Acoustic Absorption

Summary

Abstract

Acoustic absorption is consistently cited as one of the highest-impact investments for any studio, often more important than upgrading gear. The community emphasizes treating first reflections, corners (bass traps), and ceilings. DIY panels using Rockwool or Owens Corning 703 are the most cost-effective approach, while GIK Acoustics is the go-to for pre-made solutions. Auralex foam is generally discouraged — too expensive for what it does, and most professional studios use custom panels instead.

Key Characteristics

• First reflections (side walls at the mix position) are the highest priority
• Bass traps in corners address low-frequency buildup
• Ceiling treatment (clouds) is frequently forgotten but critical
• Dense, thick absorptive material (4”+) needed for broadband absorption
• Foam is ineffective at low frequencies — mineral wool or fiberglass is preferred
• Air gap behind panels adds effective absorption depth for free
• Breathable fabric coverings are essential — reflective materials negate the absorption
• Blankets on mic stands can serve as improvised treatment for tracking

Use Cases

• Mixing room treatment for accurate monitoring
• Tracking room control for clean recordings
• Portable treatment for traveling studios
• Deadening live rooms for dry vocal recording

Settings & Sweet Spots

• Treat first reflections first, then corners, then ceiling
• Use the mirror trick to find first reflection points
• 4” panels minimum; 6” or deeper in corners
• Air gap behind panels = free extra depth
• Do not over-treat — a completely dead room is unpleasant and can hurt the music

Comparable Alternatives

Approach	Price Range	Notes
DIY Rockwool Panels	~$30-50/panel	Best value, requires labor
GIK Acoustics	~$60-200/panel	Pre-made, long lead time
Auralex Foam	~$100-300	Expensive, thin, poor LF absorption
Professional Acoustic Design	$$$$	Best results, highest cost
Heavy Blankets	~$20-50	Improvised, portable, surprisingly effective

Common Mistakes

• Buying Auralex foam instead of dense mineral wool panels
• Treating only the walls and forgetting the ceiling
• Using reflective fabric that negates the panel’s absorption
• Over-treating a room until it is uncomfortably dead
• Spending thousands on gear upgrades before addressing room acoustics
• Not considering the position of the singer relative to the mic’s rejection pattern

See Also

• Rockwool
• GIK Acoustics

Source Discussions

Zack Hames

“Auralex foam can work, but it’s expensive and you’d want the thickest you can get. TBH I can’t think of the last studio I saw that actually uses this as opposed to making panels themselves. It’s just better cost-wise and more effective.”

Zack Hames

“The biggest thing people usually forget is the ceiling.”

Zack Hames

“Just make sure you actually use absorptive material, then cover it with a breathable fabric that DOESN’T reflect, making the absorption moot.”

Slow Hand

“Teaching yourself about acoustics is overwhelming and there are so many conflicting opinions out there to wade through.”