WORK IC 4 PRO R ลำโพงติดฝ้าเพดานขนาด 4 นิ้วแบบสี่เหลี่ยม 30วัตต์ 8โอห์ม 4" Dual cone woofer + ¾" TWT. 

Specs.

Type: Two way ceiling speaker.
Elements: 4" woofer + ¾" TWT.
Power taps (100 V line): 8 W (1k2 ohm) / 4 W (2k5 ohm) / 2 W (5 kohm) / 1 W (10 kohm).
Power taps (70 V line): 8 W (612 ohm) / 4 W (1k22 ohm)/ 2 W (2k5 ohm) / 1 W (4k9 ohm).
Low impedance output: 30 W at 8 ohm (direct connection to the woofer).
Frequency response: 80 Hz - 20 kHz.
Sensitivity (1W/1m): 88 dB.
Max SPL: 96 dB.
RAL colour code: RAL 9003.
Material (housing): ABS plastic.
Material (grille): Powder coated iron mesh.
Mounting dimensions(WxHxD): 190 x 190 x 30 mm. (max. ceiling thickness).
Dimensions(WxHxD): 210 x 210 x 115 mm.
Weight: 2.4 kg.