K-3 Ultra-hhigh frequency compression unit Description 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°). FEATURES » Ultra-hhigh frequency bullet compression tweeter » 40° x 40° nominal dispersion » 40 W program power handling » 1.75” diaphragm SPECIFICATIONS 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) Directivity: Q (Rθ)Q: DiD: (average, 6.3 to 16 kHz) Diaphragm Material and Thickness: Voice Coil Material: Voice Coil Diameter: Voice Coil Former Material: Phase Plug: Magnetics: Flux Density: Input Connection: Polarity: Dimensions (H x W x D): Minimum Baffle Cutout Diameter: Weight: Shipping Weight: 20 W 40 W >80 W 4 k - 23k Hz 8 Ω, range dependent, see Fig. 2 6Ω 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) Kapton® 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. Mounting 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. Impedance Figure 2 shows impedance with frequency. Distortion 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. 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. Polar Response Figure 6 shows the one octave band polars for the indicated frequencies. Full scale is 50 dB, 5 dB per division. TE/013-02 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 http://www.dasaudio.com 05/02 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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