Can this adapter let me plug a USB mic into an XLR mixing board?

I'm sure you can, but you'd probably need another a usb adapter, if your mic is a female usb, then you'll need a male to male adapter chord, assuming that the XLR on this adapter is male.

Does the +48V button act as a power switch? Does it have to be "on" to pass signal through? (I already have phantom power supply in the audio chain)

No, it doesn't act as a power switch. It is only for running a condenser mic. It can be left off. However, if you are feeding 48v as input to this unit, when it is designed to have only the signal as input, I do not know what the effects will be. I imagine that it is best to operate the 48v boost at the last device before the mic, if even your mic needs the boost at all.

What does the "monitor" dial do?

It controls the mix level of the headphone out without affecting the gain or mic volume .

Most of the answers say this is for low impedence mics. i'm looking for a way to connect the wireless audio2000s mic system to my computer. will i have any problems if i'm using a macbook pro and the mic receiver has an output of what appears to be 600 ohms?

Couldn't say for sure, but impedance seems to be much less of a concern with the mic circuitry in use lately. If there's a preamp in your mic's receiver, you wouldn't need this unit. It's not merely an adapter. It's a preamp. If you do need a preamp, just get the right patch cord to match the output jack of your wireless receiver to the X2U's female XLR jack & you should be good to go.

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Shure MVX2U XLR-to-USB Digital Interface with Headphone Jack, Integrated Pre-amp with 60dB Gain Control, Zero-Latency Monitoring, 48V Phantom Power, ShurePlus Desktop App, 1m USB-C Cable

Shure MVX2U XLR-to-USB Digital Interface with Headphone Jack, Integrated Pre-amp with 60dB Gain Control, Zero-Latency Monitoring, 48V Phantom Power, ShurePlus Desktop App, 1m USB-C Cable

Product ID: 549420523

Details

Brand
Shure
Compatible devices
Personal
Connectivity technology
USB
Number of channels
1
Supported software
ShurePlus App

⚡60dB gain & 48V phantom power

🎧Zero-latency headphone monitoring

🔌XLR-to-USB plug & play

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Description

🎙️ Elevate your sound game—pro audio, zero hassle.

PRO GRADE GAIN CONTROL - Up to 60dB gain and 48V phantom power to unlock the full potential of dynamic and condenser mics.
ZERO LATENCY MONITORING - Hear yourself in real-time with the built-in 3.5mm headphone jack—no delay, no distractions.
FUTURE PROOF AUDIO SETUP - Stay ahead with ShurePlus Desktop App updates that keep your interface evolving with your needs.
CROSS PLATFORM COMPATIBILITY - Works flawlessly with both Mac and Windows via included USB-C cable for ultimate flexibility.
PLUG PLAY LIVESTREAM READY - Seamlessly connect any XLR mic to USB with instant Auto Level Mode—no setup fuss.

The Shure MVX2U is a compact, professional XLR-to-USB digital interface featuring a powerful 60dB gain preamp, 48V phantom power for condenser mics, and zero-latency headphone monitoring. Compatible with Mac and Windows, it includes the ShurePlus Desktop App for ongoing updates, making it an essential tool for livestreamers and podcasters seeking reliable, studio-quality audio on the go.

Specifications

ASIN	B0C8W8D4PD
Audio Input	XLR
Brand Name	Shure
Compatible Devices	Personal Computer
Connectivity Technology	USB
Country of Origin	China
Customer Reviews	4.5 4.5 out of 5 stars (674)
Impedance	5.8 Ohms
Included Components	Item
Item Dimensions D x W x H	28D x 28W x 85H millimeters
Item Type Name	XLR-to-USB adapter
Item Weight	100 Grams
Manufacturer	Shure
Manufacturer Part Number	MVX2U
Maximum Sample Rate	48 KHz
Model Number	MVX2U
Number of Channels	1
Operating System	Windows, macOS
Supported Software	ShurePlus MOTIV Desktop App
UPC	042406767767
Unit Count	1.0 Count
Warranty Description	2 years

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