S series - DAS Audio
18S
Very Low Frequency Transducer
S series
Description
The D.A.S. 18S is a high excursion 18”
diameter cone loudspeaker with 4”
diameter voice coil.
It features C.A.F. (Controlled Air Flow),
which conjugates centre pole piece and
side slot convection cooling to provide
high power handling and low power
compression.
Exclusive curing techniques are utilized
to create an indestructible bond
between the copper voice coil and its
fibre-glass based support.
The computer designed injected
aluminium basket supplies rigidity and
mechanical grounding.
A double spider configuration is used for
excursion control at high power levels.
FEATURES
» Very Low frequency 18” cone loudspeaker
» 1600 W program power handling
» 4” voice coil
» Ceramic magnetic structure
» Centre pole piece and side slot convection cooling (C.A.F.)
SPECIFICATIONS
AES RMS (Average) Power HandlingR:
Program Power HandlingP:
Peak Power HandlingK:
Sensitivity:
Nominal Impedance:
Nominal Frequency Range:
Voice Coil:
Voice Coil Diameter:
Cooling:
Frame:
Spider:
Diaphragm:
Magnetics:
Flux Density:
Input Connection:
Polarity:
Recommended Baffle Cutout Diameter:
Weight:
Shipping Weight:
R
P
K
800 W
1600 W
3200 W
98 dB SPL, 1W/1m
8Ω
25 Hz - 2 kHz
Cu, edgewound
102 mm (mm)
C.A.F. (Controlled Air Flow), pole piece and
side slot convection
Cast aluminium
Double
Straight, ribbed
Anisotropic Barium Ferrite
1.02 T
Push terminals, 4 mm diameter
Positive voltage to red terminal moves
diaphragm forward
415 mm
12.2 kg
(5.5 lbs)
13.6 kg
(6.2 lbs)
Based on a 2 hour test continuously applying 6 dB crest factor pink noise bandlimited to 50-500 Hz.
Conventionally 3 dB higher than the average measure.
Corresponds to the signal crests for the test described in R.
Applications
Sub-woofer. Suitable for high power low
frequency enclosures.
Frequency Response
Figure 1 shows the on-axis (black) and 45degree (grey) frequency response at 1 m of a
unit flush on a measurement baffle and
radiating to an anechoic environment and
driven by a 2.83 V swept sine signal.
Impedance
Figure 2 shows impedance with frequency of a
unit suspended in free air.
Distortion
Figure 3 shows the Second Harmonic Distortion
(grey) and Third Harmonic Distortion (dotted)
curves for unit mounted on the measurement
baffle and driven at 10% of its power handling.
NOTES. 1.Frequency response: referred to 1 m; low-end
obtained through the use of near field techniques; the large
measurement baffle provides results akin to mounting the
speaker in a diffraction free closed box with internal volume of
320 litres or larger. 2.In practice, cable and connector
impedance need to be added. 3.Harmonic distortion
components are not plotted beyond 20 kHz.
Product improvement through research and development is a
continuous process at D.A.S. Audio. All specifications subject
to change without notice.
Thiele-S
Small Parameters
Small-S
Signal
Fs: 33 Hz
Qts: 0.329
Qes: 0.346
Qms: 6.924
ηo: 2.98%
Vas: 303 litres
Re: 6.3 Ω
SD: 0.1164 m2
(Preconditioning : 1 hour, AES power test at -3dB rated power)
Large-S
Signal
Xmax: 8 mm (0-pk)XM
VD: 0.344 dm3 (0-pk)
XM
Calculated as (Hvc-Hag)/2+Hag/4
ADDITIONAL DATA
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
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
08/2002
TE/18s-00
Effective piston diameter: 385 mm
Mms: 150 gr
Cms: 157 mm/N
Voice coil diameter: 102 mm
Voice coil winding depth, Hvc: 21 mm
Voice coil length: 36.0 m
Top plate thickness at voice coil, Hag: 10 mm
Displacement limit: 31 mm (pk-pk)
Minimum impedance: 6.7 Ω at 153 Hz
BL: 23.7 T.m
Spider suspension: polycotton
Surround suspension: polycotton
Voice coil support: GFRP (glass fibre
reinforced polymer)
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