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

Shure MVX2U XLR-to-USB Digital Interface With Headphone Jack

Product ID: 549420523

Details

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

🎧Zero-Latency Headphone Jack

🔌XLR-to-USB Plug & Play

🎙️60dB Gain Control

£203.43

Duties & taxes included

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Description

🎤 Elevate your sound game—pro studio quality, zero hassle.

ZERO LATENCY MONITORING - Monitor your sound live with the built-in headphone jack for flawless, delay-free audio feedback.
COMPACT LIGHTWEIGHT DESIGN - Sleek, portable form factor fits effortlessly into any professional setup without clutter.
FUTURE PROOF FIRMWARE UPDATES - Stay ahead with ShurePlus MOTIV app updates that keep your interface evolving with new features.
PRO LEVEL GAIN PHANTOM POWER - Up to 60dB clean gain plus 48V phantom power to unlock the full potential of dynamic and condenser mics.
BROADCAST READY AUDIO INTERFACE - Plug your XLR mic directly into your PC or Mac with seamless USB-C connectivity—no mixer needed.

The Shure MVX2U is a single-channel XLR-to-USB digital audio interface designed for podcasters, musicians, and creators seeking professional-grade sound. Featuring up to 60dB gain, 48V phantom power, zero-latency headphone monitoring, and seamless Mac/Windows compatibility, it delivers plug-and-play convenience with future-proof firmware updates via the ShurePlus MOTIV app. Compact and lightweight, it’s the ultimate tool to upgrade any XLR microphone setup for streaming, recording, or live performance.

Specifications

ASIN	B0C8W8D4PD
Audio Input	XLR
Brand	Shure
Brand Name	Shure
Compatible Devices	Personal Computer
Compatible devices	Personal Computer
Connectivity Technology	USB
Connectivity technology	USB
Country of Origin	China
Customer Reviews	4.5 out of 5 stars 686 Reviews
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
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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