PBN Audio in Alpine designs and hand-assembles high-performance loudspeakers, amplifiers, and turntables from its Arnold Way facility, anchoring a niche audiophile manufacturing presence in East County San Diego. The Montana loudspeaker line has earned placement on Stereophile's Recommended Components list, with custom builds supplied to home-theater installers such as Evolution Home Theatre, Inc. in Lakeside for reference-grade residential cinema systems. Founder Peter B. Noerbaek engineers each cabinet with non-parallel, mass-loaded walls to eliminate standing-wave resonance, finishing enclosures in piano-black lacquer or exotic hardwood veneers. The product catalog extends from bookshelf monitors to floor-standing concert-hall systems, and the Custom Shop builds mastering-studio monitors for recording facilities including FONO sound STUDIO on Lindo Lane in Lakeside. The GrooveMaster turntable series retrofits classic Denon DP-Series chassis with upgraded tonearm bearings, outboard power supplies, and custom-wound MC cartridge stages for sub-0.3% wow-and-flutter performance.