User manual ELECTRO-VOICE B-1150M DATASHEET

[. . . ] These circuits will automatically reduce the power being delivered to the drivers if their threshold is exceeded, greatly reducing the possibility of driver failure. Both drivers feature low-flux-leakage designs enabling the speaker to be used in close proximity to video monitors. For very critical video monitoring applications, a minimum distance of four inches from the edge of the loudspeaker to the edge of the CRT is recommended. Frequency Response The combination of 5·-in. [. . . ] First, we use a random noise input signal because it contains many frequencies simultaneously, just like real voice or instrument program. Second, our signal contains more energy at extremely high and S-40 Compact Monitor low frequencies than typical actual program, adding an extra measure of reliability. Third, the test signal includes not only the overall "long-term average" or "continuous" level which our ears interpret as loudness - but also short- duration peaks which are many times higher than the average, just like the actual program. The long-term average level stresses the speaker thermally (heat). 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 S-40 is designed to withstand the power test described in the revised EIA Standard RS-426A. The EIA test spectrum is applied for eight hours. To obtain the spectrum, the output of a white noise generator (white noise is a particular type of random noise with equal energy per bandwidth in Hz) is fed to a shaping filter with 6dB-per octave slopes below 40 Hz and above 318 Hz. When measured with the usual constant-percentage bandwidth analyzer (onethird octave), this shaping filter produces a spectrum whose 3-dB-down points are at 100 Hz and 1200 Hz with a 3-dB-per octave slope above 1200 Hz. If the speaker is to be placed on its side, then a rubber foot should be attached to each of the four corners. The nameplate that is attached to the grille may be rotated depending on which mounting orientation is used. Architects' and Engineers' Specifications The loudspeaker shall be a two-way system consisting of a 13 cm (5·-in. ) low-frequency loudspeaker, 2. 5 cm (1 inch) high-frequency loudspeaker and frequency dividing network installed in a vented enclosure. The dividing network crossover frequency shall be 3, 500 Hz. The dividing network shall include protection circuits for both the lowfrequency loudspeaker and the high-frequency loudspeaker. The loudspeaker system shall meet the following performance criteria: Power handling, 160 watts per EIA RS-426A. Pressure sensitivity, 85 dB SPL at one watt, 100 Hz to 10 kHz measured at a distance of one meter on axis. Impedance, 4 ohms nominal, 3. 7 ohms minimum. The enclosure shall be molded of high impact polystyrene structural foam. The unit shall be 24. 9 cm (9. 8 inch) high, 17. 8 cm (7. 0 inch) wide, 15. 0 cm (5. 9 inch) deep. The loudspeaker system shall be the ElectroVoice model S-40. [. . . ] 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. The Limited Warranty does not apply to burned voice coils or malfunctions such as cone and/or coil damage resulting from improperly designed enclosures. [. . . ]