Sub-18 Reference
TFSJFT
Introduction
The D.A.S. Sub-18 is a bass-reflex sub-
woofer system for use in active systems
where bass reinforcement is required.
Applications
The Sub-18 is designed for applications
where high sound pressure levels of bass
frequencies are required such as sound
reinforcement in dance clubs.
Description
The Sub-18 houses a D.A.S. G-45 18" cone
transducer configured as a direct radiator.
This long excursion driver features a 4"
edgewound coil, massive magnet structure
and carefully engineered cooling scheme,
resulting in high power handling and low
power compression.
The ultra-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
FEATURES suspension in either the horizontal or vertical
positions safe and simple. Loudspeaker
» Direct radiator sub-woofer components are protected by a heavy-duty
steel grille sealed against corrosion using a
» 18" low frequency speaker poliamide powder coat finish.
» 500 W power handling
Placement
» Rugged steel grille
As with any bass unit, the Sub-18’s low
SPECIFICATIONS frequency output will benefit from placement
against walls and/or floors.
RMS (Average) Power HandlingR: 500 W The top panel contains two built-in female
Program Power HandlingP: 1000 W threads for use with a TRD-3, an optional 44
Peak Power HandlingK: 2000 W cm long metal stand for mounting D.A.S. full
On-axis Frequency RangeF: 35 Hz - 3.3 kHz range systems to the Sub-18 subwoofer
Usable Frequency Range: 35 Hz - 1 kHz enclosure.
Nominal Impedance: 8Ω
Minimum ImpedanceI: 6.3 Ω (at 40 Hz)
On-axis Sensitivity 1W / 1 mS: 98 dB SPL
Rated Peak SPL at Full Power: 131 dB SPL at 1m
Nominal -6 dB BeamwidthsB: 360° Horizontal
(100 Hz octave) 360° Vertical
Enclosure Material: Wisa Birch plywood
Finish: Black paint
Transducers/Replacement Parts: G-45/GM G-45
Connector: 2 paralleled NL4 Speakon, wired to ±1
Dimensions (H x W x D): 74 x 51 x 41 cm (29.2 x 20.1 x 16.2 in)
Weight: 36 kg
(79 lbs)
Shipping Weight: 38.8 kg
(85.2 lbs)
Accessories (optional): TRD-3 44 cm long stand
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 2000 Hz. Half space anechoic.
I In practice cable and connector impedance has to be added to all impedance values.
S For the 125 Hz one octave band.
B Average of one-third octave band measures.
One and one-third octave bands comply to ANSI S1.11-1986.
Sub-18
Frequency Response
Figure 1 shows the frequency response at 1 m
of a unit radiating to a half space anechoic envi-
ronment and driven by a 1 W (2.83 V) swept
sine signal.
Impedance
Figure 2 shows impedance with frequency.
Distortion
Figure 3 shows the Total Harmonic Distortion
Plus Noise (solid), 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.THD+N is 22 - 22 kHz filtered; 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.
Product improvement through research and development is
a continuous process at D.A.S. Audio. All specifications
subject to change without notice.
TE/009-04
D.A.S. Audio, S.A.
09/99
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
America, Inc. 6970 N.W. 50th St. Miami, FL 33166, U.S.A.
Tel. +1 305 436 0521 - Fax. +1 305 436 0528
http://www.dasaudio.com
