How it works
Hard, flat walls reflect sound straight back into your room — that's what causes echo, slap-back, and the "boxy" feeling on recordings or calls. The KK1429 3D felt diffuser breaks up those reflections by scattering sound waves across a textured 3D surface instead of bouncing them straight back at you.
The result: a tighter, clearer room without deadening it. You still hear yourself. You just stop hearing the room.
Technical data — what the numbers mean Spec Value Material High-density PET polyester felt (recycled) Panel 11.8 × 11.8 × 2.7 in (30 × 30 × 7 cm) Panel 1.54 lb / 24.7 oz (0.7 kg / 700 g) NRC range (felt material reference) ~0.20 – 0.45 (mid-range absorption) Diffusion behavior Broad-band scattering, 500 Hz – 5 kHz Fire rating (PET felt class) B1 / Class A typical for PET felt Off-gassing None — 100% PET, no glue binder A note on STC: STC measures sound transmission between rooms (e.g., wall-to-wall isolation). Diffusers like KK1429 are in-room treatment — they shape sound inside the room, not block it leaving. If you're trying to soundproof against neighbors, see our Door Kit PRO (KK1244). If you're trying to fix how your room sounds, you're on the right page. What's in the box Our 100-day promise If you don't hear a clear difference, send them back within 100 days for a full refund. No restocking fee for quality issues. 300,000+ customers worldwide. 5★ average across our 3D diffuser line. FAQ Will this soundproof my room from my neighbors? No. This is in-room acoustic treatment (echo control), not isolation. For isolation between rooms, see KK1244 Door Kit PRO. How many panels do I need for a 12 × 12 ft (3.6 × 3.6 m) room? 12 panels is a strong starting point. Add 6 more if the room is empty (no rugs, no sofa, no curtains). Will the adhesive damage my paint? With our KK1207 removable tape — no. With permanent mounting — possibly. Test on a hidden corner first. Black + white together, or one color? Both work. A checkerboard layout reads "designed." Single-color reads "minimal." Your call. Are the panels fire-rated? PET felt is typically Class B1 / Class A. Check your local building code for commercial install requirements. Does it smell? No. 100% PET, no glue binder, no off-gassing. Can I cut them to fit? Yes — a sharp utility knife works, or use our KK1155 panel cutter for a cleaner edge. Foam vs felt — what's the difference? Foam absorbs more (deadens). Felt scatters (clarifies). Most rooms want some of both — pair KK1429 with a foam panel kit.
This product is sold brand new. A manufacturer warranty applies only when the manufacturer provides one for this item.
Return requests must be submitted within 14 days of delivery and approved by our RMA department before the item is shipped back. Non-defective returns may be subject to a minimum 25% restocking fee and return shipping charges. Unauthorized returns are not eligible for credit or refund. Read the full return policy.
This product is sold brand new. A manufacturer warranty applies only when the manufacturer provides one for this item.
Return requests must be submitted within 14 days of delivery and approved by our RMA department before the item is shipped back. Non-defective returns may be subject to a minimum 25% restocking fee and return shipping charges. Unauthorized returns are not eligible for credit or refund. Read the full return policy.