Guides

What it takes to produce a room measurement: which microphone, how to set REW up, where to put the mic, and how to get the text export that every analysis on this site starts from.

A practical guide to reading the graphs REW produces: which parts of the frequency response matter, what the Schroeder frequency changes, and how to tell a room problem from a speaker problem.

Room correction fixes resonances and cannot fix cancellations, decay times or reflection ripple. Here is how to tell which is which before you spend money on DSP.

A big peak somewhere between 40 and 80 Hz is the most common measurement result there is. Here is how to work out which room dimension caused it and what actually removes it.

Waterfall plots look impressive and are widely misread. What the axes mean, which settings change the picture, and what to conclude from the ridges.

A deep dip between 60 and 300 Hz is often the wall behind your speakers cancelling the woofer. How to calculate its frequency, confirm it with two measurements, and move it.

Why an in-room response should slope down rather than run flat, a house curve you can load into REW's EQ window, and where to follow the target and where to ignore it.

Setting up REW's EQ window for a Windows PC step by step: the target, the settings that stop it boosting nulls, exporting the filters, and loading them into Equalizer APO safely.