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https://avantacoustics.com/team-member/andrew-j-vonfeldt-pe/ Andrew J. VonFeldt, PE - AVANT ACOUSTICS Aug 3, 2026 - Andrew VonFeldt, Associate Principal for AVANT ACOUSTICS, has been with AVANT since 2012 and is actively involved in room acoustic design and evaluation,... andrew jvonfeldtavantacoustics