Valcom VB-S11 Surface Mount Backbox
The VB-S11 is a surface mount backbox built for column-mounted Valcom paging and intercom speakers where a flush or recessed install isn't an option — masonry walls, block construction, or retrofit jobs where cutting into the wall surface isn't practical. It measures 11.50in H x 11.50in W x 3.00in D (29.21cm x 29.21cm x 7.62cm) and weighs 2.60lbs (1.18kg), giving a column speaker a rigid, wall-standoff enclosure instead of an open-back mount against drywall or block.
Compatibility
The VB-S11 is built for Valcom column-style speakers that support surface backbox mounting, including models with microphone support for two-way paging. It's finished in white with a light texture powder paint, matching the standard housing color used across Valcom's Valcom catalog so the backbox doesn't stand out against the speaker it's paired with. Confirm your specific column speaker model lists surface backbox mounting as a supported configuration before ordering — not every Valcom speaker series uses this backbox geometry.
Installation Notes
Rated for indoor environments only — this is not a weatherproof enclosure, so keep it off exterior walls, loading docks, or unconditioned spaces exposed to moisture. Mounting hardware is available in metal (M) or plastic (P) variants depending on the wall substrate and load requirements, which matters when you're standing a steel-grille speaker off a block wall versus a drywall partition. The 3.00in depth is enough clearance for the backbox cavity to house wiring and connections behind the speaker without a custom cutout, which speeds install on paging retrofits where you're replacing an existing flush unit or adding coverage in a hallway or stairwell. For broader system planning — how many zones a backbox-mounted speaker run needs to cover — see the paging and intercom systems category and a PoE planning guide if the paired speaker runs on network power. Pair with a compatible Valcom mounting accessory or bracket if the install calls for additional standoff depth.
