Oliver's Audio Passion - 2D QRD N73 built with my "Diffuser Calculator" mobile application, in Shanghai! Video: https://youtu.be/LhbB3s4SByY | Facebook
QRDUDE Acoustic Design Software - YouTube
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Sale QRD 2D speaker alternative to Hofa diffuser
From you – Diffuser Calculator
How to Build 2D QRD23 Diffuser Using Mobile Application (Diffuser Calculator) - YouTube
Oliver's Audio Passion - 2D QRD N23 diffuser made by Branislav G. from Slovakia, using my Diffuser Calculator app 😎 🛒 Application ---> https://play.google.com/store/apps/details?id=acoustic.oliver.diffusers&hl=en_US | Facebook