User manual ELECTRO-VOICE AP2600A

[. . . ] The TL18-1 employs a single DL18W-WP 18-inch loudspeaker, in a 7. 4-ft³ FIGURE 1 Axial Frequency Response (anechoic environment, 1 watt/1 meter) FIGURE 2 TL18-1 One-Third-Octave Polar Responses (anechoic environment) FIGURE 3 TL18-1 One-Third-Octave Beamwidth vs Frequency (anechoic environment) FIGURE 4 TL18-1 One-Third-Octave Directivity vs Frequency (anechoic environment) FIGURE 5 TL18-1 Harmonic Distortion, 0. 1 Rated Power Input (40 watts), 10 Feet on Axis FIGURE 6 TL18-1 Harmonic Distortion, 0. 01 Rated Power Input (4 watts), 10 Feet on Axis enclosure. The TL18-1s large pumping capability and 40-Hz 3-dB-down point make it appropriate as a subwoofer for contemporary music playback and sound reinforcement. In the stepdown mode, the TL18-1s 28-Hz f3 makes it appropriate for very-low-frequency synthesized effects, down-tuned bass guitars, and approaches the depths of the symphony orchestra and pipe organ. (See Step-Down section. ) The enclosure is finished in black with a matching metal grille. [. . . ] A full spherical measurement system was used, which is compatible with the AcoustaCADDTM computer-aided design program. The filter applies a 6-dB-per-octave slope below 40 Hz and above 318 Hz. When measured with a one-third-octave constant-percentage analyzer, this filter produces a spectrum whose 3-dB-down points are at 100 Hz and 1, 200 Hz with a 3-dB-per-octave slope above 1, 200 Hz. This shaped signal is fed to the power amplifier with the continuous power set to provide 400 watts into the 6. 8-ohm EIA equivalent impedance (48. 2 volts rms). Amplifier clipping sets instantaneous peaks at 6 dB above the continuous power, or 1, 200 watts peak (96. 4 volts peak). This procedure provides a rigorous test of both thermal and mechanical failure modes. STEP-DOWN Step-down is a method of extending the lowfrequency response by increasing the power input to the system instead of the enclosure volume. In step-down mode, the enclosure is tuned at a lower-than-normal frequency. This increases the output at the new tuning frequency and reduces the output at the original tuning frequency. This smoothly falling amplitude response can be equalized to obtain a new 3-dB-down point in the region of 0. 7 that of the original. To obtain a similar response without step-down would require an enclosure with at least twice the volume. When DMAX is greater than one-quarter wavelength, which would occur if two TL18-1s were widely spaced, or at frequencies much above f even when closely spaced, the increase in acoustic output is limited to the 3-dB power-handling increase. At frequencies above the mutual coupling limit, f, stacking alters dispersion and increases onaxis sensitivity. In the 500-to-800-Hz range, a common crossover frequency for two-way sound reinforcement systems, two nearly adjacent cones have a coverage angle about half that of either cone alone. This is useful, for example, in more closely matching the typical 40° vertical dispersion of a high-frequency horn. (At frequencies much above 800 Hz, the concept of a halved coverage angle no longer applies, since the side lobes, which result from two sources that are not mutually coupled, increase in number and approach or equal the main lobe in amplitude. The number of lobes and their amplitude increases as frequency increases. ) SUSPENDING TL18-1 ENCLOSURES The TL18-1 has been developed in conjunction with the HS series of hanging hardware. The HS kit allows the TL18-1 to be hung safely in a variety of orientations. The combination of the correct HS kits and TL18-1 enclosure has been certified by an independent structural engineer to be safe and secure. Each HS kit consists of a steel tube, two brackets, two eyebolts and the necessary fasteners. The installer must assemble the HS kit by first drilling two holes into the TL18-1 enclosure, in predefined positions, and then screwing the brackets onto the steel tube, which passes through the enclosure. Full instructions and hole locations are included with each cabinet and HS kit. [. . . ] Any latex-, enamel-, or acrylic-based paint can be used. The special top layer of ProWood was developed in conjunction with Pittsburgh Paints. They developed their Manor Hall® Exterior House series of paints to complement ProWood. 1 ElectroVoice recommends the use of these paints in adverse or tough situations. Water-based latex paints in particular can _____________ 1. [. . . ]