One of the most compact in-ceiling speakers on the market, the SLM-5400-C features a shallow depth (50mm) with a fully enclosed backbox. Along with premium acoustics straight from the legendary Klipsch Reference 5000 architectural series, the SLM-5400-C brings high-performance acoustics in an extra slim package – for great sound where installation space is limited. The ultra-slim galvanized metal back box provides a fire-rated enclosure for excellent sound isolation from neighboring floors, while ensuring consistent acoustics and exceptional low frequency response from a compact speaker.