High-fidelity music and speech reproductionSupplied with adjustable wall‑mounting bracketSelf‑restoring overload protectionProvision for inside mounting of the optional line/loudspeaker supervision boardEN 54‑24 certifiedProduct: LB1‑UM20E‑(D/L), LB1‑UM50E‑(D/L)Description: Premium‑sound Cabinet LoudspeakerRated Power (PHC): 20 W, 50 WPower Tapping: 20 / 10 / 5 / 2.5 W, 50 / 25 / 12.5 / 6.25 WSound Pressure Level at Rated Power / 1 W (1 kHz, 1 m): 101 / 88 dB (SPL), 108 / 91 dB (SPL)Sound Pressure Level at Rated Power / 1 W (1 kHz, 4 m): 87 / 74 dB (SPL), 94 / 79 dB (SPL)Effective Frequency Range (-10 dB): 90 Hz to 20 kHzHorizontal Coverage (1/4 m): 174° / 136°, 186° / 126°Vertical Coverage (1/4 m): 127° / 141°, 84° / 62°Rated Input Voltage / Impedance (LB1‑UM20E‑D/L):20 W: 12.65 V – 8 Ω / 250 Ω / 500 Ω10 W: – / 500 Ω / 1000 Ω5 W: – / 1000 Ω / 2000 Ω2.5 W: – / 2000 Ω / 4000 ΩRated Input Voltage / Impedance (LB1‑UM50E‑D/L):50 W: 20 V – 8 Ω / 100 Ω / 200 Ω25 W: – / 200 Ω / 400 Ω12.5 W: – / 400 Ω / 800 Ω SKU: BOS.LB1-UM20E-D Color: Black Amperage Rating: 15 A Operating Relative Humidity: < 95% Storage Temperature: -40 °C ... 70 °C Operating temperature: -25°C To +55°C Dimensions: 274x160x180mm Brand: BOSCH Supplier Part Number: LB1-UM20E-D