R-18 Reference TFSJFT Introduction The R-18 is a high efficiency horn loaded subwoofer system designed for fixed installation applications where high sound pressure levels of bass response are required. The R-18 is part of the R-1000 system. Applications The horn loaded configuration of the R-18 provides enhanced acoustic coupling and efficiency as compared to traditional systems. The hard hitting bass response makes it ideal for club installations. Description FEATURES » » » » High efficiency horn loaded low frequency system 18" speaker 500 W power handling Rugged steel grille The R-18 houses a D.A.S. G-45 18" cone transducer. This long excursion driver features a 4" edgewound coil, massive magnet structure and carefully engineered cooling schemes, resulting in high power handling and low power compression. The 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 suspension in either the horizontal or vertical positions safe and simple. Loudspeaker components are protected by a heavy-duty steel grille sealed against corrosion using a polyamide powder coat finish. SPECIFICATIONS RMS (Average) Power HandlingR: Program Power HandlingP: Peak Power HandlingK: On-axis Frequency RangeF: Usable Frequency Range: Nominal Impedance: Minimum ImpedanceI: On-axis Sensitivity 1W / 1 mS: Rated Peak SPL at Full Power: Nominal -6 dB BeamwidthsB: (100 Hz octave) Enclosure Material: Finish: Transducers/Replacement Parts: Connector: Dimensions (H x W x D): Weight: Shipping Weight: 500 W 1000 W 2000 W 40 Hz - 750 Hz 35 Hz - 300 Hz 8Ω 7.6 Ω (at 73 Hz) 99 dB SPL 132 dB SPL at 1m 360° Horizontal 360° Vertical Wisa Birch plywood Black paint G-45/GM G-45 2 paralleled NL4 Speakon, wired to ±1 71 x 51 x 72 cm (28 x 20.1 x 28.4 in) 48 kg (105.12) 52 kg (114.2 lbs) 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 250 Hz. Half space anechoic. I In practice cable and connector impedance has to be added to all impedance values. S For the 160 Hz one octave band. B Average of one-third octave band measures. One and one-third octave bands comply to ANSI S1.11-1986. Placement As with any bass unit, the R-18’s low frequency output will benefit from placement against walls and/or floors. R-18 Frequency Response Figure 1 shows the frequency response at 1 m of a unit radiating to a half space anechoic environment and driven by a 1 W (2.83 V) swept sine signal. Impedance Figure 2 shows impedance with frequency. Distortion Figure 3 shows the 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.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. TE/045-01 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 6970 N.W. 50th St. Miami, FL 33166, U.S.A. America, Inc. Tel. +1 305 436 0521 - Fax. +1 305 436 0528 http://www.dasaudio.com 09/99 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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