d&b Vi-SUB - Manual (Page 5)

2.1. Product description
The Vi-SUB is a compact high performance cardioid subwoofer for
use with d&b Vi-TOP cabinets.
The Vi-SUB houses two long excursion neodymium drivers in an
integrated cardioid setup: a 18“ driver in a bass-reflex design
facing to the front and a 12” driver in a two chamber bandpass
design radiating to the rear. The arrangement and tuning provide a
cardioid dispersion pattern using a single amplifier channel.
Its frequency response extends from 37 Hz to 115/95 Hz.
The cabinet is constructed from marine plywood and has an impact
and weather protected PCP (Polyurea Cabinet Protection) finish.
The front of the loudspeaker cabinet is protected by a rigid metal
grill backed by an acoustically transparent foam.
Cabinet options
The WR option enables operation of loudspeakers in changing
ambient conditions, however it is not intended to enable
permanent, unprotected operation of loudspeakers outdoors.
–
Provide an additional cover over the entire loudspeakers/
array.
Vi rigging components and arrays
Cabinets are mechanically connected using the rigging strands on
both sides of the cabinet front and a central strand at the rear of
the cabinet. All necessary rigging components are mounted to the
cabinet and fold out or slide out when needed. The rigging
components are also intended to interconnect and secure Vi-SUB
cabinets in ground stack applications.
A detailed description of the Vi rigging components is given in the
Vi Rigging manual which is provided with the Z5387.xxx
Mounting frames.
A detailed description of planning and designing V arrays is given
in the technical information "TI 385 d&b Line array design,
ArrayCalc" which is provided with the V Flying frame.
The d&b ArrayCalc array calculator can be downloaded from the
d&b website at www.dbaudio.com .
Cardioid dispersion
Cardioid dispersion avoids unwanted energy behind the system
and greatly reduces the reverberant field at low frequencies
providing highest accuracy in low frequency reproduction. The
subwoofers can be used as stand-alone solutions or in stacked
combinations with a minimum distance of 60 cm (2 ft) between
adjacent cabinets or between the cabinets and a side wall. When
set up in front of walls, the minimum distance to rear walls should
be 30 cm (1 ft).
Fig. 1: Vi-SUB loudspeaker
Fig. 2: Cardioid dispersion pattern
2. Vi-SUB loudspeaker
d&b Vi-SUB Manual (1.1 EN) 5