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

🔊50W×2 + 100W subwoofer power

🔋12-24V wide voltage input

🎚️Adjustable treble & bass control

13682 Ft

Duties & taxes included

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Sold byAmazon HungaryDelivered 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 Hungary.

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Description

🎵 Elevate your audio game—because your sound deserves to be legendary!

TAILOR YOUR SOUNDSCAPE - Fine-tune highs and lows with dedicated treble and bass knobs for rich, layered audio.
UNIVERSAL CONNECTIVITY - Seamlessly connect via Bluetooth, AUX, or USB for ultimate device compatibility.
RELIABLE SUPPORT ALWAYS - Enjoy peace of mind with responsive 7x24 customer service ready to assist anytime.
BUILT TO PROTECT PERFORM - Advanced safeguards against short-circuit, over-current, and overheating keep your setup safe 24/7.
IMMERSIVE 2 1 CHANNEL POWERHOUSE - Experience crisp stereo sound with booming 100W subwoofer punch.

The ZK-MT21 Bluetooth Power Amplifier Board delivers a robust 2.1 channel output with 50W per stereo channel plus a powerful 100W subwoofer. Operating on a flexible 12-24V input, it supports Bluetooth, AUX, and USB inputs for versatile connectivity. Featuring precise treble and bass controls, it allows personalized sound tuning. Built-in protections ensure safe, reliable performance, backed by dedicated 24/7 customer support.

Specifications

ASIN	B09HKB44JQ
Best Sellers Rank	#20,115 in Electronics ( See Top 100 in Electronics ) #88 in Audio Component Amplifiers
Brand Name	DAJUNGUO
Customer Reviews	4.4 4.4 out of 5 stars (449)
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
Package Type Name	Hard Case
Part Number	ZK-MT21
Supply Current	5 A
UPC	194852390669
Voltage	20 volts

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TrustScore 4.5 | 7,300+ reviews

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

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13682 Ft

Duties & taxes included

In stock

Sold byAmazon HungaryDelivered 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 Hungary.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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