For areas where it’s critical to scatter sound – not just absorb it – look no further than Simplified Acoustics SDP SiM Panels. SDP stands for absorption, diffusion and scattering. The SDP acoustic panel uses a double perforated fiberglass core with an internal septum. Simplified Acoustics offers unbeatable choice of fabrics from the top brands – including 300+ standard options and an infinite number of custom selections.