Basis Gravis 200 — specifications
Basis Gravis 200.
The dedicated subwoofer: a sealed enclosure in dark marble, with the driver facing the floor. In classical architecture the basis is what a stele stands on — Basis Gravis completes Stele Lucis by taking on the lowest octave.
Acoustics
- Load
- sealed
- Driver
- 200 mmfiring at the floor
- Extension (−3 dB)
- 47 Hzanechoic
- In room
- usable down to about 25 Hzdepending on room and position
- Slope
- 12 dB/oct
Amplification
- Power
- 200 Winto 4 Ω
- Crossover
- 40 – 200 Hzadjustable
- Phase
- 0 – 180°continuous
- Level
- adjustable
- Input
- line levelRCA · line signal
- Suggested crossover
- 80 – 90 Hzwith a pair of Stele Lucis
Materials
- Enclosure
- dark marblehoned
- Amplifier plate
- stainless steelbrushed
- Feet
- marble and adjustable spike45 mm of clearance
Dimensions
- Proportions
- golden ratioface 456 × 282 = φ · square plan
- Width · depth
- 456 · 456 mm
- Height
- 282 mmplus 45 mm of feet
- Mass
- 55 kg
How to read these numbers
Three figures to read properly.
On the anechoic 47 Hz
47 Hz anechoic tells only part of the behaviour. A subwoofer works in a room, not in an anechoic chamber: below the room’s first resonance the space returns a gain rising at about 12 dB per octave, and a sealed box falls with the same slope. The two slopes can compensate each other significantly, and in many rooms the response stays substantially flat down to about 25 Hz.
On the 45 mm feet
The 45 mm feet are a design dimension. The gap between the bottom and the floor must offer a passage area at least equal to the cone surface. Below 35 mm the subwoofer chokes itself.
On one being enough
One unit is enough. Below 80 Hz the ear barely localises the source: the block can stand where the sound needs it, not where symmetry would.
Where it goes.
Not where it looks right: where the sound needs it.
A subwoofer is positioned by ear, not by tape measure. Rooms are not all alike, and the right place is found in half an hour: follow our placement guide, or ask us to help.