Samson SM4U 4-Channel Rackmount Stereo Line Mixer

Mix multiple sources including XLR, RCA, 1/4", 1/8", and Bluetooth for streaming, video conferencing, or live use with the Samson SM4U rackmount line mixer.

The SM4U features an array of connections for both wired and wireless audio sources. Plug-in a wired microphone to the XLR-1/4" combo jack, or go hands-free by connecting a Samson XPD Digital Wireless system to the front panel USB jack. The Music channel includes stereo RCA inputs on the rear panel, as well as front-mounted stereo 1/4" and 1/8" inputs. Lastly, stream audio wirelessly via Bluetooth.

- Voice Priority:
The mixer includes a high-quality, bidirectional USB-C jack for interfacing with computers as well as tablets and smartphones that have USB-C ports. This allows you to record a mix, fly-in audio tracks for a presentation, or use the SM4U as a video conferencing mixer.
The Voiceover control offers priority ducking of up to 30dB while talking through a mic or using the XPD Wireless input. The Voiceover Hold knob lets you adjusts the active ducking hold time from 0.5 to 3 seconds. Whether you're leading a group class or making announcements, intelligibility is key.

- Installed Sound:
The compact SM4U takes up just half of a 1U rackspace and can be installed using the included rackmount kit. It can be mounted adjacent to most Samson Concert 88/288 and Concert 99 series wireless half-rack receivers. The mixer includes stereo XLR and RCA outputs that can be configured for either mono or stereo operation. A rear-mounted Master Volume allows the overall output level of the mixer to be preset for the room or application without the worry of accidental changes.


read more - 4-channel 1U half-rack stereo line mixer
- USB interface for connecting with computers or tablets with USB ports
- XLR-1/4" balanced microphone input
- Stereo line channel with RCA, 1/4" and 1/8" (3.5mm) inputs
- Bluetooth connectivity to wirelessly stream from a mobile device
- Samson XPD Series USB Port (wireless system sold separately)
- Voiceover control with priority ducking and variable hold time
- Rear panel master volume control
- 15V phantom power
- Selectable Mono or Stereo output setting
- Rackmount kit and power adapter included
WARNING: Cancer and Reproductive Harm -
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- Frequency Response: 20Hz20kHz 2dB (Mic to Main)
- T.H.D.: <0.02% (Mic/Line & Line to Main)
- Maximum Input Level: -23dBu @ 1kHz (Mic Input)
- Maximum Input Level: 2dBu @ 1kHz (Line Input)
- Maximum Output Level: +14dBu
- Bit Depth: 16-bit
- Sample Rates: 44.1kHz, 48kHz
- Signal-to-noise: >96dB
- Bluetooth: V4.0, A2DP V1.2
- Phantom Power: 15V DC
- Product Dimensions: 8.75" x 5.5" x 1.75" / 223mm x 138mm x 43mm
- Product Weight: 1.76lb / 0.8kg
Dimensions and Weight in Packaging
Base Item
Shipping Weight: 3.52 lbs
Shipping Dimensions: 12 x 10 x 2 in
Manufacturer Part Number (MPN): SASM4U

For support or warranty questions, please contact the manufacturer:
Phone: 516-870-7200


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