Ultra-high frequency bullet compression tweeter » 40° x 40° nominal

Ultra-high frequency bullet compression tweeter » 40° x 40° nominal
Ultra-hhigh frequency compression unit
The D.A.S. K-3 is a compact sized
ultra-high frequency compression unit.
High efficiency and narrow coverage
characteristics result in maximum
sound pressure levels on axis.
The K-3's very high frequency response makes it well suited for
extending the bandwidth beyond that
normally associated with a
compression driver and horn set.
Nominal dispersion angle is 40°. If a
wider coverage is desired, two units
may be utilized and splayed 20° (+10°
and -10°).
» Ultra-hhigh frequency bullet compression tweeter
» 40° x 40° nominal dispersion
» 40 W program power handling
» 1.75” diaphragm
AES RMS (Average) Power HandlingR:
Program Power HandlingP:
Peak Power HandlingK:
Frequency RangeF:
Nominal Impedance,, Minimum Impedance:
Nominal voice coil resistance:
On-aaxis nominal SPL 2.83V / 1mS:
Minimum Recommended Xover Frequency:
-66 dB BeamwidthsB:
(average, 6.3 to 16 kHz)
Q (Rθ)Q:
(average, 6.3 to 16 kHz)
Diaphragm Material and Thickness:
Voice Coil Material:
Voice Coil Diameter:
Voice Coil Former Material:
Phase Plug:
Flux Density:
Input Connection:
Dimensions (H x W x D):
Minimum Baffle Cutout Diameter:
Shipping Weight:
20 W
40 W
>80 W
4 k - 23k Hz
8 Ω, range dependent, see Fig. 2
108 dB SPL
6 kHz
38º (+16º,-15º) Horizontal
38º (+16º,-15º) Vertical
40.6 (+17.3, -19.2)
16.1 dB (+1.5, -2.8)
Aluminium, annular / 0.05 mm (0.0019 in)
Edge-wound, aluminium, copper-clad
44 mm (1.73 in)
Bullet-type, aluminium
Anisotropic Barium Ferrite
1.7 T
Push terminals, 4 mm diameter
Positive voltage to red terminal moves diaphragm
toward phase plug
144 x 144 x 86 mm (5.7 x 5.7 x 3.4 in)
137 mm (5.4 in)
2.3 Kg (5.1 lbs)
2.6 Kg (5.7 lbs)
R As per AES2-1984 (ANSI S4.26-1964), re. the minimum impedance, based on a 2 hour test continuously applying 6 dB crest factor pink
noise band-limited to 7-20 kHz. Temperature rise of 37ºC, infra-red probe.
P Conventionally 3 dB higher than the average measure.
K Corresponds to the signal crests for the test described in R.
F As per IEC 268-5 (1989), re. a one octave band centred at 10k Hz.
S IEC average 6.3 to 20k Hz.
B Average of one-third octave band measures. One and one-third octave bands comply to ANSI S1.11-1986
Q Computed from two degree resolution vertical and horizontal one-third octave polars using sinusoidal weighting. D 10 log(Q).
Polars were measured at two degree angular and 1/24th octave frequency resolution.
AUTOPOL, a platform consisting of custom and customized hardware and software, was used for the automated high-resolution acquisition
and post-processing of directivity data. The digital storage of the data allows further processing and conversion to other software formats.
Modelling data can be found at http://www.dasaudio.com/.
Flat copper-clad aluminium wire is
used for the voice coil, which is
wound onto a high temperature Kapton
former, and in turn bonded to a
resonance-free annular diaphragm.
Mount externally to enclosures by four
5 mm diameter screws, with no need
for an additional support.
Frequency Response
Figure 1 shows the fundamental frequency
response at 1 m of a K-3 unit radiating in an
anechoic environment and driven by a 2.83V
swept sine signal.
Figure 2 shows impedance with frequency.
Figure 3 shows the Total Harmonic Distortion
Plus Noise (black, solid), Second Harmonic
Distortion (grey, solid) and Third Harmonic
Distortion (dotted) curves for a K-3 unit driven
at 10% of its nominal power handling rating.
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
Polar Response
Figure 6 shows the one octave band polars for
the indicated frequencies. Full scale is 50 dB, 5
dB per division.
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
America, Inc. Sunset Palmetto Park 6816 NW 77th Court, Miami, FL
33166, U.S.A. Tel. 305 436 0521 - Fax. 305 436 0528
NOTES. 1.Frequency response : referred to 1 m; one-third
octave smoothed for correlation with human hearing. 2.In
practice, cable and connector impedance need to be added.
3.Harmonic distortion components are not plotted beyond 20
kHz; THD+N is 22 Hz - 22 kHz filtered; 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. All other
characteristics plotted vs. frequency use 1/24th octave
resolution. Notches of less than 1 dB below goal level may be
ignored when calculating beamwidths. 5.Directivity factor and
index were computed from two degree resolution vertical and
horizontal polars using swept sine signal. 6.Polars were
acquired by placing the unit on a computer controlled turntable
inside our anechoic chamber. Measurement distance was 3 m.
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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