User manual ELECTRO-VOICE TL606DW EDS

[. . . ] However, to extract the maximum performance from the TL606DW, a multiamp configuration using the XEQ-2 or XEQ-3 crossover/equalizer units is recommended so that full rated power may be applied to the lowfrequency system. With a half-power point of 40 Hz, the TL606DW can also serve as the subwoofer component in large, multiway systems. FREQUENCY RESPONSE The TL606DW frequency response was measured in an anechoic environment at 10 feet on axis with swept one-third-octave pink noise. The frequency response curve for the TL606DW are shown in Figure 1. [. . . ] However, high-output subwoofer systems such as the TL606DW should be protected by a high-pass filter with a 3-dBdown corner frequency of about 0. 8 the enclosure tuning frequency. Below the corner frequency, a roll-off of 12-dB-per-octave is usually sufficient. Without protection, subpassband signals may bottom the DL15Ws. Damage will probably result, especially after repeated occurrences. Even if bottoming does not occur, the subpassband signals waste amplifier power and modulate (distort) the frequencies which are within the TL606DWs operating range. Much woofer distortion or muddy bass can be attributed to lack of subpassband protection. The Electro-Voice EX-24, XEQ-2 and XEQ-3 electronic crossover/equalizers 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 onethird-octave equalizers can also be effective at providing the required protection. USE IN MULTIPLES TL606DWs may be used in multiples to increase acoustic output. In the following discus- sion, it is assumed that all speaker cones are operating in unison (in phase) when a common signal is applied. A 6-dB increase in maximum acoustic output results when two speakers are located side by side. For operation at very low frequencies, the woofer cones mutually couple, acting as one speaker with cone area and power-handling capacity twice that of a single speaker. The doubling of cone area doubles efficiency, providing a 3-dB increase in sound pressure level. The second 3 dB comes from the doubling of power capacity. Mutual coupling occurs when the frequency is such that the center-to-center distance between the two speaker cones is less than about one-quarter wavelength. For a given center-tocenter distance, the highest frequency at which mutual coupling will occur can be calculated from the following formula: 3, 000 f = , Dmax where Dmax is the distance in inches and f is frequency in Hz. When Dmax is greater than one-quarter wavelength, as would occur if two TL606DWs were widely spaced, the level increase tends to be limited to the 3-dB power-handling increase. More than two TL606DWs can be used for increased output. In general, maximum acoustic power output ability increases as the square of the number of mutually coupled cones. For example, four cones would provide 42 or 16 times the power output of a single cone, an increase of 12 dB (10 log10 16 = 12 dB). Note that the associated increased efficiency (2. 9% X 4 = 12%) approaches that of a fully horn-loaded design, but in a much smaller enclosure. [. . . ] 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. [. . . ]