User manual PEAVEY DTH 118B DATASHEET

[. . . ] The DTH 118b uses one 18" 1888-8 HP Black Widow® woofer in the compression chamber of the horn. The amount of compression both from the rear of the woofer cone and into the slot-loaded horn throat effectively raises the impedance enough to rate the system at 8 ohms . [. . . ] Utilizing audio band (20 Hz to 20 kHz) pink noise with peaks over four times the RMS level, this strenuous test signal assures the user that every portion of this system can withstand today's hightechnology music. The test signal contains large amounts of very low frequency energy, effectively simulating the frequency content of live music situations. The full measure of high frequencies in the test signal allow for exposure of the speaker system to synthesized tones that may extend beyond audibility. This rating is contingent upon having a minimum 3 dB of amplifier headroom available. FREQUENCY RESPONSE This measurement is useful in determining how accurately a given enclosure reproduces an input signal. The frequency response of the DTH 118b is measured at 1 meter using a 2. 8-volt swept sine input. As shown in Figure 1, the DTH 118b provides a smooth frequency response below 60 Hz and up to the crossover frequency. Low frequencies can be extended downward by using the optional Peavey DTH 118b Sub Processor. The DTH 118b Sub Processor specifically provides all the necessary elements to optimize the performance of the DTH 118b and the earlier DTH 118 folded horn bass cabinets. Subsonic filtering is included, which allows maximum power handling at low frequencies. Moderate Q filtering maximizes the output of the DTH 118b near horn cutoff. Additionally, optimized highpass outputs are provided for the DTH 4000 series speakers. ARCHITECTURAL AND ENGINEERING SPECIFICATIONS The loudspeaker system shall have an operating bandwidth of 58 Hz to 300 Hz. The output level shall be 104 dB when measured at a distance of one meter with an input of one watt. [. . . ] Ear plugs or protectors in the ear canals or over the ears must be worn when operating this amplification system in order to prevent a permanent hearing loss if exposure is in excess of the limits as set forth above. To ensure against potentially dangerous exposure to high sound pressure levels, it is recommended that all persons exposed to equipment capable of producing high sound pressure levels such as this amplification system be protected by hearing protectors while this unit is in operation. ONE YEAR LIMITED WARRANTY NOTE: For details, refer to the warranty statement. [. . . ]