This 2x48 audio patchbay is wired to DB25 connectors. The Quick-Switch normalling allows you to set the individual normals on a per jack pair basis. This enables you to full-normal (FN), half-normal (HN) or non-normal (NN) by sliding the switches into the appropriate position. You also have grounding options: isolated, bussed, or grounds vertically strapped (GVS). Audio Accessories, Inc. manufactures a standard line of audio long-frame 1/4" jacks/Batam and panels. All assemblies are made to the exacting specifications you've come to rely on over the past 50 years. Each panel is machined in-house from a single solid piece of 19" wide phenolic with a smooth black suede finish on the panel face. Each jack is hand-adjusted and inspected to ensure years of fail-proof patching.