Rane SM82 Eight Channel Stereo Line Mixer

grey face model
black face model

Last Update 05-26-2025


This is probably the briefest webpage I have written, not much to write about line mixers. Line mixers are designed for devices with line level outputs - every keyboard and module I own has line level outputs. I don't need mic preamps with 60dB of gain or EQ with them. I started my MIDI studio with a Rane SM82 which fit the bill perfectly. Line mixers are simple circuits that can be built with just opamps, no discrete circuits. There is almost nothing circuit wise that can degrade the tone of anything. What goes in is what goes out.

Rane built high quality professional audio accessories until a new owner purchased them, who proceeded to discontinue all the professional audio products and replace them with DJ products. These mixers were a popular product which are easy to find used. The closest new product today is the Ashly LX-308B.

The SM82 is a 1U rackmount compact stereo line mixer with eight stereo or mono input channels, with stereo or mono effects buss and send levels for each channel. Each channel has a balance control (pan for mono signals), level control, and overload LED. The inputs and effects send/return are unbalanced, the main outputs are balanced. Effects and main output have balance and level controls. Also included are expand in/out jacks, which allow expansion by adding more SM82 mixers without consuming a channel (you must use expansion cables 18 inches or shorter to prevent noise). You simply chain multiple SM82 mixers with an expansion cable. That's it, simple and sweet.  Compact, easy to expand, and I don't need a large console to mix my keyboards/modules. A common malfunction is the main output level control; when they start to fail, the audio output will be intermittent. I have been unable to source a direct replacement pot, and Rane no longer stocks spare parts for legacy products.  So today I leave the main level controls alone and control the main output to my monitors using a stepped attenuator that I built from a circuit in the excellent book "Audio Cyclopedia" (Howard Tremaine, 1978 second edition seventh printing ISBN 0-672-20675-7). If I do need to record any of them to my multitrack, I use a Countryman Type 10 DI box.

As my arsenal grew, I added SM82 mixers. I now have five of them, three in the studio and two in my stage MIDI system. They were made in grey face and black face panels, there is no circuit difference in them. If you buy an SM82, you must make sure the sale includes the remote power supply ("lump in the middle") as the SM82 does not have an internal power supply.  There is no direct replacement for the Rane remote power supplies.  Rane did make an SM82S model that has an internal switching power supply.

Well, that's it.  Told you there wasn't much to write about!

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