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 Audio Amplifier Board DC 12V 24V TPA3116DA Mono Channel Digital Audio Amplifier Board High Power AMP Module

Product ID: 205668795

Details

Manufacturer
HiLetgo
Maximum Supply Voltage
26 Volts (DC)
Minimum Supply Voltage
12 Volts (DC)
Mounting Type
Surface Mount
Voltage
26 Volts

⚡100W peak power output

🔊Mono channel digital clarity

🔋Wide 12-26V DC voltage range

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Description

🔊 Amplify your sound, elevate your space — don’t just listen, experience!

COMPACT EFFICIENT - Sleek 79x54x16mm design fits effortlessly into any audio project or upgrade.
DUAL PACK ADVANTAGE - Includes two amplifier boards for expanded or stereo configurations—double the impact.
VOLTAGE FLEXIBILITY - Operates seamlessly between 12V and 26V DC to fit diverse setups.
POWERHOUSE PERFORMANCE - Delivers a robust 100W output for crystal-clear, room-filling sound.
PRECISION AUDIO CLARITY - TPA3116D2 chip ensures ultra-low distortion with a 100dB signal-to-noise ratio.

The HiLetgo TPA3116 100W Audio Amplifier Board is a compact, high-power mono digital amplifier module operating on a versatile 12-26V DC supply. Featuring the advanced TPA3116D2 chip, it delivers crisp, distortion-free audio with a 100dB SNR, making it ideal for professional and DIY audio enhancements. Sold as a dual pack, it offers flexibility for powerful, immersive sound setups.

Specifications

ASIN	B082F7P184
Best Sellers Rank	#39,639 in Electronics ( See Top 100 in Electronics ) #221 in Audio Component Amplifiers
Brand Name	HiLetgo
Customer Reviews	4.2 4.2 out of 5 stars (166)
Manufacturer	HiLetgo
Material Type	Plastic, Metal
Maximum Output Power	100 watts
Maximum Supply Voltage	26 Volts (DC)
Minimum Supply Voltage	12 Volts (DC)
Model	TPA3116D2
Mounting Type	Surface Mount
Number of Channels	1
Output Power	100 Watts
Package Type Name	Product Box
Part Number	3-01-1581
Unit Count	2.0 Count
Voltage	26 Volts

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TrustScore 4.5 | 7,300+ reviews

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$32.61

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In stock

Sold byAmazon USADelivered 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 USA.

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TrustScore 4.5 | 7,300+ reviews

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

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