User manual ELECTRO-VOICE TL18-1 EDS

[. . . ] ProWood is made of selectively oriented hardwood strands strongly bonded together within a phenolic resin matrix. The surface is a proprietary vinyl laminate, especially formulated for Electro-Voice, which can be painted or stained to match any decorative environment (see Finishing ProWood section). The TL series is suited for any installation where high-quality sound is required. The weather-resistant finish makes these systems suitable for both indoor and covered outdoor applications including stadiums, auditoriums and churches. [. . . ] If an appropriate low-frequency boost-andcut equalization is applied, the normal f3 of 40 Hz is reduced to 28 Hz. It is suggested that the Electro-Voice XEQ-2 or XEQ-3 active crossover be used to provide the required equalization. The suggested equalization is an underdamped second-order high-pass filter tuned to 29 Hz with a Q of 2. This provides a boost of 6 dB at the tuning frequency and a 12-dB-per-octave roll-off below. This filter is directly available on the XEQ-2 or can be generated in the XEQ-3 by using the optional EB29/35 EQ module. SUBPASSBAND SPEAKER PROTECTION Below the enclosure tuning frequency, cone excursion increases rapidly. Since acoustic output is also falling rapidly, there is no utility in driving the system with signals much below tuning frequency. While such signals may be in the program material, they are often extraneous, such as a dropped microphone. The stepdown equalization described in the Step-Down section provides the required protection. If step-down mode is not used, the Electro-Voice EX-24, XEQ-2 and XEQ-3 electronic crossover/equalizers can also provide subpassband protection. The 3-dB-down points are 30 Hz (EX-24 and XEQ-2) and 16 Hz or 32 Hz (XEQ-3). Other high-pass filters are available and 1/3-octave equalizers can also be effective at providing the required protection. USE IN MULTIPLES TL systems may be stacked for greater acoustic output and a narrower beamwidth. (It is assumed that all cones are operating in unison or in phase. ) At relatively low frequencies, below about 150 Hz for typical TL series dimensions, stacking produces additional acoustic output without altering dispersion. When a common signal is applied, a 6-dB increase in maximum acoustic output occurs. The cones mutually couple and act as one cone with twice the area (therefore twice the efficiency) and twice the power capacity. The additional cone area prov i d e s 3 dB more output and the additional power capacity accounts for the remaining 3 dB. Specifically, mutual coupling occurs at frequencies whose wavelengths are longer than one-quarter the center-to-center distance between the cones. The highest frequency at which mutual coupling occurs is calculated from the following equation: f 3, 000 , DMAX where DMAX (inches) is the distance between the cones, and f (Hz) is the highest frequency at which coupling occurs. 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. [. . . ] 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. [. . . ]