Room correction has a reputation problem. Marketing suggests it solves acoustics; experience suggests it sometimes makes things worse. Both are partly right, and the dividing line is a frequency.
Below the transition frequency
In the modal region — roughly below 200–300 Hz in a domestic room — sound behaves like pressure rather than rays. Room modes create peaks and nulls that are consistent across a seat and genuinely correctable with EQ and delay. This is where correction earns its keep, and the improvement can be dramatic.
Above the transition frequency
Higher up, what reaches the listener is a direct sound plus a dense field of reflections arriving within milliseconds. A microphone sums all of it; your ears do not. Flattening that summed response with EQ often attacks the direct sound to compensate for reflections — and the result measures better while sounding worse.
Correct the modal region electronically. Correct the rest of the spectrum with treatment, placement and directivity.
A practical order of operations
- Position the speakers and the primary seat first. Geometry is free.
- Treat the first reflection points and trap the corners.
- Integrate subwoofers by hand — level, phase, crossover — before running any automated routine.
- Then let correction handle what is left below the transition frequency.
- Verify by measurement and by listening. If they disagree, trust neither until you know why.
Used in that order, correction is one of the highest-value tools available. Used as a first step, it is an expensive way to paper over a room.
