Room Frequency Analyzer
Play pink noise or a log sweep through your speakers, capture it with your microphone, and see your room’s relative frequency response — resonant peaks, nulls, and low-frequency room modes — with treatment hints.
ℹ This is an uncalibrated guide. What you measure is your speakers + room + microphone combined, at one listening position — not the room alone. Laptop and phone mics colour the sound and roll off the deep bass, so trust the shape (big peaks, deep nulls, mode pile-ups) rather than exact dB, and ignore very-low-bass readings on a built-in mic. Measure from your seat, with your speakers playing into the room (don’t use headphones). For accurate work use a calibrated measurement mic and software like REW. The test signal plays through your speakers; the mic is analyzed live and never recorded or uploaded.
Green = your room’s relative response (normalised to its own average = 0 dB). Orange lines = predicted axial room modes. Red dots = peaks, blue dots = nulls.
How It Works
The tool sends a known test signal to your speakers and measures what comes back through the microphone. In pink-noise mode it plays continuous pink noise (equal energy per octave) and builds a long-term average of the captured spectrum, then removes pink’s natural −3 dB/octave tilt so a perfectly flat speaker+room+mic would read as a flat line. In sweep mode it plays a single 20 Hz→20 kHz logarithmic sine sweep and peak-holds the response at each frequency as the tone passes. Either way the curve is smoothed to about one-sixth of an octave and normalised to its own average, so it shows relative deviations, not absolute level. Sharp bumps are resonances and dips are cancellations; below roughly 300 Hz these are usually room modes — standing waves set by the room’s dimensions. Enter your room size and the tool overlays the predicted axial modes (f = n·c/2L) so you can see which peaks line up with them.
Because there is no calibration, the vertical scale is relative and the absolute accuracy depends entirely on your microphone and speakers. A built-in laptop or phone mic has its own response and very little true deep-bass sensitivity, so treat sub-100 Hz readings with caution and compare changes on the same setup. Used sensibly, it’s great for finding the big problems: a boomy modal peak, a deep null at the listening seat, or an obviously bright/dull balance — the things that physical treatment and speaker/seat positioning actually fix.