ZK-APTX1 2.1 Channel Bluetooth Amplifier Board 100Wx2+200W Subwoofer Theater HiFi Stereo Equalizer Power Amplifier Board COD

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Description:Parameter:Installing an external antenna (special scenario):Package includes:

What kind of speaker does it come with? How much power is used? Recommend an amplifier? In fact, this is the same question because the three of them are related. I believe that after learning the following knowledge, no matter what kind of amplifier you make, you will calculate the compatibility relationship between the power supply, speaker, and amplifier yourself. 1. According to Ohm's law, power P=U * U/R, the higher the voltage, the smaller the horn resistance and the greater the power; So the final output power is not only related to the power amplifier, but also to the power supply voltage and the resistance of the speaker. According to the formula, if the power supply is 24V and the horn resistance is 4 ohms, then the peak power=24V * 24V/4 Ω=144W, and the effective value (rated power) of a 1 kHz sine wave=24V * 0.707 * 24V * 0.707/4 Ω=72W; The peak power of an 8-ohm horn is 24V * 24V/8 Ω=72W, and the rated power is 24V * 0.707 * 24V * 0.707/8 Ω=36W, If the power supply is 12V and the 8 ohm horn is used, the peak power is 12V * 12V/8 Ω=18W, and the rated power is 12 * 0.707 * 12 * 0.707/8 Ω=9W. Our amplifier's nominal power is the rated power, and later on, it defaults to the rated power. 2. In order to leave sufficient power margin and avoid clipping distortion, it is better to have an amplifier power of 1.5-2.5 times the speaker power. For example, if your single channel speaker is 100W, the corresponding amplifier board's single channel output power should be between 150W and 250W. Speakers can be connected in parallel or series. Two 8-ohm and 50W speakers connected in parallel are equivalent to a 100W4 ohm speaker. It is recommended to choose an amplifier with a typical load impedance value that is the same as the final impedance value of your speaker system. This amplifier generally support 4-8 ohm speakers, while a few high-power amplifiers support 2-8 ohm speakers. If the speaker resistance is too small, the amplifier chip is prone to overcurrent power protection or burning.

4. Many customers have a misunderstanding: the higher the power of the amplifier board, the louder the speaker must be. The answer is uncertain! Real case 3002T (300W+300W) power amplifier. I suspect that this amplifier has a serious false label. The sound is not as loud as other 30W amplifiers, and it is not 300W at all. In comparison, the normal power amplifier gain is 36dB, the speaker is 8 ohms 30W, and the power supply is 24V. According to the formula, the maximum mono output power is 36W; when using the 3002T, the power supply is also 24V, and the speaker is 8 ohms, 150W. However, according to the formula calculation, the maximum output is also 36W, and the gain of 3002T itself is 32dB. The original volume of the small power amplifier was adjusted to 70%, achieving 100% of the volume of the large power amplifier. The problem is clearly not a miscalibration of the amplifier; In this case, a 48V6A or higher power supply should be selected to make full use of its power. Obviously, a 30W small power amplifier cannot support 48V power supply and 300W output.