Could I bridge four of these together to get 400W?

You can't bridge 4 of anything, so, no. They are very nice amps, and an amazing bargain. You need 24 VDC at about 4.5 A for full power for each. 100 watts is the 4 ohm rating with adequate power supply. 50 watts max at 8 ohms. They sound very nice, but noisey unless the gain is set very low.

How can I drive this amplifier with a passive guitar signal?

Actually you can run directly from guitar. I just did exactly that.

Can I use these for car audio

Although someone else said these need 24v, that is only if you want to run them at full power. You can run them off 12v but the power output will only be half of the maximum. But there are far better choices for car audio. I would not recommend these for use in a car.

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HiLetgo 2pcs TPA3116 100W Power Amplifier Board DC 12V 24V TPA3116DA Mono Channel Digital Stereo Audio Amplifier Board High Power AMP Module

Product ID: 500057438

Details

Manufacturer
HiLetgo
Maximum supply voltage
26 Volts
Minimum supply voltage
12 Volts
Mounting type
Surface Mount
Voltage
26 Volts

⚡100W peak power output

🔋Wide 12-26V DC voltage range

🎚️Mono channel digital stereo amp

Description

🔊 Power Your Sound, Own the Room

DUAL PACK VALUE - Two amplifier boards included—double your sound potential or build dual-channel systems with ease.
COMPACT YET MIGHTY - Sleek 79x54x16mm footprint fits effortlessly into any custom audio project or upgrade.
UNLEASH 100 W PURE POWER - Experience crystal-clear, room-filling sound with high-efficiency TPA3116D2 chip technology.
FLEXIBLE VOLTAGE COMPATIBILITY - Seamlessly integrates with 12V to 26V power supplies for versatile setups.
PRECISION DIGITAL AMPLIFICATION - Enjoy ultra-low noise (100dB SNR) for pristine audio clarity that impresses audiophiles and pros alike.

The HiLetgo TPA3116 100W Power Amplifier Board is a compact, high-performance mono channel digital amplifier module operating on a 12-26V DC supply. Featuring the advanced TPA3116D2 chip, it delivers up to 100 watts of clean audio power with a 100dB signal-to-noise ratio, making it ideal for professional-grade audio projects and upgrades. This dual-pack offers exceptional value for DIY enthusiasts and audio professionals seeking reliable, high-fidelity amplification.

Specifications

ASIN	B082F7P184
Best Sellers Rank	257,264 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 1,523 in Hi-Fi Amplifiers
Brand	HiLetgo
Customer Reviews	4.2 4.2 out of 5 stars (163)
Manufacturer	HiLetgo
Manufacturer Part Number	3-01-1581
Maximum Supply Voltage	26 Volts
Minimum Supply Voltage	12 Volts
Model Number	TPA3116D2
Mounting Type	Surface Mount
Number of Channels	1
Output Power	100 Watts
Package Type Name	Product Box
Voltage	26 Volts

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