the left and right channels and the subwoofer volume. 5. How to adjust the height and ba of the left and right channels? R&L CHANNEL - Bknob is for BASS, right-handed Benhancement, and left-handed Battenuation.When the knob is in the right-most position, it does not enhance or attenuate the ba. The R&L CHANNEL - TREBLE knob is used to control the TREBLE, with right-handed TREBLE enhancement and left-handed TREBLE attenuation.When the knob is in the middle, it does not enhance or attenuate the treble. Note when adjusting high and low sounds: when the TREBLE or Bsounds are right-rotated to near maximum, if the sound distortion is distorted, the gain of the TREBLE or Bsounds is too large. It is neceary to turn the TREBLE or Bknob to the left to lower the gain or turn the MAIN-VOLUME knob on the right to the left to reduce the total VOLUME. 6. How to adjust the subwoofer? SUBWOOFER - VOLUME controls the VOLUME of the SUBWOOFER.The right-handed volume goes up and the left-handed volume goes down. The SUBWOOFER - FREQ knob controls the cutoff frequency of the SUBWOOFER.The right frequency increases and the left frequency decreases.The frequency adjustment range is 20HZ-200Hz. 7. It's ok to have a small voice, but after the voice becomes louder, there will be the phenomenon of sound turbidity. The sound is distorted, please turn down the total volume or change the adapter to a higher voltage level. 8. It's ok to have a small voice, but when the voice gets louder, there will be the phenomenon of sound lag. If the input power is insufficient and the power is protected by its own intermittent power failure, please replace the power with a more powerful one.Or the power is too big, the power amplifier heating seriously, appeared the heat protection situation, reduce the power use or strengthen the heat diipation. 9.What factors are aociated with sound quality? The quality of sound is not only related to the power amplifier module, but also to the power supply, sound source and the whole sound system.Basically every link of the sound system will affect the sound quality, among which the main link is the audio transmiion line, audio power supply, tone circuit, amplifier circuit, speakers and the surrounding envment.The sound quality is best when the sound source, power supply, amplifier module and the speaker are matched.

About shipping
Shipping and Packaging All itwill be double checked and well packed before sending.Itwill be dispatched within 2 business days after buyers pay for the order. It usually takes about 14 to 18 working days for delivering the package to the destination(for remote areas,it may take a little longer). 

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