Description
Parameters:Product Name: 2.1 channel audio amplifier module with ToneProduct Model: ZK-HT21BT Version: 5.0 (no shielding, 15 meters)Audio Input: AUX + BT + USB (Dial wheel button toggles song and mode)Channel: 2.1 (Left channel + right channel + subwoofer)Chip Solution: TDA7498EAdaptive power supply: DC 15~36 V (Under voltage protection below 9V, and 12V power supply can also be supported)Adapter Speaker: 30-200W, 4-8?Output Power: Max 160W @ R&L channelMax 220W @ subwooferProtection Mechanism: Anti reverse connection, undervoltage, overheating, overcurrent, short circuit protectionProduct Size: 145*126*28mmProduct weight: net weight 327g, package weight 395gTip: when the audio signal input is large enough and the power supply voltage / current is large enough, there will be enough output power!The higher the power supply voltage, the greater the output power, the smaller the horn impedance, and the greater the output power!Please ensure that the power of the adaptive power supply is greater than the actual working power of the power amplifier!
Package includes:
1 x Audio amplifier module kit
FAQ:
1. How to choose a power supply?The power supply for the board is very important. The ripple of the selected power supply must be small. A power supply with large ripple will cause the noise floor of the power amplifier board to become larger, and there will be current noise. The higher the voltage, the greater the current and the more output power. If you only have 12V1A, you can bring 3-4 inch speakers. If you are more than 19V 5A, with 8-10 inches no problem, the power must be highly valued. If the voltage is too low, the sound will be easily distorted after amplification. If the current is too small, the speaker will pull down the voltage and cause abnormal operation or poor sound quality.It is recommended to use a 18V/19V/24V power supply with a current of 8A or more, or a power supply of 32V 10A or more. If you only have a 12V/15V 2A power supply, you can also use it, but the power is small. When using the volume close to the maximum, it may distort and affect the sound quality. If you want to get the maximum output power, it is recommended to use an adapter above 36V10A, 160W~200W4. speaker, turn the volume to maximum.2. How to choose speakers?About the type of speaker: the commonly used speakers are generally 4-8 ohms, which can be used. The left and right channel speakers need to be connected to full-frequency speakers or mid-high frequency speakers, and the power is between 30W-200W. The subwoofer speakers cannot be connected to ordinary speakers, and the speakers with subwoofer speakers need to be connected, and the power is between 50-200W. The subwoofer should have a dive frequency of at least 50Hz.If your speaker power is low, for example, it can be used between 20W-50W, and the power supply voltage needs to be lower to prevent the speaker from burning after amplifying the sound. For example, choose a power supply below 15V. The higher the voltage selected, the greater the sound or power that can be output. Speaker power should not exceed 200W, otherwise it will affect the sound quality.3. Introduction of audio input modeThis audio power amplifier module has three audio input methods: one is Bluetooth input, one is AUX audio input, and the other is U disk input. In Bluetooth mode, if you insert an audio cable or U disk, it will automatically switch to audio input mode or U disk input mode, and Bluetooth mode has the lowest priority. When the audio cable or USB flash drive has been inserted, you can also use the dial button to switch the mode.4. How to adjust the total volume?The MAIN-VOLUME knob adjusts the overall volume. Rotate right to increase the overall volume, and rotate left to decrease the overall volume. The overall volume affects both the left and right channel and the subwoofer volume.5. How to adjust the left and right channel high and low?The R&LCHANNEL-BASS knob controls the bass, right-handed bass boost, left-handed bass attenuation. When the knob is in the middle position, the bass is neither boosted nor attenuated.The R&L CHANNEL-TREBLE knob controls the treble, right-handed treble boost, left-handed treble attenuation. When the knob is in the middle position, the treble is neither boosted nor attenuated.Note: The treble and total volume are adjusted to the maximum at the same time, which will easily cause the protection of the power amplifier and cause the sound to be stuck. Lower the treble or turn the right MAIN-VOLUME knob to the left to reduce the overall volume.6. How to adjust the subwoofer?The SUBWOOFER-VOLUME knob controls the volume of the subwoofer. Turn right to increase the volume, and turn left to decrease the volume.The SUBWOOFER-FREQ knob controls the cutoff frequency of the subwoofer. The right-handed frequency increases and the left-handed frequency decreases. The frequency adjustment range is 20HZ-200HZ. When the right-handed frequency increases, the high frequency part is released, and the sound of the subwoofer will appear louder, which is a normal phenomenon.7. Its okay if the sound is small, but when the sound becomes louder, the sound becomes muddy?The sound is distorted, please turn down the overall volume or change to a power adapter with a higher voltage.8. Its okay if the sound is small. After the sound becomes louder, the sound is stuck?The power of the input power supply is insufficient, and the power supply itself is intermittently powered off for protection. Please replace the power supply with a higher power; or the output power is too large, the power amplifier board is seriously heated, and thermal protection occurs. Reduce the volume or strengthen the heat dissipation.9. What factors are related to the quality of sound quality?The quality of sound quality is not only related to the power amplifier module, but also to the power supply, audio source and the entire audio system. Basically, every link of the audio system will affect the sound quality, among which the main links are the audio transmission line, the audio power supply, the tone circuit, the power amplifier circuit, the speakers and the surrounding environment. The sound quality is the best only when the sound source, power supply, power amplifier module and speakers are matched.
