The high-performance O 900 studio subwoofer is the ideal complement for the O 500 C studio monitor. Precise bass reproduction is achieved down to 17 Hz (– 1.5 dB). The 120 liter cabinet gives a high maximum sound pressure output with a flat frequency response. This is due to the ingenious enclosure design, as well as the use of uncompromisingly constructed drivers.
The O 900 can use the analog subwoofer output of the O 500 C and an external amplifier
(KPA 2220 recommended).

Block Diagram (Download)

O 900 + O 500 C
Acoustical
-3 dB free field frequency response	15 Hz - 220 Hz, ± 3 dB
Pass band free field frequency response	17 Hz - 200 Hz, ± 1,5 dB
Self generated noise level at 10 cm	< 20 dB(A)
THD < 0,5% at 1 m distance from	101 dB SPL (> 30 Hz)
Max. SPL in half space at 3% THD in 1m	116.4 db SPL
Max. SPL averaged between	40 Hz and 90 Hz
Electrical
Recommending signal processing	O 500 C Subwoofer output
Recommend amplifier	KPA 2220
Mechanical
Cabinet surface	Painted
Color standard	Anthracite (RAL 7021), white (RAL 9010), silver (RAL 9006)
Baffle cover	Optional removable metal grille
Drivers	Magnetically shielded
Woofer	2 x 300 mm (12")
Mounting points	Supporting stand socket
Height x width x depth	950 x 400 x 512 mm (37.4" x 15.8" x 20.2")
Net volume internal	120 liters
Weight	52 kg (114.5 lbs) w/o electronics
Accessories	LH 33, LH 37, FO 900

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