Is the subwoofer frequency knob an adjustable low-pass filter?

Yes frequency and gain aka volume separate from volume for everything..aswel as a slider volume so you can set the max anyone can turn the volume up..so they don't blow ..

If I was hook this up in my vehicle with about 13.6vdc-14.1vdc and 50-60amps then will it work or blow? If it’ll work then how many watts/channel???

I had the slightly weaker version setup in my vehicle. I wired the front speakers to the two speaker channels, and ended up wiring my rear 6x9s in series and wired those to the subwoofer channel. You must be careful with impedances if you do this to make sure you don't blow your speakers. But doing this gave me very good sound for not having an actual subwoofer. A dedicated, high power amplifier will have way more bump for an actual subwoofer, however, if you're ok with the idea of using your rear fill as a stand-in subwoofer, wire it up how I described and it'll sound pretty good. I also used a DC-DC buck converter to step my vehicle's 12-14V DC up to the optimal power level for the amplifier. They're all over amazon just search the input power by the output power and the amp rating and you'll be good to go.

Fuente recomendable para este equipo?

¿Quieres decir qué tipo de energía necesita? La fuente de alimentación de 12V-36V / (5-15A) DC puede impulsarlo. Si desea obtener una entrada de alta potencia, primero debe aumentar el voltaje de entrada o reducir la impedancia del altavoz.

To run a 4ohm sub and 4 ohm speakers what ah should I get for the 36v power supply?

This need depends on your needs, if your speaker power is relatively large, then it is recommended to use 36V. If the power of the speaker is not very large, the 24V DC power supply can also drive your speaker.

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ZK-HT21

Product ID: 382080504

Details

Item dimensions L x W x H
4.76 x 3.93 x
Manufacturer
DAJUNGUO
Maximum Supply Voltage
30 Volts (DC)
Minimum Supply Voltage
12 Volts (DC)
Mounting Type
Surface Mount

🔊300W peak power output

🔋12-30V wide voltage range

🎚️Independent treble & bass control

21.86 OMR

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Description

🎵 Elevate your sound game with power and precision — don’t just listen, experience!

RELIABLE SUPPORT - 24/7 customer service ensures your amplifier keeps performing at its best.
SEAMLESS CONNECTIVITY - Supports Bluetooth, AUX, and USB inputs to effortlessly link all your devices.
BUILT IN SAFETY SHIELD - Advanced protections guard against short-circuit, over-current, and overheating.
POWERHOUSE PERFORMANCE - Delivers a robust 100W×2 + 200W subwoofer output for immersive sound.
TAILORED AUDIO EXPERIENCE - Fine-tune your sound with dedicated treble and bass controls for perfect layering.

The ZK-ST21 TPA3221 Bluetooth Power Amplifier Board is a compact yet powerful 2.1 channel audio module delivering up to 300W total output (100W×2 + 200W subwoofer). It operates on a wide 12-30V DC input, supports multiple inputs including Bluetooth, AUX, and USB, and features adjustable treble and bass controls for a customized audio profile. Equipped with comprehensive protection mechanisms and backed by round-the-clock customer service, it’s designed for high-fidelity sound enthusiasts seeking reliable, versatile amplification.

Specifications

ASIN	B0CXX7TG5V
Best Sellers Rank	#28,476 in Electronics ( See Top 100 in Electronics ) #152 in Audio Component Amplifiers
Brand	DAJUNGUO
Brand Name	DAJUNGUO
Customer Reviews	3.9 out of 5 stars 17 Reviews
Included Components	amplifier board
Item Dimensions	4.76 x 3.93 x 0.98 inches
Item Weight	290 Grams
Item dimensions L x W x H	4.76 x 3.93 x 0.98 inches
Manufacturer	DAJUNGUO
Maximum Output Power	300 watts
Maximum Supply Voltage	30 Volts (DC)
Minimum Supply Voltage	12 Volts (DC)
Model	ZK-ST21
Mounting Type	Surface Mount
Number of Channels	2
Output Power	200 Watts
Part Number	ZK-HT21
Supply Current	10 Amps
UPC	194852393783

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