What is the baffle step?
A loudspeaker's front panel (baffle) reflects sound forward at high frequencies, so treble radiates into a half space. At low frequencies the wavelengths are much larger than the baffle and sound wraps around the cabinet, radiating into a full sphere. The result is a gradual 6 dB drop in bass relative to treble – the baffle step. Without compensation, a speaker that measures flat on a large baffle sounds thin in a room.
Baffle step frequency (Hz) ≈ 115 ÷ baffle width (m)
Typical baffle step frequencies
| Baffle width | Approx. f3 | Typical speaker |
|---|
| 15 cm (6 in) | ≈ 770 Hz | Small bookshelf |
| 20 cm (8 in) | ≈ 575 Hz | Bookshelf / monitor |
| 25 cm (10 in) | ≈ 460 Hz | Large bookshelf / slim tower |
| 35 cm (14 in) | ≈ 330 Hz | Wide floorstander |
How compensation works
A common passive solution is an inductor in series with the woofer with a resistor in parallel with it. Above the baffle-step frequency the inductor's impedance rises and the resistor limits the cut; below it the inductor passes bass freely. The net effect: the midrange and treble are reduced relative to the bass, flattening the response at the cost of overall sensitivity.
- Full compensation (6 dB) suits speakers on stands well away from walls.
- Partial compensation (3 – 4 dB) suits speakers near a wall, because the boundary itself adds bass.
- Many designers merge the BSC inductor with the woofer's low-pass crossover inductor.
Design tips
- Offset drivers from the baffle's centre and round or chamfer the edges to smooth diffraction ripples.
- Remember the tweeter level: after 6 dB of BSC, the tweeter usually needs an L-pad.
- Use air-core inductors with low DC resistance – resistance in series with the woofer reduces bass output and damping.
- Measure in-room or with gated measurements and adjust compensation by ear.
Active alternatives
With DSP or active crossovers, baffle step can be corrected with a shelving EQ instead of passive parts, without losing sensitivity – the amplifier simply provides a little more bass power.
Frequently asked questions
What is baffle step loss?
A gradual 6 dB drop in bass relative to treble because low frequencies wrap around the speaker cabinet.
How do I calculate baffle step frequency?
Divide 115 by the baffle width in meters. A 20 cm baffle has its step around 575 Hz.
Do I need full baffle step compensation?
Full 6 dB suits free-standing speakers; 3 – 4 dB usually works better near walls.
What does a BSC circuit cost in sensitivity?
Roughly the amount of compensation – 6 dB for full BSC.
Can I do baffle step compensation with DSP?
Yes, a low-shelf EQ boost achieves the same result without passive losses.
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Last updated: October 28, 2026
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