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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Bluetooth Power Amplifier Board with Subwoofer 2.1 Channel 50W×2+100W, 12V-24V Audio Power Amplifier Module with Treble and Bass Control (ZK-MT21)

Product ID: 368986425

Details

Item dimensions L x W x H
4.37 x 4.05 x
Manufacturer
DAJUNGUO
Maximum Supply Voltage
24 volts
Minimum Supply Voltage
12
Voltage
20 volts

🔊200W total output power

🔋12-24V wide voltage input

🎚️Independent treble & bass control

AR$67445

Duties & taxes included

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Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎵 Elevate your sound game—because your audio deserves to be as sharp as your hustle.

24 7 CUSTOMER CARE - Dedicated support ensures your amplifier keeps delivering flawless sound anytime.
ROCK SOLID RELIABILITY - Built-in multi-protection safeguards against short-circuit, over-current, and overheating.
UNIVERSAL CONNECTIVITY - Seamlessly connect via Bluetooth, AUX, or USB—compatible with all your devices.
POWER PACKED PERFORMANCE - 50W×2 stereo channels plus a booming 100W subwoofer for immersive sound.
TAILORED AUDIO EXPERIENCE - Fine-tune your sound with dedicated treble and bass controls for rich, layered audio.

The ZK-MT21 Bluetooth Power Amplifier Board delivers a powerful 2.1 channel output with 200W total power, featuring a TPA3116D2 HiFi chip for ultra-low distortion (THD ≤0.1%). It supports versatile inputs including Bluetooth, AUX, and USB, and offers customizable treble and bass controls. Designed for durability, it includes multiple protection mechanisms and operates on a wide 12-24V voltage range, making it ideal for professional-grade audio setups.

Specifications

ASIN	B09HKB44JQ
Best Sellers Rank	#30,573 in Electronics ( See Top 100 in Electronics ) #152 in Audio Component Amplifiers
Brand Name	DAJUNGUO
Customer Reviews	4.4 4.4 out of 5 stars (448)
Included Components	amplifier board
Item Dimensions	4.37 x 4.05 x 1.02 inches
Item Weight	130 g
Manufacturer	DAJUNGUO
Maximum Supply Voltage	24 volts
Minimum Supply Voltage	12 volts_of_direct_current
Model	ZK-MT21
Mounting Type	Surface Mount
Number of Channels	2
Output Power	200 watts
Package Type Name	Hard Case
Part Number	ZK-MT21
Supply Current	5 A
UPC	194852390669
Unit Count	1 Count
Voltage	20 volts

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