DIYSOUND ZK-502L Mini Amplifier with Bluetooth Subwoofer Bluetooth Amplifier Board Wireless Audio Digital Power

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No screwdriver, no box

😻Product Includes😻

1 x Audio Amplifier Board

1 x DC Cable Head

✅Model: ZK-502L

✅Bluetooth version: 5.0

✅Material: fiberglass board and electronic components

✅Size: about 55 x 38 x 17 mm / 2.17x 1.50 x 0.67 inches

✅Adjustable voltage: 5-24V (optional adapter 9/12/15/18/24V recommended high voltage)

✅Speaker adapter: 30-200W, 4Ω, 8Ω

✅Number of channels: left and right stereo (stereo)

✅Bluetooth transmission distance: 15m (unobstructed)

✅Protection mechanism: self-recovery overheat protection, self-recovery short circuit protection

✅Color: as shown in the picture

✅Quantity: 1 piece

🔥100% brand new product, high quality🔥

Bluetooth 5.0 version has high fidelity, two-channel stereo sound quality, higher efficiency and longer transmission distance.

Capacitor 470uf 35V solid-state capacitor guarantees energy storage and heat dissipation, and stable power supply is the prerequisite for good sound quality.

Adopt copper DC connector, which can withstand large current without heating.

Free DC head is compatible with the power input interface of this product, even if you don't have a DC head adapter or battery, you can easily connect it.

It also has a volume adjustment function, rotating the sound potentiometer clockwise to amplify, and rotating counterclockwise to reduce the sound.

Suitable for DIY speakers.

🔥Notes:

Provide sufficient power when the audio input is sufficient and the power supply voltage/current is sufficient. The higher the power supply voltage, the greater the relative power. Speakers with different impedances have different output powers. When the voltage and current are sufficient, the larger the ohm of the speaker, the smaller the relative sound power. Please note!

🔥Voltage:

12V - 8 ohm speaker/12W (left channel) +12W (right channel), 4 ohm speaker/20W+20W

15V-8 ohm/18+18W, 4 ohm/30+30W or more

19V - 8 ohm/32+32W, 4 ohm/45+45W or more

24V - 8 ohm/38+38W, 4 ohm/50+50W or more

🔥Precautions for use:

The power switch on the board is a standby switch. After turning off the power, the machine will be in low-power standby mode. Turn off the machine completely or unplug the DC plug on the machine for a long time.

Questions and Answers:

✅1. How to choose a power supply?

The power supply of the circuit board is very important. The higher the voltage, the greater the current, and the better the output power. If you only have 12V 1A, you can bring a 3-4 inch speaker. If you are 19V 5A or above, 8-10 inches is fine. The power supply must be high-value. If the voltage is too low, the sound will be distorted after amplification. If the current is too small, the speaker will pull down the voltage and work abnormally, otherwise the sound quality will deteriorate.

It is recommended to use an 18V19V24V power supply with a current of more than 3A. If you only have a 9V12V or 1A 2A power supply, you can also use it. But the power is very small. Please pay attention to the maximum volume when using it, which may affect the sound quality.

✅2. How to choose a speaker?

1、Generally speaking, the commonly used 8-ohm speaker cannot distinguish between positive and negative poles, and the same effect can be achieved with a 4-ohm speaker.

2、If your speaker has a small output power, it may be between 10W-30W, and the power supply voltage is smaller to prevent the amplifier from being burned out after burning. For example, choose a power supply lower than 15V.

3、If you have a 50W-200W speaker, don't worry about speaker fatigue. You can choose a 12-24V power supply. The higher the voltage you choose, the greater the output sound or power.

✅3. How to connect Bluetooth?

Turn on the amplifier, connect the speaker, turn on the blue sound button, open the phone settings-Bluetooth-search "BT-WUZHI", and then click Connect. There will be a beep when the connection is successful. At this time, it is in Bluetooth mode and can play music. The next time you turn it on, it will automatically connect to the phone.

✅4. When the sound gets louder, the sound becomes muddy.

If the sound is distorted, please replace the adapter power supply with a higher rated voltage.

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