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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K2020A+

Product ID: 60293257

Details

Item dimensions L x W x H
4.72 x 5.79 x
Manufacturer
Kinter
Minimum Supply Voltage
12 Volts
Mounting Type
Surface Mount
Voltage
12 Volts

⚡20W x2 output power

🔌12V 5A included power supply

🎛️Bass & Treble tone controls

Description

🎧 Small amp, big vibes — power your space with precision and style!

PLUG PLAY READY - Includes a robust 12V 5A power supply for instant setup and reliable performance.
COMPACT POWERHOUSE - High-efficiency Tripath TA2020-020 chip delivers clean 20W per channel sound without bulk.
PREMIUM CONNECTIVITY - Gold-plated RCA and improved speaker connectors ensure superior signal clarity and durability.
LIMITED EDITION ALERT - Scarce stock means owning this amp sets you apart—don’t miss out on elevating your DIY audio game.
PRECISION AUDIO CONTROL - Smooth bass and treble knobs plus tone-defeat button let you tailor sound to your space.

The Kinter K2020A+ Class T amplifier harnesses the original Tripath TA2020-020 chip to deliver efficient, distortion-minimized 20W per channel output. Its compact design and included 12V 5A power supply make it ideal for DIY audio projects and small-room setups. Featuring gold-plated RCA inputs, improved speaker connectors, and adjustable bass/treble controls, this limited-edition amp offers professional-grade sound customization in a sleek, space-saving package.

Specifications

Asin	B077Z7DBRT
Best Sellers Rank	#204,947 in Electronics (See Top 100 in Electronics) #1,206 in Audio Component Amplifiers
Brand Name	Kinter
Customer Reviews	4.4 4.4 out of 5 stars (1,370) 4.4 out of 5 stars
Item Dimensions	4.72 x 5.79 x 1.65 inches
Item Weight	16 ounces
Manufacturer	Kinter
Minimum Supply Voltage	12 volts
Model	K2020A+
Mounting Type	Surface Mount
Number Of Channels	2
Output Power	20 watts
Part Number	K2022A+
Specification Met	CE
Upc	651814994414
Voltage	12 volts
Warranty Description	1 Year Warranty

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