Tip Number 29: Diffusion Isn’t Decoration

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You’ve treated the room. Sidewall panels dialed in. Absorption behind the seat. Bass feels taut, highs are clean, decay is under control. But the space around the notes? Maybe it’s gone quiet. Not silent—just lifeless. The stage might feel a little collapsed. The reverb tails you once loved now fade too fast. The music’s still accurate—but it might not be breathing.

Could be the room’s not just controlled. It may be over-damped.

What to Do
Pull back gently. If there’s absorption on nearly every surface—especially behind your ears or high on the ceiling—it’s worth rebalancing. Try replacing some panels with broadband diffusers. Stepped or skyline-style designs work beautifully at rear walls and first reflection points. If space or budget’s tight, try uneven bookshelves filled with varied depths and textures—they can scatter energy better than you'd think. Focus especially on midrange and treble zones above 500 Hz. That’s where spatial cues live. That’s where reverb breathes.

Don’t aim for “dead quiet.” Aim for “naturally alive.”

Here’s Why That Works
Absorption removes energy. Diffusion preserves it—while scattering it in time and space. When too much high-frequency energy is absorbed, the room starts to feel less like a space and more like a recording booth. Imaging can stay sharp, but depth and width collapse. You’re not just removing reflections. You’re removing life.

Playback doesn’t thrive in silence. It thrives in balance. Pull back just enough to let the music feel room-sized again.

Sometimes, the best fix isn’t more treatment. It’s a little subtraction—and the return of reflections that sound like space, not smear.

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Paul McGowan

Founder & CEO

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