Does it come with a power cord ?

No, you can use a 19v laptop charger but to get this thing fed what it needs buy a 24v 250watt power supply.

What is the low pass cut off for the subwoofer?

The frequency of the bass channel is 20hz-200hz

Would I be able to hook up a regular speaker to the "subwoofer" channel, if I wanted to individually control the volume of that one speaker?

The answer that specifies your frequency limitations is correct. If you connect a full range speaker, it will not sound good. But you can if you don't care about sound quality, in which case you should just go back under your rock and stay there.

I would want to use this for aux input only. can i set it to default to aux input? or do i have to switch from bluetooth to aux each time i power on?

It comes default in aux , there is no such switch for it , to answer your question in simple words, when you get it just connect the aux to it and don't werry about nothing else.

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50W+50W+100W 2.1 Channel Subwoofer Amplifier Board with Treble and Bass Control, Dual TPA3116 Chip, DC 12-24V, Bluetooth and AUX Inputs, DIY Wireless Speakers AMP Board, Password Free (ZK-TB21)

50W+50W+100W 2.1 Channel Subwoofer Amplifier Board with Treble and Bass Control, Dual TPA3116 Chip, DC 12-24V, Bluetooth and AUX Inputs, DIY Wireless Speakers AMP Board, Password Free (ZK-TB21)

Product ID: 372229617

Details

Item dimensions L x W x H
12 x 10 x 2.2
Manufacturer
DAMGOO
Maximum supply voltage
24 Volts (DC)
Minimum supply voltage
12 Volts (DC)
Voltage
24 Volts

📶Bluetooth 5.0 with 49ft range

🔊200W total output power

🎚️Adjustable treble & bass control

Description

🎵 Elevate your DIY audio game with power, precision, and wireless freedom!

BUILT TO LAST - Robust multi-layer safety protections guard against overheating, voltage spikes, and short circuits.
SEAMLESS CONNECTIVITY - Bluetooth 5.0 and AUX inputs ensure effortless wireless or wired streaming without password hassle.
PLUG PLAY SIMPLICITY - User-friendly interface with clear port icons means zero manual stress—just pure sound.
POWERHOUSE PERFORMANCE - Delivers crisp 50W+50W stereo plus 100W subwoofer output for immersive sound.
TAILORED AUDIO EXPERIENCE - Fine-tune your sound with intuitive treble and bass knobs—cinema vibes at your fingertips.

The ZK-TB21 is a compact 2.1 channel amplifier board featuring dual TPA3116D2 chips delivering up to 200W total output (50W+50W stereo plus 100W subwoofer). It supports Bluetooth 5.0 with a 49-foot transmission range and AUX input for versatile connectivity. Equipped with treble and bass controls, it offers customizable sound tuning. Designed for durability, it includes multiple safety protections such as overheat, overvoltage, and short circuit safeguards. Ideal for DIY wireless speaker projects, it operates on 12-24V DC and comes with a user-friendly interface and 24/7 customer support.

Specifications

ASIN	B089KT3FG9
Brand Name	DAMGOO
Customer Reviews	4.4 4.4 out of 5 stars (976)
Global Trade Identification Number	00194852390263
Included Components	amplifier board
Item Dimensions	12 x 10 x 2.2 centimeters
Item Weight	195 Grams
Manufacturer	DAMGOO
Material Type	Electronic Components
Maximum Supply Voltage	24 Volts (DC)
Minimum Supply Voltage	12 Volts (DC)
Model	ZK-TB21
Mounting Type	Surface Mount
Number of Channels	2
Output Power	100 Watts
Package Type Name	Box with Separate Stand Packaging
Part Number	ZK-TB21
Specification Met	CE, FCC, RoHS, WEEE
UPC	194852390263
Voltage	24 Volts

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