Dual miking guitar cabinets is a tried-and-true method of getting a great guitar sound. Using two mics, such as a ribbon (the Royer R121 is an example of one that works well for this) and a dynamic (the Shure SM57 is a classic for this application) combo that gets excellent results. However, using multiple mics also ends up creating potential phase issues, where each mic sounds fine by itself, but when you blend them, they sound filtered and weak.

Luckily, you can correct for this phase cancellation effect relatively easily. The root of phase issues is that the sound wave reaches each mic at a slightly different time. Following from that, one method to reduce or eliminate phase issues is to place the capsules of the mics as close as possible to each other, so that the mics hear the audio at the same time.

Another option is to put a each mic on a different speaker, then pan them differently for a wider signal. In this case, especially if you’re miking different cabinets, you’ll want the mics to each be the same distance from the speaker, and from each other, to minimize any phase issues.

You can also adjust for phase issues after the fact, by sliding tracks slightly in time in your DAW to align them properly in phase.

Finally, you can get a tool such as the Little Labs Analog Phase Alignment Tool to check your phase and adjust for any phase offset.

Dual miking can be an excellent way to get the most out of your guitar amps, just be careful to watch out for any phase issues!

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How to Dual Mic a Guitar Cabinet and get the Phase Right

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