What is the advantage or disadvantage of using a power supply voltage higher than the 5v you get through the usb to dc cable?

The USB power plug included, when plugged into the PC directly just have an overwhelming hiss. The hiss left when I used a 1A 5V USB charger, but the best sound came when I found an old large "wall-wart" 12V 1A with the same plug. The jump from 5V to 12V added a lot of warmth and detail. Get the linear supply wall-worts, not the switching kind (generally smaller in form-factor). I also used ferrite snap-on cores on the audio from the pc, high quality shielded audio cables. I'm most pleased with this unit when it's properly powered.

Is this a decent headphone amp for a turntable that has a built in pre amp?

Signal source is irrelevant as long as it is a low impedance line level.

Can someone post a link to a good DC power adapter for this sold on Amazon?

When I purchased this item recently from Amazon, I had a similar concern about the power supply, because I live in a 220V 50Hz electric supply zone. In my case, I received the amplifier with a charging cable having a standard (I think) plug on one end and a USB A plug on the other end. This end can be plugged into any phone charger with a USB A port. I found the amplifier works very well if this is also plugged in the USB port on the computer.

How do I pick another power supply for this? I’d like to replace it but don’t know how to figure out if something will work with this.

I’m using a Radio Shack 12volt 1000ma power adapter. It comes with different tip sizes so I used one that fit and that had a positive center like shown printed on the back (near the receptacle) of the amp. The range required of the Douk is 5 volts to 20 volts so mine being 12 volts is good. In the reviews someone commented that they had issues with using 5 volt chargers. That’s why I went with a little more power. Check your manual in case they made changes to this unit since the time bought it( earlier this year)

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🎧 Elevate your audio game with pure Class A power — don’t just listen, experience!

COMPACT YET MIGHTY - Sleek desktop design weighing just 168g, perfect for your home stereo setup without clutter.
PURE CLASS A WARMTH - Experience ultra-low distortion and rich, delicate sound with a 1300mA Class A transistor output.
VERSATILE VOLTAGE RANGE - Operate seamlessly from 5V to 20V DC, ensuring stable high-voltage amplification at 26V.
POWERFUL HEADPHONE DRIVE - Effortlessly power high-impedance headphones like HD600, K702, and DT880 with strong drive capability.
PLUG PLAY OPAMP UPGRADE - Customize your sound with an easy plug-in opamp socket for endless tonal possibilities.

The Douk Audio U3 is a mini Class A HiFi headphone amplifier featuring a TI-NE5532 opamp and a 1300mA transistor output for ultra-low distortion and warm sound. It supports a wide DC input voltage range (5-20V) and includes a plug-in opamp socket for easy upgrades. Designed to drive high-impedance headphones effortlessly, it’s a compact desktop amplifier ideal for audiophiles seeking premium sound clarity and customization.

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Brand	Douk Audio
Manufacturer	Douk Audio
Item model number	XZ-U3
Batteries Included	No
Package Dimensions	13.21 x 9.19 x 8.31 cm; 167.83 g
Batteries Required	No
Item Weight	0.37 Pounds

Upgraded Douk Audio U3 Head Amplifier, Mini Class A HiFi Headphone Amplifier Desktop Home Stereo Amplifier DC5V

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