d&b 27S-SUB - Manual (Page 5)

2.1. Product description
The 27S-SUB and 27A-SUB are compact high performance
cardioid subwoofers for use with d&b xS-Series and xA-Series
loudspeakers. The cabinets house two long excursion neodymium
drivers in an integrated cardioid setup: a 15“ 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 27A-SUB incorporates the same acoustic components as the
27S-SUB, however, the cabinet is equipped with an integrated
rigging system for the design of vertical arrays. The 27A-SUB can
be combined with 10A and 10AL loudspeakers.
The frequency response extends from 40 Hz to 140/100 Hz.
The enclosures are constructed from marine plywood with an
impact resistant black paint finish. The fronts of the cabinets are
protected by a rigid metal grill backed by an acoustically
transparent foam.
The 27S-SUB is equipped with four rubber feet to prevent cabinet
movement and protect the bottom panel against scratching.
The cabinets are Ball Impact Resistant according to DIN 18032-3.
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. 27S
and 27A subwoofers can be used as stand-alone systems or in
stacked or flown combinations with a minimum distance of 60 cm
(2 ft) between adjacent cabinets or to side walls. When set up in
front of walls, the minimum distance from the cabinet rear panel to
the wall is 15 cm (0.5 ft).
27S-SUB rigging components
The 27S-SUB side panels are each equipped with a pair of M10
threads to accept the Z5410 Horizontal bracket 18S/27S. The
threaded inserts are covered by dummy caps in cabinet color. The
caps must be removed before mounting any accessories.
27A-SUB rigging components
27A-SUB cabinets are connected to form a vertical array each
using the Z5418 Connector plates xA-SUB. Up to four 27A-SUB
cabinets can be connected. When integrated at the top of a 10A
or 10AL array, up to two 27A-SUB cabinets can be combined with
up to six 10A/10AL cabinets.
Fig. 1: 27S-SUB/27A-SUB loudspeaker
Rigging examples:
27S-SUB ceiling mounted with Z5410 Horizontal bracket 18S/27S.
10AL/27A-SUB array.
Fig. 2: Cardioid dispersion pattern
2. 27S-SUB/27A-SUB loudspeaker
d&b 27S-SUB/27A-SUB Manual (1.2 EN) 5