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

₨628

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Description

🎵 Elevate your sound game — don’t just listen, dominate the vibe!

SEAMLESS CONNECTIVITY - Effortlessly connect via Bluetooth, AUX, or USB for ultimate device compatibility.
TAILOR YOUR SOUNDSCAPE - Fine-tune highs and lows with dedicated treble and bass controls for a personalized audio vibe.
BUILT TO PROTECT PERFORM - Advanced safeguards including short-circuit, over-current, and thermal protection keep your setup safe 24/7.
COMPACT VERSATILE DESIGN - Lightweight and surface-mountable, this amplifier fits perfectly into any modern audio setup.
POWER PACKED AUDIO PERFORMANCE - Experience crystal-clear sound with 50W×2 stereo channels plus a booming 100W subwoofer output.

The ZK-MT21 Bluetooth Power Amplifier Board delivers a robust 200W output (50W×2 + 100W subwoofer) powered by the high-efficiency TPA3116D2 chip. Supporting 12-24V input, it offers versatile connectivity options including Bluetooth, AUX, and USB, plus customizable treble and bass controls. Engineered with multiple protection features, this compact amplifier ensures reliable, high-fidelity audio performance for any professional or home setup.

Specifications

ASIN	B09HKB44JQ
Best Sellers Rank	#33,475 in Electronics ( See Top 100 in Electronics ) #177 in Audio Component Amplifiers
Brand Name	DAJUNGUO
Customer Reviews	4.4 out of 5 stars 447 Reviews
Included Components	amplifier board
Item Dimensions	4.37 x 4.05 x 1.02 inches
Item Weight	130 Grams
Item dimensions L x W x H	4.37 x 4.05 x 1.02 inches
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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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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₨628

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

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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