The OBC115C is a single-speaker bass cabinet built around a custom 15-inch Celestion Pulse XL 15.17 driver rated at 400 W. The speaker is voiced for deep lows, warm mids and a vintage-leaning character, and the enclosure is aimed at being lighter and more compact than larger cabs in the OBC range.

The cabinet is made from 18 mm high-density birch ply with a side-ported design intended to improve projection and low-frequency response. Skid-style feet and runners help couple the cab to the stage. Exterior finishing includes tough vinyl, a basketweave grille cloth with full-length coverage and picture-frame edging. It is available in Orange or Black.

Connection is by two parallel 1/4" jack inputs and Speakon input jacks. With an 8 ohm impedance it can be paired with a range of bass heads, and it can be used alone or stacked with a second cab for larger rigs.