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 stereo channels

🔋12-24V wide voltage input

🎚️Treble & bass adjustable

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Description

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

24 7 CUSTOMER SUPPORT - Dedicated after-sales service ready to assist anytime, ensuring your amplifier keeps rocking without a hitch.
ROBUST SAFETY FEATURES - Built-in short-circuit, over-current, over-heat, and reverse polarity protections ensure reliable, worry-free performance.
UNIVERSAL CONNECTIVITY - Seamlessly connect via Bluetooth, AUX, or USB—compatible with phones, TVs, laptops, and more for effortless audio streaming.
POWER PACKED STEREO OUTPUT - 50W×2 + 100W subwoofer delivers immersive 2.1 channel sound that fills your space with clarity and punch.
CUSTOMIZABLE SOUND EXPERIENCE - Fine-tune your audio with dedicated treble and bass controls to create the perfect layered soundscape tailored to your vibe.

The ZK-MT21 Bluetooth Power Amplifier Board is a compact, high-performance 2.1 channel audio module featuring a TPA3116D2 HIFI chip. It delivers 50W per stereo channel plus 100W to a subwoofer, supports 12-24V input, and offers versatile connectivity options including Bluetooth, AUX, and USB. With adjustable treble and bass controls and comprehensive protection mechanisms, it’s engineered for superior sound customization and durability, making it ideal for professionals seeking premium audio enhancement.

Specifications

ASIN	B09HKB44JQ
Best Sellers Rank	#42,424 in Electronics ( See Top 100 in Electronics ) #240 in Audio Component Amplifiers
Brand Name	DAJUNGUO
Customer Reviews	4.4 4.4 out of 5 stars (452)
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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B/.52

Duties & taxes included

In stock

Sold byAmazon PanamaDelivered 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 Panama.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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