User manual CREST AUDIO LH5M LOUDSPEAKER SPECIFICATIONS

[. . . ] LH 5M Loudspeaker TM SERIES Power Handling Full Range Continuous Program Peak LHTM5M LHTM1 LHTM2 LHTM3 LHTM4 LHTM6M LHTM7M 400W 600W 1, 000W 500W 1, 200W 500W 1, 000W 800W 1, 200W 2, 000W 1, 000W 2, 400W 1, 000W 2, 000W 1, 600W 2, 400W 4, 000W 2, 000W 4, 800W 2, 000W 4, 000W Other LH series loudspeakers Features · Smooth frequency response characteristics · 400 Watt continuous rated woofer · 150 Watt continuous rated compression driver · 90 degree x 60 degree constant directivity horn with 1" throat · High power crossover components · Neutrik Speakon® input connectors, with automatic biamp switching · Dual-angle cabinet design · Recessed steel handles with comfortable round handgrip · Stand adapter for side-fill use · Heavy gauge metal grill with black, powder-coat finish · Rugged stand adapter · Exterior grade 3/4", 7-ply all poplar APA-1 plywood · Scuff and weather resistant, black Hammer-HeadTM finish Description The Crest Audio LHTM5M is a newly designed, two-way stage monitor comprised of one 12" high power woofer, one 1" exit compression driver coupled to a 90° x 60° constant directivity horn. As with all LHTM full-range speakers, this unit can be driven in fullrange or biamp mode simply by plugging into the desired jack on the input plate. The LHTM5M cabinet has a dual-angle back for use in long and short throw applications. [. . . ] Crest Audio's protection circuit for mid and high frequency driver protection is included as a standard feature. The input signal is routed through the protection circuit in both full-range and bi-amp modes of operation. When the high frequency drive level to the LHTM5M exceeds predetermined thresholds, the protection circuit is temporarily engaged. This subtly decreases the signal level applied to the high frequency driver so that it will not be damaged due to long-term overpowering. High amplitude, short duration transients will not be attenuated by the protection circuit and thus have the potential to damage the driver. The protection circuit is realized through the use of a dynamically resistive component in conjunction with a switched padding circuit. Specifications Power Handling LH 5M Loudspeaker Amplitude Response (1W 1m On-Axis) TM There are many different approaches to power handling ratings. Crest Audio rates this unit's system power handling using a modified form of the AES Standard 21984. Utilizing audio band limited (20 Hz 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 high inpact music. The test signal contains large amounts of low frequency energy, effectively simulating the frequency content of live music situations. High frequency test signals expose the speaker system to synthesized tones that may extend beyond audibility. This rating is contingent on having a minimum of 3 dB of amplifier headroom available so as to ensure that clipping does not occur. 110 dB SPL (re 20 Pa) 100 90 80 70 20 50 100 200 Figure 1 500 1k Frequency (Hz) 2k 5k 10k 20k Impedance 100 50 30 Z 20 ( ) 10 5 3 2 1 20 50 100 200 500 1k Frequency (Hz) 2k 5k 10k 20k Frequency Response This measurement is useful in determining how accurately a given unit reproduces an input signal. The frequency response of the LH 5M (Figure 1) is measured at a distance of 1 meter using a 1 Watt (into the nominal impedance) sweptsine input signal. Figure 2 Specifications LHTM5M Loudspeaker frequency response usable low frequency limit (-10 dB point) power handling sound pressure level 58 Hz to 18 kHz ±3 dB 45 Hz Full Range Full Range 400 W - 56. 6 V RMS LH 5M Loudspeaker TM 800 W program 300 W program 1, 600 W peak 600 W peak passive high freq 150 W - 34. 6 V RMS high freq106 dB SPL, (2. 83 V input) maximum sound pressure level (1 meter) radiation angle measured transducer complement box tuning frequency crossover frequency (internal passive) recommended minimum active crossover time offset impedance Z Full Range High Freq 96. 0 dB SPL, (2. 83 V input) 125. 2 dB SPL continuous 131. 2 dB SPL peak 127. 5 dB SPL continuous 133. 5 dB SPL peak 90 degrees horizontal x 60 degrees vertical Low Freq High Freq Fbox 55 Hz High Freq - 2, 000 Hz High Freq - 1, 200 Hz @ 12 dB/octave 0. 00 ms 0. 00 ms Nominal 8. 0 Nominal 8. 0 Minimum - 7. 3 Minimum - 10 Low Freq Low Freq Low Freq High Freq Full Range High Freq 1x 12" woofer, vented basket 1. 0" Exit / 44 mm voice coil compression driver on a CD horn 2x Neutrik Speakon input connections 4 conductor input jacks 1x Neutrik Speakon 4 conductor biamp switching input jack enclosure materials and finish dimensions (H x W x D) net weight 3/4", 7-ply premium, exterior grade, all-poplar, void-free plywood. Material conforms to APA-1 specification. Finished in black, Hammer-Head poly-coating. [. . . ] The outside dimensions shall be 27. 0 inches high by 16. 0 inches wide by 15. 5 inches deep. The loudspeaker system shall be a Crest Audio model LHTM5M. Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications. 8/22/01 v. 1. 5 *80304810* Crest Audio Inc. Fair Lawn, NJ 07410 TEL: 201. 909. 8700 FAX: 201. 909. 8744 www. crestaudio. com [. . . ]