1. Core Material (Foam) – Why It Matters

The acoustic foam inside a soft bag determines how much sound it absorbs, especially mid and high frequencies (500–4000 Hz).

Tip: Press the foam — it should spring back quickly. If it stays compressed, it is low quality.

2. Upholstery Material – Looks & Durability

The outer fabric or leather affects both aesthetics and performance. Thin or cheap fabric may sag and tear, reducing absorption.

Tip: Good upholstery is tight, smooth, and wrinkle-free when mounted.

3. Backing Cloth & Fixing Method – Hidden Strength

The back layer keeps the foam and fabric in place. Nails, adhesives, or a reinforced cloth prevent sagging over time.

Professional soft bags use reinforced adhesive cloth + nails.

Cheap versions may rely on weak glue, which can fail in months.

4. Base Plate Material – Structural Support

The base plate holds the panel together. Quality materials are:

MDF (Medium-Density Fiberboard)

5-layer plywood

Density fiberboard (E0 grade, formaldehyde-free)

Tip: Test by pressing the panel — it should not flex or crack.

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5. Installation & Placement Tips

Even the best soft bag fails if poorly installed:

First Reflection Points: Walls near speakers, TVs, or projectors.

Corners: Use “bass traps” for low-frequency control.

Ceiling Panels: For large rooms or studios with echo.

Conclusion

A high-quality soft bag combines:

Dense, resilient foam

Durable, wrinkle-free upholstery

Strong backing and fixings

Stable base plate

Check material, feel, and structure, and install at strategic points. This ensures both optimal sound absorption and aesthetic appeal