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 Volts (DC)
Voltage
20 Volts

🔊200W total output power

🔋12-24V wide voltage input

🎚️Independent treble & bass control

₨633

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Description

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

RELIABLE SUPPORT 24 7 - Dedicated customer service ensures your amplifier stays in top shape anytime.
UNIVERSAL CONNECTIVITY - Seamlessly connects via Bluetooth, AUX, or USB for ultimate device compatibility.
BUILT TO LAST PROTECT - Equipped with short-circuit, over-current, over-heat, and reverse polarity safeguards.
POWER PACKED PERFORMANCE - Delivers a robust 50W×2 + 100W subwoofer output for immersive sound.
TAILORED AUDIO EXPERIENCE - Adjust treble and bass independently to craft your perfect sound profile.

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 independent treble and bass controls, it allows precise sound customization. Built-in protection mechanisms ensure safe, reliable operation, backed by responsive 24/7 customer support.

Specifications

ASIN	B09HKB44JQ
Best Sellers Rank	#21,855 in Electronics ( See Top 100 in Electronics ) #107 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 Grams
Manufacturer	DAJUNGUO
Maximum Supply Voltage	24 Volts
Minimum Supply Voltage	12 Volts (DC)
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 Amps
UPC	194852390669
Unit Count	1 Count
Voltage	20 Volts

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₨633

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

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TrustScore 4.5 | 7,300+ reviews

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