A Shure SM7B microphone on a boom arm in a bright home studio, with a woman in headphones speaking into it at her desk. Image: Shure
Voice Over Articles

Your Room Is Louder Than Your Microphone: How to Read a Mic Spec Sheet for Voice Work

Marcus Delgado · October 27, 2026 · 8 min read

Every microphone box is covered in numbers, and most of them were written for engineers recording drum kits. A voice actor in a spare room needs to read about four of them. Here's what self-noise, sensitivity, gain and pickup pattern actually mean for a voice read, using the makers' own spec sheets for four mics you'll see in home booths everywhere, and why the quietest number on the box often matters less than the room it goes into.

This is a reference piece, not a shopping list. Every figure is quoted from the maker, read on October 27, 2026. Prices are left out on purpose: they change by country and by week.

Every condenser microphone has electronics inside, and electronics hiss. The spec that measures it is called self-noise or equivalent noise level, and Neumann, the German studio mic maker, calls it the one to read first. "Self-noise is perhaps the most useful specification," its home studio guide says. "Nobody wants a noisy recording, and there's only so much noise we will tolerate before we feel it distracts from the music."

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