DIFFUSION SCATTER PANEL (QRD)

HTA-QRD-230

PHYSICAL SPECIFICATION

Diffuser type

Material

Prime number (N)

Period width

Well depth (max)

Overall depth

Standard panel size

Weight

Finish options

Fire rating

Mounting

Quadratic Residue Diffuser (QRD), 1D

18 mm MDF with hardwood fin option

7 — seven-well sequence

230 mm

155 mm

175 mm (inc. back panel)

460 × 920 mm (2 periods)

≈ 11 kg per panel

Raw MDF, spray painted, timber veneer

Class B (Class A treated on request)

French cleat, Z-clip, or adhesive anchor

 

RATED PERFORMANCE

Design frequency (f0)
Upper frequency limit
Scattering coefficient (ds)
Absorption coefficient
Test standard

750 Hz
8 kHz
≥ 0.7 at 1 kHz (ISO 17497-1)
0.35 – 0.45 (residual, not rated)
ISO 17497-1 / ASTM C423

 

Installation note: Deploy on rear walls and behind the mix position. Alternate with absorber panels in a 50/50 ratio for controlled ambience. Not a substitute for low-frequency treatment — pair with bass traps in all corners.