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F.A.Q. Frequently asked questions.

Sine Bursts (20Hz-200Hz)

Background

Sine bursts are repeated sinusoidal patterns, characterized by a sharp attack and decay. In a correctly damped room, these bursts will remain detailed and well separated independently from their frequency.

Applications

Similarly to the swept sine test, this file can be used to determine resonant frequencies in your room. Resonance modes not only produce an uneven frequency response but also affect decay times. When a sound hits a resonance, the room will still resonate at that frequency after the initial sound disappeared. Decay times at those frequencies are thus longer than normal.

The sound files

wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓
20Hz	21Hz	22Hz	23.5Hz	25Hz	26.5Hz	28Hz	30Hz
wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓
47Hz	44Hz	42Hz	40Hz	37Hz	35Hz	33Hz	31.5Hz
wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓
50Hz	53Hz	56Hz	60Hz	63Hz	67Hz	71Hz	75Hz
wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓
120Hz	112Hz	106Hz	100Hz	95Hz	90Hz	85Hz	80Hz
wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓	wav ↓
126Hz	134Hz	142Hz	150Hz	160Hz	170Hz	185Hz	200Hz

Play back these files one by one. When you hit a room mode, the loudness will change and decay times will increase, resulting in a loss of clarity and definition.

Files below 40Hz will require fairly large subwoofers in order to play correctly!

External Links

• Room acoustics @ U. of Salford
• Room modes crash course
• Room Mode Calculator