Room Gain
The free low-bass boost small rooms add below their lowest mode.
Below the frequency whose half-wavelength exceeds the room’s longest dimension, a sealed room reinforces bass — several dB of free extension, strongest in small rooms. This is why sealed subs shine in bedrooms: their gentle roll-off plus room gain lands close to flat, where a ported sub’s steep roll-off leaves a hole or its output peak booms.
Category: Room Acoustics & Placement