Room Correction

Room acoustics are typically the biggest source of sound coloration — bigger than speaker quality differences. Standing waves, reflections, and absorption patterns create peaks and dips in the frequency response that vary by listening position. SotF can measure these problems and calculate correction filters.

What you need

SotF (Terminal or Desktop)
A measurement microphone (e.g., miniDSP UMIK-1, Dayton Audio UMM-6)
A microphone calibration file (usually provided with the mic)
Your speakers connected and positioned at the listening position

Overview

The room correction workflow has 5 stages:

Device setup — Select output speaker and input microphone
Signal configuration — Configure the measurement sweep
Measurement — Play a sweep signal and record the room response
Analysis — SotF analyzes the recording and calculates corrections
Apply — Load the correction EQ into your plugin chain

Walkthrough

Open the Room EQ screen
- Desktop: Click the Room EQ tab
- Terminal: Navigate to Configure > Room EQ
Select devices
- Output device: Your speaker/DAC (the device playing the sweep)
- Output channel: Which speaker to measure (start with the left speaker)
- Input device: Your measurement microphone
- Input channel: The mic input channel (usually 0)

Configure the measurement

Parameter	Recommended	Description
Signal type	Sweep	Logarithmic frequency sweep (best SNR)
Duration	5 seconds	Longer = better SNR in low frequencies
Start frequency	20 Hz	Lower bound of sweep
End frequency	20000 Hz	Upper bound of sweep
Amplitude	-12 dBFS	Safe level — adjust if room is noisy
Sample rate	48000 Hz	Match your audio interface
Mic calibration	(load file)	Your UMIK-1 or equivalent calibration .txt

Run the measurement

Click Record / press Enter. SotF will:
- Play the sweep through the selected output channel
- Simultaneously record through the microphone
- Display progress in real-time
During the measurement:
- Stay still and quiet
- Keep the room as quiet as possible
- Don’t touch the microphone
Review the analysis

After recording, SotF analyzes the captured signal and shows:
- Frequency response of the room + speaker
- Phase response
- Impulse response
- Identified room modes (resonant frequencies)
Optimize and apply

SotF calculates parametric EQ filters to correct the measured response:
- Cuts at room mode frequencies (peaks)
- Gentle boosts at absorption dips (limited to avoid amplifying noise)
- The optimizer respects the passband of the measurement data
Click Apply to load the correction into your plugin chain.

Multi-point measurement

For better correction across a wider listening area:

Measure at your primary listening position (center of the sweet spot)
Measure at 2-4 positions around it (30-50 cm offset in each direction)
SotF averages the measurements to find corrections that work across the area