Electro voice sentry 100 a owners manual
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Sentry® 100A Professional Monitor System Sentry® 100A Professional Monitor System 2 SpeakerPlacement For Good Stereo Imaging Results of testing by Electro-Voice and oth- ers, such as Juhani Borenious 2, suggest a rec- ommended listening angle y of 60° ±10° for an optimum stereo image. Rather than mea- sure an imaginary angle, exact positioning can be obtained by placing the speakers so that the ratio of distances h/b = 0.9 ±0.2. The stereo image that results is further reinforced by the uniform dispersant characteristics of the Sentry 100A, particularly in the higher frequency range, where the majority of ste- reo information lies. Off-axis degradation of frequency response cannot be corrected by supplementary equalization. It is therefore critically necessary to use a speaker system with uniform directivity as well as smooth on-axis response. Power Handling Capacity Power handling specifications are usually meaningless because they fail to indicate the nature of the test signal and/or how this test signal relates to actual use. The 30-watt specification for the Sentry 100A is based on filtered random noise (FM interstation noise and tape hiss are common forms of random noise), which is fed to the speaker for an extended time (more than 15 hours). Random noise testing is used because, like real music and speech program material, it contains many frequencies at once. Low fre- quencies, which cause large excursions of the woofer suspension, are present; and mid bass frequencies, which contribute mainly to woofer voice-coil heating, are present as well. Thus the woofer is simultaneously tested for mechanical fatigue and voice-coil overheating. Similarly, the tweeter is tested for both mechanical and thermal failure at appropriate power levels. There is no generally accepted standard for testing loudspeakers for power capacity. At Electro-Voice, we expect each speaker and system to survive 15 hours continuous ap- plication of rated power without failure of any component or permanent change in per- formance. One noise test standard, the West German D.I.N. 45573, specifies the random noisespectrum. This spectrum agrees approxi- mately with studies of voice and music spec- tra that appear in several textbooks on acous- tics. 3,4 However, only a very small percent- age of the power applied to a Sentry 100A would be in the range of the tweeter using this spectrum. A study done by John P. Overley of Electro- Voice 5 resulted in the more realistic spec- trum. The curve shows the relative levels in oc- tave bands of average peak energy found in many musical passages of a symphony or- chestra. Based upon peaks as short as a frac- tion of a second in duration . . . it represents the approximate distribution of energy vs. frequency under highest signal conditions . . . exactly those conditions which should de- termine the power handling requirements of audio components. 6 The musical passages were taken from disc recordings that were played back on carefully equalized high quality transcription equipment. 7 The test signal actually used in developmen- tal testing of the Sentry 100A is shown in Figure 9. It is an approximation to measured spectra of the output of a lead guitar ampli- fier driven into heavy clipping, and repre- sents a worst-cast situation. The Sentry 100A will survive 30 watts of this input for at least 15 hours. The power-handling specification applies to long-term application of power; for short du- ration peaks, the loudspeaker system is ca- pable of handling many times the rated power. For example: for a few milliseconds, the system will handle 10 dB peaks; if the average input power level were 30 watts, then it would handle peak power inputs on the order of 300 watts. Crossover Network The integral crossover network is a 12-dB/ octave dual-section type, crossover occur- ring at 2,000 Hz. In addition, the Sentry 100A has a continuously variable, shelf-type high- frequency control which allows adjustmentfor individual listening preferences, with both boost and cut capability (+2 dB to –4 dB from nominally flat). The high-frequency control is conveniently located on the front panel for easy access. SRB-7Rack Wall Mount Kit One of the fundamental design requirements for the Sentry 100A provided for the ability to install the system in standard EIA 19 in. racks. The hardware needed for this proce- dure is available as an optional kit. This same kit provides for flush and angle wall-mount- ing as well. (Refer to the SRB-7 engineer- ing data sheet for complete details.) A second nameplate, which can be applied over the original label, has been included for those situations where mounting the Sen- try 100A in an inverted position is preferred (woofer nearer to ceiling). warning: Never mount the Sentry 100A by the back panel or by only one of the other panels. Failing to comply with this will cause the panel to separate, resulting in the speaker falling. For the safest method of mounting the Sentry 100A, Electro-Voice strongly sug- gests using the Model SRB-7 rack/wall mounting kit. ______________________ 5. John P. Overley, Energy Distribution in Music, IRE Transactions of Audio, Vol. AU-4, No. 5, Sept.-Oct. (1956). 6. Ibid. p. 121. 7. Ibid. p. 121. ____________________ 2. Juhani Boreniou, On Loudspeaker Response in Sound Control Rooms, J. Audio Engineering Society, preprint (1980). 3. H.F. Olson, PhD., Acoustical Engineering, D. Van Nostrand Company, Inc., Princeton, New Jersey, p. 588 (1957). 4. L. Beranek, Acoustics, McGraw-Hill Book Company, New York, p. 338 (1954).
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Sentry® 100A Professional Monitor System Sentry® 100A Professional Monitor System 3 Limited Warranty Electro-Voice products are guaranteed against malfunction due to defects in mate- rials or workmanship for a specified period, as noted in the individual product-line statement(s) below, or in the individual prod- uct data sheet or owners manual, beginning with the date of original purchase. If such malfunction occurs during the specified pe- riod, the product will be repaired or replaced (at our option) without charge. The product will be returned to the customer prepaid. Ex- clusions and Limitations: The Limited Warranty does not apply to: (a) exterior fin- ish or appearance; (b) certain specific items described in the individual product-line statement(s) below, or in the individual prod- uct data sheet or owners manual; (c) mal- function resulting from use or operation of the product other than as specified in the product data sheet or owners manual; (d) malfunction resulting from misuse or abuse of the product; or (e) malfunction occurring at any time after repairs have been made to the product by anyone other than Electro- Voice Service or any of its authorized ser- vice representatives. Obtaining Warranty Service: To obtain warranty service, a cus- tomer must deliver the product, prepaid, to Electro-Voice Service or any of its autho- rized service representatives together with proof of purchase of the product in the form of a bill of sale or receipted invoice. A list of authorized service representatives is avail- able from Electro-Voice Service at 600 Cecil Street, Buchanan, MI 49107 (800/234-6831 or FAX 616/695-4743). Incidental and Consequential Damages Excluded: Prod- uct repair or replacement and return to the customer are the only remedies provided to the customer. Electro-Voice shall not be li- able for any incidental or consequential dam- ages including, without limitation, injury to persons or property or loss of use. Some states do not allow the exclusion or limita- tion 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 againstmalfunction due to defects in materials or workmanship for a period of five (5) years from the date of original purchase. The Lim- ited Warranty does not apply to burned voice coils or malfunctions such as cone and/or coil damage resulting from improperly designed enclosures. Electro-Voice active electronics associated with the speaker systems are guar- anteed for three (3) years from the date of original purchase. Additional details are in- cluded in the Uniform Limited Warranty statement. For warranty repair or service informa- tion, contact the service repair department at: 616/695-6831 or 800/685-2606. For technical assistance, contact Technical Support at 800/234-6831 or 616/695-6831, M-F, 8:00 a.m. to 5:00 p.m. Eastern Stan- dard Time. Specifications subject to change without notice.