Instructions, Manuals and Specifications SPB-33-2018 Instructions Posted on August 29, 2018October 9, 2018 by Stephen Coghill 29 Aug Instructions for the assembly of the SPB-33-2018 Soundproof (er) Booth. Post Views: 265 SPB-66-2018 Instructions Soundproofing capacity of Voice Over MObile recording Studio – VOMO. Up to 10 dB noise reduction. Traffic noise. Airplane. Coffee shop tested.