Granelli Audio Labs G5790
• Can I send my SM57 to you for modification?

We're sorry that we do not offer that service. We only modify brand new SM57s that we purchase from authorized dealers. We do offer a Do-It-Yourself conversion kit that comes with the machined part, wires and heat-shrink tubing, and instructions that you or a qualified tech in your area can use to modify your SM57 or SM58.

To learn more about the modification process and eligible microphones, click here.

If you would like a brand new SM57 that has been professionally modified, tested, and guaranteed with a two-year warranty, you can order a completed unit here.

• Are you affiliated with Shure?®

We're not affiliated, but we've become friends over the process of developing this mod. They seem glad that we've helped their ubiquitous mic become even more ubiquitous (is ubiquitouser a word?). We are an independent company, so the G5790 is not a Shure product and is no longer covered by the SM57's original warranty. We offer our own two-year warranty.

• Does your mod change the tone of the mic?

It took a few prototypes to get it right, but we finally achieved the results we were looking for. We sent mics to be independently tested by Arthur Sloatman of Midget Electronics in Nashville and by the lab at Shure. Arthur sent us specs that confirmed identical results on the same mic before and after modification, and Shure told us that the on axis frequency response was "a near perfect match."

We've also been asked if the body of the mic makes an impact either way since it's behind the capsule. You can see for yourself by unscrewing one of your stock SM57s and testing the tone with the back open or by stuffing the inside of the mic with some kind of absorptive material. You will notice a change because acoustical pathways coming from behind the capsule reach into the open space in the middle of the microphone. This space was engineered by the original mic's designers, and we had to engineer a new version of this internal cavity that would fit our modified shape yet produce the same results. Read more in our interview with

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