Sub-18F
Introduction
The D.A.S. Sub-18F is a bass-reflex sub-
woofer system for use in systems where
bass reinforcement is required with or
without the addition of an extra amplifier.
Applications
The Sub-18F is designed for applications
such as portable music applications, DJ, and
clubs.
Description
The unit utilizes a high efficiency 18" low
frequency speaker with 4" voice coil
configured as a direct radiator. Pole piece,
side slot and direct convection cooling
provide high power handling and low power
compression.
A true, first order, crossover filter providing
impedance separation is built into the unit.
This allows for subwoofer reinforcement
using a single amplifier for both the mid-high
boxes and Sub-18F. For active use, the low-
pass portion can be internally defeated.
The enclosure is manufactured from MDF
wood and is finished with a hard wearing
catalyzed polyurethane paint that permits
FEATURES color adaptations and provides weather
resistance. Loudspeaker components are
» Direct radiator sub-w
woofer protected by a heavy-duty steel grille sealed
against corrosion using a poliamide powder
» Internally defeatable built-iin crossover filter coat finish.
» 18" low frequency speaker Placement
» 500 W power handling As with any bass unit, the Sub-18F’s low
frequency output will benefit from placement
against walls and/or floors.
SPECIFICATIONS The top panel contains a standard 35 mm
diameter pole mount socket for use with
RMS (Average) Power HandlingR: 500 W metal posts for mounting full-range D.A.S.
Program Power HandlingP: 1000 W systems above the SUB-18F sub-woofer
Peak Power HandlingK: 2000 W unit.
On-aaxis Frequency RangeF: 32 Hz - 225 Hz
Nominal Impedance: 8Ω
Minimum ImpedanceI: 7.7 Ω (at 33 Hz).
Low-pass defeatedX: 6.5 Ω (at 35 Hz)
On-aaxis Sensitivity 1W / 1 mS: 98 dB SPL
Rated Peak SPL at Full Power: 131 dB SPL at 1m
Nominal -66 dB BeamwidthsB: 360° Horizontal
(100 Hz octave) 360° Vertical
Enclosure Material: MDF
Finish: Black catalyzed polyurethane paint
Transducers/Replacement Parts: 18H/GM 18G
Connectors: NL4 Speakon, wired to ±1
2 paralleled inputs
1 high-pass satellite output
Dimensions (H x W x D): 64 x 55 x 53 cm (25.5 x 22 x 21 in)
Weight: 39.3 kg (86.5 lbs)
Shipping Weight: 42.3 kg (93 lbs)
R Corresponds to the AES power handling rating for the component, based on a 2 hour test using a 6 dB crest factor bandlimited pink noise
signal.
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 80 Hz. Half space anechoic.
I In practice cable and connector impedance has to be added to all impedance values.
X For use with an external electronic crossover, we strongly recommend defeating the built-in low-pass filter. Simply open the wooden center
back panel to expose the passive filter network and unplug the faston connector from the "OUT BASS +" position and plug it into the "OUT
SUB ACTIVE +" connection.
S For the 100 Hz one octave band.
B Average of one-third octave band measures.
One and one-third octave bands comply to ANSI S1.11-1986.
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/sub18f-00
D.A.S. Audio, S.A.
05/03
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
Sunset Palmetto Park 6816 NW 77th Court, Miami, FL
America, Inc.
33166, U.S.A. Tel. 305 436 0521 - Fax. 305 436 0528
http://www.dasaudio.com
