Sonus Faber Gravis i active sub woofer

Gravis I 
These speakers have been designed to be easily integrated into every living environment and ideally matched with almost every kind of audio and audio/video system. In addition Gravis I and II are the perfect match for their loudspeaker siblings: the Sonus faber Sonetto Collection.
FEATURES
Gravis I and II deliver incredibly powerful
performance from compact subwoofers.
DESIGN
The connection with the Sonetto family is clear: from the leather top, soft to the touch and embellished by the hot branded Sonus faber logo, to the finishes; Matte White, Piano Black, Wood and Wengè.
SPEAKER UNIT AND SOUND SYSTEM GRAVIS I
A 8” Ultra Long Throw down-firing speaker unit, along with a high current 150W Class AB amplifier allowing it accurate and expressive bass reproduction well beyond its class.
TECHNICAL SPECIFICATIONS
SYSTEM
Sealed box loading, down firing active subwoofer

SPEAKERS
1 x 210 mm (8”) long throw, treated paper cone, wide rubber surround LF unit

AMPLIFICATION
High linearity Class AB
150 W (nominal), 250 W (peak)

FREQUENCY RESPONSE
@ - 6dB, from 30 Hz to Fc (user adjustable)