Stereo recording separates from mono by capturing spatial information—where sounds originate in relation to the listener. Getting stereo right is harder than recording mono, because incorrect technique doesn't just mean quieter or noisier recordings—it means recordings that sound wrong in ways that are difficult or impossible to fix in post-production. Understanding the three main stereo recording techniques and when each applies will dramatically improve your portable recordings.
Every stereo technique involves tradeoffs between mono compatibility, stereo width, phase coherence, and practical recording considerations. There is no universally "best" technique—the right choice depends on what you're recording, what equipment you have, and how the recording will be used. Learning multiple techniques and developing judgment about when to apply each is part of becoming a skilled recordist.
XY (Coincident) Technique
XY technique uses two directional microphones positioned as close together as possible with their capsules at 90 to 135-degree angles. Because the capsules occupy the same physical space, time differences between the channels are eliminated, leaving only level differences to create stereo imaging. The result is a mono-compatible recording with focused center imaging and natural stereo spread. This is why XY is the technique most portable recorders use—the built-in stereo microphones are typically configured in XY configuration.
The limitation is that XY produces a narrower stereo field than other techniques. For solo instruments, speech, or situations where you want a relatively focused image, this is ideal. For capturing wide ambient spaces or ensemble performances where you want to convey the sense of width, XY can feel claustrophobic. The angle between the microphone elements determines the effective stereo width—wider angles create more spread but can cause imaging artifacts.
When to Use Each Technique
My practical decision framework: Use XY for anything where mono compatibility matters, for focused sources like single instruments or speech, and for any recording on a portable recorder without external microphones. Use AB when recording wide spaces where you need to capture the full acoustic environment, accepting the mono compatibility risks. Use MS when you won't know until post-production how the recording will be used, or when you need flexibility to adjust stereo width after recording.
Use our Microphone Distance Calculator to optimize placement for your chosen stereo configuration.