The Penton Audio USA CCS series high performance closed-back ceiling speaker is designed for high-end audio installation where full impact bass output along with high sound pressure levels is imperative. The speaker component is situated in a sealed metal back-box with a UL Plenum compliant wire connection on the back of the back-box. Installer friendly phoenix style terminal blocks quickly and easily connect to the speaker and also offer a pass-through connection for continuing the line to other speakers in the system. The unit uses a 4-inch long throw low frequency driver along with a 1-inch tweeter mounted on axis for single point sound output. A bass port on the front of the baffle serves to further extend the low frequencies of this speaker. Transformer selection is completed via a screwdriver adjustable dial on the front of the baffle easily accessible by removing the grille. With a maximum 30W transformer tap selection this speaker offers unique sonic qualities along with a substantial sound pressure level.