Can someone please recommend the correct battery to operate this product

I purchased a 24Vdc@10 amps power supply. A lithium battery supply from parts Express using 5 18650's cells is 21Vdc and would work just fine.

Will it be useful to install a crossover? or is it not necessary?

I have tree of these running Speakers and sub-woofers with no crossover.

does the main volume affect the sub volume or are they completely independent?

The sub volume is not completely independent . I guess it’s kinda like having a gain adjustment on a car stereo amp ..

What is the output wattage using a 12v input at 8 ohms?

12 watts or so. To get 50W you need 24V at about 3.5 amps at 4 ohms.

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🎵 Elevate your sound game—power, control, and protection in one sleek board!

RELIABLE 24 7 SUPPORT - Dedicated customer service ready to assist anytime, ensuring your satisfaction and peace of mind.
PRECISION AUDIO TUNING - Customize your sound with dedicated treble and bass controls for perfect layering.
ROBUST SAFETY FEATURES - Built-in short-circuit, over-current, over-heat, and reverse polarity protections ensure worry-free use.
VERSATILE CONNECTIVITY - Seamlessly connect via Bluetooth, AUX, or USB—compatible with all your devices.
IMMERSIVE 2 1 CHANNEL POWER - Experience crystal-clear stereo with booming subwoofer output for a rich soundscape.

The Bluetooth Power Amplifier Board ZK-MT21 delivers a powerful 2.1 channel audio experience with 50W per stereo channel plus 100W subwoofer output. Featuring the high-performance TPA3116D2 chip, it supports wide voltage input (12-24V) and multiple input methods including Bluetooth, AUX, and USB. With adjustable treble and bass controls, it offers customizable sound layering. Advanced protection mechanisms safeguard the device, while 24/7 customer support ensures reliable service.

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