Crimson Audio Blue SM57/SM58 Modification

Crimson Audio

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Product Code: 1737
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The Crimson Audio Blue SM57/SM58 Modification is a evolution of the popular White transformerless modification, that has a character tailored for vocals. Like the the also feature a modified Crimson Audio Mogaine circuit to give back the the normal loss of output that occurs when you remove the transformer!

The Crimson Audio Blue SM57/SM58 builds upon the transformerless Shure SM57 modification, expanding on what the White.SM Mod started. The (like the eliminated the hassle and mess of removing the transformer from an SM57 or SM58, and the built-in Mogaine Circuit (which requires phantom power) gives you back the 10'ish dB of output gain you lose when removing the transformer - so you can still gain stage like you normally would. The steps in and takes the transformerless mod a bit further, with a tweaked circuit that tailors the character to improve performance in vocal applications. This cool design provides more cut when used with an SM58 cartridge, and more silky smoothness when used with an SM57 cartridge.

Like the, the Blue.SM solves the problem of loss in output you get from the transformerless mod. Again achieved by providing a scaled down version of their awesome Mogaine pre-preamp device, built into the handle. So you get all the good from the mod (now tweaked for vocals), and none of the bad!

This unique mod is not only affordable, but easy to do yourself. It only takes a couple mins, and some very basic soldering skills.

This mod also works with the Granelli Audio Labs G5790, and the Shure 545SD Front End Audio has gone the extra mile to make this an al la carte that is super simple.

1) Pick your Crimson Audio mod
2) Pick your Shure cartridge (if you are not installing on a preexisting mic)
3) Add a Granelli Labs 90 degree conversion kit (or not)
4) Install the mod (or build it, if getting a new cartridege)
Alternative 4) Let us install the mod for you (if you don't want to install it yourself).
5) Enjoy!

When you want us to build the mic (or install it on a cartridge you provide, for a small service fee, we will QC the parts, assemble the mic, QC the finished mic, and get it on the way to you - so you can just rock and roll right out of the box.

Don't forget about the killer White.SM, Yellow.SM, and Orange.SM mods, brought to you from Crimson Audio and Front End Audio!

Call 888-228-4530 or email us at if you have any questions.

Crimson Audio Blue SM57/SM58 Modification Features

  • Made it the USA
  • Transformerless active-circuit modification tailored for vocal applications
  • Requires +48 Volt Phantom Power (99.9999% of mixers and mic preamps have it).
  • Built-in (scaled down) Mogaine Circuit eliminates the loss of gain
  • Requires basic soldering skills to install
  • Coded XLR connector for easy identification
  • Laser etched Crimson logo on handle

Crimson Audio Blue SM57/SM58 Modification Includes

  • Crimson Audio Blue Handle
  • Installation guide
  • 1 Year Warranty

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