Will this work with powered subwoofer? Passive suboofer?

A Passive subwoofer would be my recommendation, the passive subwoofer depends on an external amplifier and this would be the external amp. If you use an Active subwoofer; it contains a built-in amplifier and the result would be overpowering the subwoofer and you will get adverse effects

Does the amp have a fuse?

Your question does Not specify your concern for a fuse on the Power input or on the Speaker Output section ? Answer: No fuse at all, the circuit with a 12 VDC 2 amp or above 18~24 VDC Power supply adapter does not get warm at all; it has a very good Audio quality response as well as the Output Power volume for its size. It is an excellent amplifier. with 12VDC supply - 15Watt Output Power up to 24VDC supply - 50Watt Output Speakers Power and the Subwoofer power Output ranges from 20W ~ 100W output Power depending on the Power supply input.

how high does the subwoofer lowpass go? Can i push it up to around 500hz, or does it stop at, say, 150hz?

It can't 500hz, only be used in the range of 20-200hz.

Are the main L&R speakers full-range or high-passed? If they are high passed what is the cutoff frequency?

Both channels are full range, with separate bass/treble controls. I don't know what frequency the controls are biased at.

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MakerHawk Bluetooth Amplifier Board HiFi Stereo 2.1 TPA3116D2 2X50W+100W 12V-24V Audio Power Amplifier Module Bass and Treble Control for Store Home Theater Speakers (ZK-TB21)

MakerHawk Bluetooth Amplifier Board HiFi Stereo 2.1 TPA3116D2 2X50W+100W 12V-24V Audio Power Amplifier Module Bass and Treble Control for Store Home Theater Speakers (ZK-TB21)

Product ID: 226280448

Details

Item dimensions L x W x H
4.65 x 3.94 x
Manufacturer
MakerHawk
Maximum Supply Voltage
24 Volts (DC)
Minimum Supply Voltage
12 Volts (DC)
Voltage
24 Volts

🎵Bluetooth 5.0 & AUX dual input

🔊150W total output power

🔋12V-24V wide voltage range

Description

🎶 Elevate your sound game — because your speakers deserve the upgrade!

ROBUST PROTECTION - Built-in safeguards guard against short circuits, thermal overload, and voltage spikes.
CUSTOMIZABLE AUDIO - Adjust bass, treble, and volume to craft your perfect soundscape.
SEAMLESS CONNECTIVITY - Bluetooth 5.0 and AUX inputs keep your playlists flowing effortlessly.
PLUG PLAY FLEXIBILITY - Compact, easy-to-assemble design with universal DC connector for hassle-free setup.
POWER PACKED PERFORMANCE - Delivers crisp 2x50W + 100W output for immersive HiFi sound.

The MakerHawk Bluetooth Amplifier Board ZK-TB21 is a compact, high-performance 2.1 channel Class D amplifier delivering 150W total power (2x50W + 100W subwoofer). It supports Bluetooth 5.0 and AUX inputs for versatile connectivity, operates on a wide 12V-24V DC range, and features bass, treble, and volume controls. Engineered with advanced protection mechanisms, it ensures durability and clear, distortion-free audio, making it ideal for home theaters, store speakers, and DIY audio projects.

Specifications

ASIN	B08H1N7SSC
Best Sellers Rank	#326,552 in Electronics ( See Top 100 in Electronics ) #1,803 in Audio Component Amplifiers
Brand Name	MakerHawk
Customer Reviews	4.4 out of 5 stars 395 Reviews
Item Dimensions	4.65 x 3.94 x 0.87 inches
Item Weight	195 g
Item dimensions L x W x H	4.65 x 3.94 x 0.87 inches
Manufacturer	MakerHawk
Maximum Supply Voltage	24 volts_of_direct_current
Minimum Supply Voltage	12 volts_of_direct_current
Model	ZK-TB21
Mounting Type	Surface Mount
Number of Channels	2
Number of Items	1
Number of Packs	1
Output Power	150 watts
Package Type Name	box
Part Number	10I34BGJ184YZ
Specification Met	RoHS
Supply Current	5 A
UPC	738582506800
Unit Count	1 Count
Voltage	24 volts

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