General Description

The X2u compact universal XLR-to-USB adapter enables you to connect any microphone directly to your computer.

A XLR Connector
B Tri-color peak level indicator: Green = signal, Yellow = peak, Red = clipping
C MIC GAIN: Adjusts microphone input level before the analog to digital conversion
D Headphone jack: For zero-latency direct monitoring
E VOLUME: Adjusts headphone volume
F MONITOR: Blends pre-recorded playback from the computer with live audio from the microphone
G +48V: Phantom power switch for condenser microphones. Switch off for microphones that do not require phantom power (conserves battery life when connected to a laptop)
H Orange phantom power indicator
I USB: Illuminates green when properly connected to a powered computer USB port
J USB Connector: Digital audio interface

XLR Connection

Use an XLR cable to connect to microphone and secure the adapter to a microphone stand using the supplied straps.

USB Connection

Connect to a powered USB port using a standard cable (supplied).

The green USB light should illuminate and the plug-and-play driver will install automatically.

You are then ready to record with your favorite audio software.

Note: Make sure to use a powered USB port.

Monitoring While Recording

The headphone jack provides direct monitoring of the microphone signal while recording, without any of the delay that occurs if you were to monitor this signal through the computer’s headphone output.

Warning: Turn the VOLUME control down before plugging in headphones

You can also monitor previously recorded tracks while recording a new track. Adjust the MONITOR thumb slider to balance levels from pre-recorded and live audio.

Note: Be sure to turn off monitoring in your software for the track to which you are recording.

Gain Adjustment

For maximum audio quality, set the MIC GAIN as high as possible. The peak level indicator should remain a steady green while recording, flickering yellow at the highest sound volumes.

Lower the MIC GAIN if the peak level indicator shows red at any time during a performance.

USB Audio Device Driver

If you encounter problems, make sure the driver was properly installed.

Windows Operating Systems

From the Control Panel, open Sounds and Audio Devices.

In the Audio tab, look for Shure Digital in the drop-down menus for Sound playback and Sound recording.

Macintosh OSX Operating Systems

Open the Sound Preference window from System Preferences. Select Shure Digital from both the Input and Output tabs.

Note: GarageBand users: open GarageBand before plugging in the microphone to automatically select the USB device.


Problem Solution
No USB power indicator light Verify port is powered USB 1.1 or 2.0.
No sound in headphones Turn up the VOLUME or MIC GAIN thumb slider.
Sound is distorted Turn down MIC GAIN.
Source sounds delayed Turn off software monitoring in the computer software.
Headphones are not loud enough

Windows: From Control Panel, choose Sound and Audio Devices, select Audio tab, click Volume under Sound playback and turn up Volume Control.

Mac: From System Preferences, Choose Sound, Select Output tab and turn up Output volume.

Microphone input is too quiet in headphones Turn down MONITOR thumb slider


Frequency Response

20 to 20,000 Hz ±1 dB

Input Impedance

(@ 1 kHz)

1.6 kΩ

Maximum Input Level

0 dBV

Power Requirements

USB-powered, 500 mA, maximum

Phantom Power Supply

48 V, 10 mA

Digital Noise Floor (20 Hz to 20 kHz, A-Weighted)

Minimum MIC GAIN setting -81 dB FS
Maximum MIC GAIN setting -78 dB FS

Sampling Rate

up to 48 kHz

Bit Depth

16 bit

Peak Signal Indicator (Tri-color)

OFF -30 dB FS
Green -30 to -12 dB FS
Yellow -12 to 0 dB FS
Red >0 (digital converter clipped)

Adjustable Gain Range

50 dB

Headphone Output

3.5 mm (1/8 inch) 60 mW @ 32Ω

Note: specifications are subject to change.


3 m (9.8 ft) USB Cable

Padded Zipper Pouch


LISTENING TO AUDIO AT EXCESSIVE VOLUMES CAN CAUSE PERMANENT HEARING DAMAGE. USE AS LOW A VOLUME AS POSSIBLE. Over exposure to excessive sound levels can damage your ears resulting in permanent noise-induced hearing loss (NIHL). Please use the following guidelines established by the Occupational Safety Health Administration (OSHA) on maximum time exposure to sound pressure levels before hearing damage occurs.

90 dB SPL

at 8 hours

95 dB SPL

at 4 hours

100 dB SPL

at 2 hours

105 dB SPL

at 1 hour

110 dB SPL

at ½ hour

115 dB SPL

at 15 minutes

120 dB SPL

Avoid or damage may occur

Information to the user

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and the receiver.
  • Connect the equipment to an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.
  • EMC Directive 2004/108/EC

Note: Testing is based on the use of supplied and recommended cable types. The use of other than shielded (screened) cable types may degrade EMC performance.

Industry Canada ICES-003 Compliance Label: CAN ICES-3 (B)/NMB-3(B)


The CE Declaration of Conformity can be obtained from:

Authorized European representative:

Shure Europe GmbH

Headquarters Europe, Middle East & Africa

Department: EMEA Approval

Jakob-Dieffenbacher-Str. 12

75031 Eppingen, Germany

Phone: +49-7262-92 49 0

Fax: +49-7262-92 49 11 4