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

🔋12V-24V wide voltage input

🎚️Adjustable treble & bass control

€ 36.44

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Sold byAmazon GreeceDelivered 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 Greece.

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Description

🎵 Elevate your sound game—because your playlist deserves premium power!

PRECISION AUDIO TUNING - Customize your sound with dedicated treble and bass knobs for rich, layered audio.
UNIVERSAL CONNECTIVITY - Seamlessly connect via Bluetooth, AUX, or USB—compatible with all your favorite devices.
ROBUST SAFETY PROTECTIONS - Built-in short-circuit, over-current, over-heat, and reverse polarity safeguards keep your gear safe 24/7.
IMMERSIVE 2 1 CHANNEL POWER - Experience crystal-clear stereo with booming 100W subwoofer bass for a next-level soundscape.
COMPACT LIGHTWEIGHT DESIGN - Sleek 4.37x4.05 inch board weighing just 130g—powerful audio without the bulk.

The ZK-MT21 Bluetooth Power Amplifier Board delivers a powerful 2.1 channel output with 50W per stereo channel plus a 100W subwoofer, powered by the high-efficiency TPA3116D2 chip. Supporting 12-24V input, it offers versatile connectivity options including Bluetooth, AUX, and USB, alongside adjustable treble and bass controls for personalized audio. Engineered with multiple protection features, this compact amplifier ensures reliable, high-fidelity sound for any audio setup.

Specifications

ASIN	B09HKB44JQ
Best Sellers Rank	#25,236 in Electronics ( See Top 100 in Electronics ) #122 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
Unit Count	1 Count
Voltage	20 volts

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TrustScore 4.5 | 7,300+ reviews

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€ 36.44

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered 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 Greece.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Khalid Z.

Great experience from order to delivery. Highly recommended!

1 week ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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