User manual ELECTRO-VOICE DC30B
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Manual abstract: user guide ELECTRO-VOICE DC30B
Detailed instructions for use are in the User's Guide.
[. . . ] There is much less coloration of the sound from resonating sources, leaving only the intended sound to be heard by the audience. Installation 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 items overhead. Electro-Voice strongly recommends that the MH4020AC be suspended in accordance with all current national, federal, state and local regulations. It is the responsibility of the installer to ensure that the MH4020AC is safely installed in accordance with all such regulations. [. . . ] Equalization and Subpassband Protection The MH4020AC's mid-bass section exhibits typical constant-directivity horn characteristics, i. e. , roll-off at the frequency extremes. At higher frequencies, the roll-off approximately matches the power-response of the DL10X-SH (6 dB per octave). At lower frequencies, directivity is lost when the mouth is no longer large enough to maintain directional control. These two consequences can be observed in the "humped" response in Figure 3. Equalization can be easily applied with a graphic equalizer to give a flat response. The high-frequency compression driver can be equalized with a graphic equalizer or an EQ module inserted into the Electro-Voice XEQ-2 (two-way) or XEQ-3 (two-way or three-way) active crossover/equalizer. The EQ module should be selected to suit the particular compression driver and the HP420A horn (see relevant data sheet). Because of its use in large arenas, where air loss can be significant, it is recommended that the system be equalized "on site" for optimum results. The XEQ-3 and the mid-bass EQ module from the EQMT-2 can be used to provide a good starting point for the equalization.
Electro-Voice strongly recommends the use of a 100-Hz high-pass filter to protect the drivers from unnecessary excursion and thermal stress. Connections The four DL10X-SH drivers in the MH4020AC horn have a nominal impedance of 16 ohms each and can be accessed individually and driven independently. It is particularly important to bear in mind the impedance of any cabling and specifications of the amplifier before selecting a specific combination. The high-frequency section's power handling is dependent on the selected driver combination. Architects' and Engineers' Specifications The horn shall be of the constant-directivity type. It shall produce a horizontal beamwidth (6-dB-down angle) of 40°, deviating no more than +20°/5° from this angle over the range of 350 Hz to 20 kHz. It shall produce a vertical beamwidth of 20°, deviating no more than +30°/5°over the frequency range of 350 Hz to 20 kHz. The MH4020AC mid-bass section shall operate over the range of 100 Hz to 4, 000 Hz, with a recommended crossover frequency of 1, 600 Hz, and be driven by four 10-inch, weather-resistant drivers with high-technology cones of Kevlar® and epoxy. 1 The patented Manifold Technology® technique shall be exploited and result in a power-handling capacity of 1, 200 watts per EIA Standard RS426A. The average axial sensitivity shall be 109 dB SPL at 1 meter with 2. 83 volts applied. The frequencies above 1, 600 Hz shall be produced by the supplied Electro-Voice HP420A TransPlanarTM constant-directivity horn with user-selectable driver combinations. The horn bell manifold chamber and back covers shall be constructed of fiberglass, foam and polyester resin. Two steel mounting rails shall be provided to coaxially mount the Electro-Voice HP420A horn. The horn shall have an integral rear mounting bracket made of black powder-coated 10-gauge steel. Brackets shall be provided at the front of the horn to stabilize and aim the MH4020AC. [. . . ] 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. Other Rights: This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Electro-Voice Speakers and Speaker Systems are guaranteed against malfunction due to defects in materials or workmanship for a period of five (5) years from the date of original purchase. [. . . ]
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