How to use this for karaoke?

No. Buy a karaoke machine that’s what you use for karaoke.

What is the acceptable dc offset for this amp? the one amazon just sent me has 17mv on left channel and 72mv on right. on a class a that's too much!

At your DC offset values you are still in the spec of max offset voltage of Tripath TA2020-020, which is 150mV. (you can google for a spec sheet) Your amplifier is fine and should play nicely. ( My own personal K2020A+ has 15 and 102mV DC offsets.) That being said, there is more to say about DC offsets: The K2020A+ utilizes the standard Tripath circuit board design. There have been many mods developed over the years that have improved on the original design, If you are adventurous, you can google these 2020 mods, and also especially search on diyaudio forum online, you will see some mods address the common variance in DC offsets that yours has, but again, your amplifier is fine and within the Tripath Specs. Note: Obviously modding the amplifier will void the manufacturer's warranty.

Is it just mine or does the power supply not seem to plug in all the way , it works but it’s sloppy

Mine didn't plug up either, I was going to replace. I notice its not 12V 5A. Its 125V I hope it didn't blow it up. I put Netgear 12V5A. & lite came on.

Use with 16 ohm speakers?

If it will power 8ohm it will power 16 ohm speakers. Just won't be as loud. I own one powering a pair of 8 ohm bostons.

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Kinter K2020A+ Limited Edition Original Tripath TA2020-020 Class-T Hi-Fi Audio Mini Amplifier with 12V 5A Power Supply Black

Kinter K2020A+ Limited Edition Original Tripath TA2020-020 Class-T Hi-Fi Audio Mini Amplifier with 12V 5A Power Supply Black

Product ID: 260866574

Details

Item dimensions L x W x H
12 x 14.7 x
Manufacturer
Kinter
Maximum supply voltage
12 Volts
Minimum supply voltage
12 Volts
Voltage
12 Volts

⚡12V 5A Stable Power Supply

🔊20W Class-T Hi-Fi Power

🖤Sleek Limited Edition Black Finish

Description

🎶 Elevate your sound game with sleek power and exclusive vibes!

COMPACT STYLISH - Minimalist black design fits seamlessly into any modern workspace or home setup.
GLOBAL COMPATIBILITY - Designed for international use with adaptable features for worldwide audiophiles.
PLUG PLAY SIMPLICITY - Comes with a reliable 12V 5A power supply for instant, hassle-free setup.
PURE CLASS T AUDIO POWER - Experience crystal-clear 20W output with Tripath TA2020-020 tech for audiophile-grade sound.
LIMITED EDITION EXCLUSIVITY - Own a rare piece of audio tech that stands out in both performance and style.

The Kinter K2020A+ Limited Edition is a compact Class-T Hi-Fi mini amplifier powered by the renowned Tripath TA2020-020 chip, delivering 20W of high-fidelity audio. It includes a stable 12V 5A power supply and features a stylish black finish, making it a perfect blend of performance and design for discerning audio enthusiasts worldwide.

Specifications

ASIN	B077Z7DBRT
Brand Name	Kinter
Customer Reviews	4.4 4.4 out of 5 stars (1,299)
Item Dimensions	12 x 14.7 x 4.2 centimeters
Item Weight	454 g
Manufacturer	Kinter
Maximum Supply Voltage	12 Volts
Minimum Supply Voltage	12 Volts
Model	K2020A+
Mounting Type	Surface Mount
Number of Channels	2
Package Type Name	Box
Part Number	K2022A+
UPC	651814994414
Voltage	12 Volts

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