Topakustik® Classic - Grooved Solutions A clean, linear approach to acoustics. Profiles are created with 2, 3, or 4mm grooves with different spacing options. Topakustik Micro ProductsTopakustik Perfo ProductsNarrow SpacingType 5/15mm Flat Area1mm GrooveType 6/26mm Flat Area2mm GrooveType 8/38mm Flat Area3mm GrooveType 9/29mm Flat Area2mm GrooveMedium SpacingType 12/412mm Flat Area4mm GrooveType 13/313mm Flat Area3mm GrooveType 14/214mm Flat Area2mm GrooveType 18/318mm Flat Area3mm GrooveType 19/219mm Flat Area2mm GrooveWide SpacingType 28/428mm Flat Area4mm GrooveType 29/329mm Flat Area3mm GrooveType 30/230mm Flat Area2mm GrooveSpecial TypesType 9/2HR9mm Rounded Area2mm GrooveType 14/2HR14mm Rounded Area2mm GrooveType RRandom Groove Size