ลำโพงเพดาน  ยี่ห้อ Bosch รุ่น LC2-PC30G6-4

The LC2‑PC30G6‑4 is a 4‑inch two‑way Premium-sound Ceiling Loudspeaker which provides; wide dispersion, high efficiency, high maximum output, ease‑of‑installation, and wide‑range reproduction of music and voice.
It consists of a baffle assembly, grille, back‑can enclosure, 4‑inch coax two‑way loudspeaker and internal output‑power matching transformer. The loudspeaker features a waveguide coupled titanium coated dome tweeter.
The rear enclosure provides an optimum internal volume for extended low frequency performance. The loudspeaker utilizes a second order crossover network at 3.3 kHz, with a comprehensive protection circuit to protect the network, woofer, and tweeter drivers from excessive power levels.
The loudspeaker can be installed optionally with the LC2‑PC60G6‑10 ceiling subwoofer to enhance the low frequency reproduction down to 45 Hz.

Technical specifications
Electrical

• Maximum power :    50 W
• Rated power:   30 / 15 / 7.5 / 3.75 W (1.88 W only,70 V).
• Sound pressure level at 30 W / 1 W (1 kHz, 1 m):   101 / 86 dB (SPL)
• Effective frequency range(-10 dB):   65 Hz to 20 kHz
• Coverage (conical):   130°
• Rated voltage:   70 V or 100 V
• Rated impedance :  167 or 333 or 8 ohm
• LF transducer:    100 mm (4 in.) Polypropylene cone
• HF transducer:    19 mm (0.75 in.) Ti Mylar laminate
• Connector:    3‑pole screw terminal block

Mechanical

• Diameter :   210 mm (8.3 in)
• Maximum depth :   176 mm (6.9 in)
• Ceiling thickness :   4 to 25 mm (0.16 to 1.00 in.)
• Mounting cut‑out:    183 + 5 mm (7.188 + 0.20 in.)
• Material
• Baffle:    ABS (UL94V0)
• Back‑can:    Zinc‑plated steel
• Grille:    Powder coated steel
• Weight:    2.7 kg (6.0 lb)
• Color:    White (RAL 9010)

Environmental

• Operating temperature:   -25 ºC to +55 ºC (-13 ºF to +131 ºF)
• Storage and transport temperature:   -40 ºC to +70 ºC (-40 ºF to +158 ºF)
• Relative humidity:   <95%