Rab1815 - Cardioid Sub-Bass - Montarbo PALCO PLUS User Manual

user's manual user's manual
Figure 12. RAB1815
Figure 13. RAB1815 rear panel
Figure 14. An array of 4 RA16
speakers stacked on a model
B1 BUMPER and an RAB1815
english english
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2.4 - RAB1815 - cardioid sub-bass unit (figure 12)
Cardioid sub-bass, designed to extend the low frequency range of the
PALCOPLUS system to 30 Hz.
It employs two low-frequency drivers: an 18-inch (bass-reflex-loaded)
and a 15-inch (horn-loaded), both featuring a 4-inch, long-excursion voice
coil, a dual-spider and a super-ventilated neodymium magnet.
The synergy between the drivers results in a "fast" and accurate bass
response. The drivers' different acoustic loads compensate their frequency
response and extend and correct the system's response in the very low
range, thus increasing its throw and directivity.
The polar response is "cardioid" within a large band. A conventional
woofer has a response that is practically omni-directional. Instead RAB1815
has a "directive" response, meaning that the acoustic energy is directed
only where it is needed. The reduced emission from the enclosure's rear
helps attenuate the low frequency acoustic feedback on stage.
For each module a two channel power amplifier (2 x 1600 W / 4 ohm) is
specified; this amplifier is driven by the dedicated LM24 controller.
Connection to power amplifiers is by an 8-pole
(figure 13). For wiring details, refer to chapter 5.
One RAB1815 sub-bass unit may be used as a base for a ground or stage
level stacked array of RA16 speakers, installed on top of BUMPER model B1
(figure 14).
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socket
neutrik speakon