Reference - DAS AUDIO Sound Products

Reference - DAS AUDIO Sound Products
R-18
Reference
TFSJFT
Introduction
The R-18 is a high efficiency horn loaded
subwoofer system designed for fixed
installation applications where high sound
pressure levels of bass response are
required. The R-18 is part of the R-1000
system.
Applications
The horn loaded configuration of the R-18
provides enhanced acoustic coupling and
efficiency as compared to traditional
systems. The hard hitting bass response
makes it ideal for club installations.
Description
FEATURES
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High efficiency horn loaded low frequency system
18" speaker
500 W power handling
Rugged steel grille
The R-18 houses a D.A.S. G-45 18" cone
transducer. This long excursion driver
features a 4" edgewound coil, massive
magnet structure and carefully engineered
cooling schemes, resulting in high power
handling and low power compression.
The compact enclosure is manufactured
from Wisa Birch plywood and is finished
with a hard wearing polyurethane paint that
permits color adaptations and provides
weather resistance. 16 integrated rigging
points that accept 10M forged steel
eyebolts make suspension in either the
horizontal or vertical positions safe and
simple. Loudspeaker components are
protected by a heavy-duty steel grille sealed
against corrosion using a polyamide powder
coat finish.
SPECIFICATIONS
RMS (Average) Power HandlingR:
Program Power HandlingP:
Peak Power HandlingK:
On-axis Frequency RangeF:
Usable Frequency Range:
Nominal Impedance:
Minimum ImpedanceI:
On-axis Sensitivity 1W / 1 mS:
Rated Peak SPL at Full Power:
Nominal -6 dB BeamwidthsB:
(100 Hz octave)
Enclosure Material:
Finish:
Transducers/Replacement Parts:
Connector:
Dimensions (H x W x D):
Weight:
Shipping Weight:
500 W
1000 W
2000 W
40 Hz - 750 Hz
35 Hz - 300 Hz
8Ω
7.6 Ω (at 73 Hz)
99 dB SPL
132 dB SPL at 1m
360° Horizontal
360° Vertical
Wisa Birch plywood
Black paint
G-45/GM G-45
2 paralleled NL4 Speakon, wired to ±1
71 x 51 x 72 cm
(28 x 20.1 x 28.4 in)
48 kg
(105.12)
52 kg
(114.2 lbs)
R Corresponds to the AES power handling rating for the component, based on a 2 hour test using a 6 dB crest factor pink noise signal
bandlimited to 50 Hz - 500 Hz.
P Conventionally 3 dB higher than the RMS measure, although this already utilizes a program signal.
K Corresponds to the signal crests for the test described inR.
F As per IEC 268-5 (1989), re. a one octave band centred at 250 Hz. Half space anechoic.
I In practice cable and connector impedance has to be added to all impedance values.
S For the 160 Hz one octave band.
B Average of one-third octave band measures.
One and one-third octave bands comply to ANSI S1.11-1986.
Placement
As with any bass unit, the R-18’s low
frequency output will benefit from placement
against walls and/or floors.
R-18
Frequency Response
Figure 1 shows the frequency response at 1 m
of a unit radiating to a half space anechoic environment and driven by a 1 W (2.83 V) swept
sine signal.
Impedance
Figure 2 shows impedance with frequency.
Distortion
Figure 3 shows the Second Harmonic Distortion
(grey) and Third Harmonic Distortion (dotted)
curves for a unit driven at 10% of its nominal
power handling rating.
Beamwidth
Figure 4 shows the -3, -6 and -10 dB horizontal
(solid) and vertical (dashed) beamwidth with
frequency curves. -6 dB ones are shown with
thicker traces for clarity.
Axial Directivity Q(Rθ) and Di
Figure 5 shows the above characteristics with
frequency. Thin continuous and dashed lines
show partial horizontal and vertical,
respectively, characteristics.
Polar Response
Figure 6 shows the one octave band horizontal
(solid) and vertical (dashed) polars for the
indicated frequencies. Full scale is 50 dB, 5 dB
per division.
NOTES. 1.Frequency response: referred to 1 m; low end
obtained through the use of near field techniques; one-third
octave smoothed for correlation with human hearing. 2.In
practice, cable and connector impedance need to be added.
3.Low frequency near-field techniques used. 4.Directivity
characteristics plotted with respect to frequency are the
average within the one-third octave bands of center
frequencies noted by the marks at the bottom of the graphs,
but are joined up for display purposes. Interpolation was
used below 100 Hz. All other characteristics plotted vs.
frequency use 1/24th octave resolution. Regions of less than
1 dB below goal level and sharp notches may be ignored
when calculating beamwidths. 5.Directivity factor and index
were computed from two degree resolution vertical and
horizontal polars using sinusoidal weighting. 6.Polars were
acquired by placing the unit on a computer controlled
turntable inside our anechoic chamber. Measurement
distance was 4 m.
TE/045-01
D.A.S. Audio, S.A.
C/. Islas Baleares, 24 - 46988 Fuente del Jarro - Valencia, SPAIN
Tel. 96 134 0525 - Tel. Intl. +34 96 134 0860 - Fax. 96 134 0607 - Fax. Intl. +34 96 134 06 07
D.A.S. Audio of
6970 N.W. 50th St. Miami, FL 33166, U.S.A.
America, Inc.
Tel. +1 305 436 0521 - Fax. +1 305 436 0528
http://www.dasaudio.com
09/99
Product improvement through research and development is
a continuous process at D.A.S. Audio. All specifications
subject to change without notice.
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