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

2.1. Product description
The Yi-SUB is a compact high performance cardioid subwoofer
designed to supplement the d&b Yi-Series cabinets.
The Yi-SUB houses two long excursion neodymium drivers in an
integrated cardioid setup: an 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.
The frequency response extends from 39 Hz to 140/110 Hz.
Cardioid dispersion
Cardioid dispersion avoids unwanted energy behind the system
and greatly reduces the excitation of the reverberant field at low
frequencies providing the greatest accuracy of 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 subwoofers and a side
wall. When positioned in front of walls, the minimum distance to
rear walls is maintained by the wheels mounted at the rear of the
cabinet.
Yi-Series 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 Yi-SUB
cabinets in ground stacked applications.
A detailed description of the Yi-Series rigging components is given
in the Yi-Series Rigging manual which is provided with the
corresponding Yi Mounting frames.
A detailed description of planning and designing Yi arrays is given
in the technical information "TI 385 d&b Line array design,
ArrayCalc" which is provided with the Y Flying frame.
The d&b ArrayCalc simulation software can be downloaded from
the d&b website at www.dbaudio.com .
Cardioid dispersion pattern
2. Yi-SUB loudspeaker
d&b Yi-SUB Manual 1.1 en 5