Shure M268 4-Channel Microphone Mixer

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Description

The Shure M268 is a compact, transformer-balanced 4-channel microphone mixer designed for broadcast, live sound, recording, and AV applications. It combines robust performance with low noise and a flat frequency response in a half-rack chassis—perfect as a primary or supplementary audio mixer Read more

Features

4 transformer-balanced XLR mic inputs with built-in low-cut filters to reduce rumble below 80Hz
Switchable mic/line-level XLR output and five –10dB RCA auxiliary inputs, plus one RCA aux output
12V phantom power across all mic inputs for condenser microphone use
Six transformers total (four on inputs, one on output, one toroidal power transformer) for low noise, RF immunity, and protection from ground loops
Built-in low-cut filter on microphone channels to improve clarity and reduce unwanted low-frequency noise
LED peak output meter for visual level monitoring

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Features

4 transformer-balanced XLR mic inputs with built-in low-cut filters to reduce rumble below 80Hz
Switchable mic/line-level XLR output and five –10dB RCA auxiliary inputs, plus one RCA aux output
12V phantom power across all mic inputs for condenser microphone use
Six transformers total (four on inputs, one on output, one toroidal power transformer) for low noise, RF immunity, and protection from ground loops
Built-in low-cut filter on microphone channels to improve clarity and reduce unwanted low-frequency noise
LED peak output meter for visual level monitoring

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About the Shure M268 4-Channel Microphone Mixer

The Shure M268 is a classic four-channel microphone mixer and line amplifier revered for its distinctive transformer-based design and warm, musical sonic character. Designed as a utilitarian yet sonically significant tool, each channel features a high-quality microphone input transformer coupled with discrete solid-state electronics, imparting a gentle harmonic saturation and frequency shaping that many engineers seek for vocal and instrumental sources. Its primary function is to provide clean gain, basic mixing, and a subtle tonal enhancement, making it historically popular both as a front-end preamplifier in studio recording environments and as a simple, reliable submixer for live sound applications.

Operation of the unit is intentionally straightforward, focusing on essential controls for practical workflow. Each channel offers a rotary gain control, a three-position low-frequency filter for rumble reduction, and a rotary pan pot. The mixer sums the four channels to a single mono output, with an additional dedicated transformer-isolated direct output available from channel one, allowing for flexible signal routing. This simplicity belies its sonic impact; the combination of the input transformer and the Class A output stage produces a rich, full-bodied sound with a smooth top-end roll-off and a pronounced, musical low-mid presence that can help sources sit firmly in a mix.

Despite its minimalist feature set, the M268's enduring legacy is built on its reliability and the unique tonal color it provides. The robust, all-metal construction ensures durability, while the passive filtering and transformer balancing contribute to excellent noise rejection and ground isolation. It serves as an excellent example of functional, high-quality analog audio design, offering a specific sonic texture that is often emulated digitally but rarely replicated exactly. For engineers seeking to add a layer of classic analog warmth and depth to microphones, direct instruments, or even line-level signals, the M268 remains a valued piece of audio heritage.

Key Features

4 transformer-balanced XLR mic inputs with built-in low-cut filters to reduce rumble below 80Hz
Switchable mic/line-level XLR output and five –10dB RCA auxiliary inputs, plus one RCA aux output
12V phantom power across all mic inputs for condenser microphone use
Six transformers total (four on inputs, one on output, one toroidal power transformer) for low noise, RF immunity, and protection from ground loops
Built-in low-cut filter on microphone channels to improve clarity and reduce unwanted low-frequency noise
LED peak output meter for visual level monitoring

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