WHD UPM 200-20 White, Broadband Built-in Ceiling LS System, Power: 6/8 W, Impedance: 20 Ω, Frequency range: 60 - 20,000 Hz, Without transformer, For ceiling thickness from 1 to 32 mm, Cut out: 175 × 167 × 188 mm, Low installation depth 54 mm, Very flat (5 mm), Water-resistant cone, Colour: RAL 9003 white,