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

🎚️Adjustable treble & bass control

₨625

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

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Description

🎵 Elevate your sound game — don’t just listen, experience every beat!

RELIABLE SUPPORT 24 7 - Dedicated customer service ready to assist anytime, ensuring your investment is worry-free.
BUILT IN SAFETY SHIELD - Advanced protection against short-circuit, over-current, over-heat, and reverse polarity ensures durability.
UNIVERSAL CONNECTIVITY - Seamlessly connects via Bluetooth, AUX, or USB for ultimate device compatibility.
POWER PACKED PERFORMANCE - Delivers a robust 50W×2 + 100W subwoofer output 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 is a compact yet powerful 2.1 channel audio module delivering 200W total output (50W×2 + 100W subwoofer). It supports a wide voltage range (12-24V) and multiple inputs including Bluetooth, AUX, and USB, making it compatible with most modern devices. Featuring adjustable treble and bass controls, it offers customizable sound layering. Built-in protections safeguard the device from electrical faults, backed by responsive 24/7 customer support.

Specifications

ASIN	B09HKB44JQ
Best Sellers Rank	#29,928 in Electronics ( See Top 100 in Electronics ) #150 in Audio Component Amplifiers
Brand Name	DAJUNGUO
Customer Reviews	4.4 4.4 out of 5 stars (447)
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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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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₨625

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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