How effective (or "good") is the Treble boost ? Have hearing problem, and need much more treble going to my speakers. Thanks

Not that good.Get a more powerful amp.

How can this be a 20x2w + 40w (sub) = 80w amp if it only uses a 36 watt (12vx3a) power supply?

Those are likely max watts per channel assuming not all channels will run at max watts all at once. I think the stat you are looking for is RMS watts and that isnt listed

Will this amp work with a pair of 20 watt 4 ohm speakers?

yes it will work and you have a bass hook up also if you want to use 2:1 2 speaker and 1sub woofer

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ST-838 2.1CH Audio Power Amplifier, RMS 20Wx2+40W Class D Stereo Digital Audio Amp with Subwoofer Output, 80W Mini Subwoofer Amplifier Audio Stereo Bass Amp with DC12V Power Adapter - Silver

Product ID: 806635713

Details

Manufacturer
Mo-gu
Maximum supply voltage
12 Volts (DC)
Minimum supply voltage
11 Volts (DC)
Mounting type
Surface Mount
Voltage
12 Volts

🔊80W total output power

🔌Includes 12V 3A power adapter

🎚️Independent bass, treble & subwoofer controls

R2112

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎵 Small amp, big vibes — amplify your world with precision and style!

SLEEK PORTABLE - Stylish silver aluminum alloy chassis fits seamlessly in cars, homes, or outdoor setups.
COMPACT POWERHOUSE - Mini size packs a mighty 80W punch for immersive sound anywhere.
READY OUT OF THE BOX - Includes premium 12V 3A adapter—no extra purchases needed, just plug and play.
TAILORED AUDIO CONTROL - Separate bass, treble, and subwoofer knobs let you craft your perfect soundscape.
UNIVERSAL COMPATIBILITY - RCA & 3.5mm AUX inputs connect effortlessly to phones, TVs, and more.

The ST-838 2.1CH Audio Power Amplifier delivers a robust 80W output (20Wx2 + 40W subwoofer) in a compact, stylish aluminum alloy case. Featuring independent bass, treble, and subwoofer volume controls, it offers precise sound customization. With versatile RCA and AUX inputs, it seamlessly connects to a wide range of devices. The package includes a reliable 12V 3A power adapter, making it a plug-and-play solution perfect for home, car, marine, or outdoor audio setups.

Specifications

ASIN	B08L6KYTJC
Brand Name	Facmogu
Customer Reviews	4.1 4.1 out of 5 stars (344)
Manufacturer	Mo-gu
Material Type	Aluminum Alloy
Maximum Supply Voltage	12 Volts (DC)
Minimum Supply Voltage	11 Volts (DC)
Model	A18224-MG-US
Mounting Type	Surface Mount
Number of Channels	2
Output Power	80 Watts
Part Number	A18224-MG-US
Specification Met	FCC
Voltage	12 Volts

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