For the reproduction of particularly low frequencies a special loudspeaker is required developed especially for this purpose.
Subwoofers can cover all demands on bass reproduction when fitted into a suitable enclosure.
GROUND ZERO offers different models for each application. Passive subwoofers can be powered with an additional amplifier, individually.
Recommended amplifier data can be found in the manual, which is available for download.

Passive Subwoofer Boxes
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GZIB 200XBR
20 cm / 8″ vented subwoofer loaded enclosure
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GZIB 250XBR
25 cm / 10″ vented subwoofer loaded enclosure
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GZIB 300XBR
30 cm / 12″ vented subwoofer loaded enclosure
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GZIB 2.300XBR
2x 30 cm / 12″ vented subwoofer loaded enclosure
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GZIB 3000XSPL
30 cm / 12″ vented SPL subwoofer loaded enclosure
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GZIB 2.3000XSPL
2x 30 cm / 12″ vented SPL subwoofer loaded enclosure