User manual ELECTRO-VOICE AR400 DATASHEET
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Manual abstract: user guide ELECTRO-VOICE AR400DATASHEET
Detailed instructions for use are in the User's Guide.
[. . . ] The DH2010A uses a unique, convexdrive Time PathTM phasing plug structure (U. S. Patent #4, 525, 604) for smooth and extended high-frequency performance. The voice coil is coupled to the diaphragm with EV's exclusive Resonant DriveTM technology. This increases and smooths the high-frequency response and reduces the amount of internal equalization required for flat frequency response. [. . . ] The controlled directivity of the high- and low-frequency transducers also eliminates response irregularities caused by diffraction off nearby enclosure edges and, in combination with an essentially flat onaxis frequency response, produces a total acoustic power output that is uniform with frequency. Directivity A unique feature of the Sx300PI is the constant-directivity dispersion provided by the 65° x 65° horn. The polar response of the system at selected one-third-octave band2
Sx300PI and Sx300PIX 300-Watt Two-Way Weather-Resistant Speaker Systems
widths is shown in Figure 2. These polar responses were measured in an anechoic environment at 10 feet using one-third-octave pink-noise inputs. The frequencies selected are fully representative of the polar response of the system. Beamwidth of the system utilizing the complete one-third-octave polar data is shown in Figure 4. Suspending Sx300PI Enclosures WARNING: Suspending any object is potentially dangerous and should only be attempted by individuals who have a thorough knowledge of the techniques and regulations of rigging objects overhead. Electro-Voice strongly recommends that the Sx300PI be suspended taking into account all current national, federal, state and local regulations. It is the responsibility of the installer to ensure the Sx300PI is safely installed in accordance with all such regulations. If the Sx300PI is suspended, Electro-Voice strongly recommends that the system be inspected at least once a year. If any sign of weakness or damage is detected, remedial action should be taken immediately. The instantaneous peaks test mechanical reliability (cone and diaphragm excursion). Note that the sine-wave test signals sometimes used have a much less demanding peak value relative to their average level. In actual use, long-term average levels exist from several seconds on up, but we apply the long-term average for several hours, adding another extra measure of reliability. Specifically, the Sx300PI is designed to withstand the power test described in the ANSI/EIA RS-426-A 1980. To obtain the spectrum, the output of a white-noise generator (white noise is a particular type
Sx300PI and Sx300PIX 300-Watt T wo-Way Weather-Resistant Speaker Systems
of random noise with equal energy per bandwidth in Hz) is fed to a shaping filter with 6-dB-per-octave slopes below 40 Hz and above 318 Hz. When measured with the usual constant-percentage bandwidth analyzer (one-third-octave), this shaping 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 sent to the power amplifier with the continuous power set at 300 watts into the 7. 1-ohm EIA equivalent impedance (46. 2 volts true rms). Amplifier clipping sets instantaneous peaks at 6 dB above the continuous power, or 1, 200-watts peak (92. 5 volts peak). This procedure provides a rigorous test of both thermal and mechanical failure modes. Amplifier Power Recommendations As noted in the Power-Handling Capacity section above, the Sx300PI has a randomnoise power capacity of 300-watts long term (1, 200-watts peak) (nontransformer) per ANSI/EIA RS-426-A 1980. The following guidelines will help relate this number to an appropriate power amplifier output rating. [. . . ] A list of authorized service representatives is available from Electro-Voice Service at 600 Cecil Street, Buchanan, MI 49107 (800/234-6831 or FAX 616/695-4743). Incidental and Consequential Damages Excluded: Product repair or replacement and return to the customer are the only remedies provided to the customer. Electro-Voice shall not be liable for any incidental or consequential damages including, without limitation, injury to persons or property or loss of use. Some states do not allow the exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you. [. . . ]
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