Acoustic Foam vs Fiberglass Panels (2026)

By Elena Vasquez · September 30, 2026

Understanding Acoustic Treatment Basics

When building a home studio or treating a listening room, choosing the right absorption material is critical. The two most common options are open-cell acoustic foam and rigid fiberglass panels. Each has distinct properties that affect sound quality, durability, and cost.

Absorption Performance

Acoustic foam excels at mid-to-high frequency absorption. Standard 2-inch wedge foam achieves an NRC of around 0.50. Fiberglass panels, particularly those using Owens Corning 703, achieve NRC values of 0.85 to 1.05 at equivalent thicknesses.

For bass trapping, fiberglass panels significantly outperform foam. A 4-inch fiberglass panel mounted with a 2-inch air gap absorbs frequencies down to 125 Hz effectively.

Frequency Response Comparison

125 Hz: Foam (2") ~10%, Fiberglass (4") ~60%
500 Hz: Foam (2") ~55%, Fiberglass (2") ~85%
2000 Hz: Both absorb >90%

Cost and Installation

Acoustic foam costs $2-4 per square foot with easy mounting. Fiberglass panels cost $3-6 per square foot but require fabric wrapping and wooden frames. However, fiberglass is more effective per panel — you typically need half as many.

Verdict

For professional studios, fiberglass offers superior broadband absorption. For budget projects, foam provides acceptable mid-high control. Many studios use a hybrid: fiberglass for primary reflection points, foam for secondary treatment.