User manual CREST AUDIO LH1 LOUDSPEAKER SPECIFICATIONS

[. . . ] LH 1 Loudspeaker TM SERIES Power Handling Full Range Continuous Program Peak LHTM1 LHTM2 LHTM3 LHTM4 LHTM5M LHTM6M LHTM7M 600W 1, 000W 500W 1, 200W 400W 500W 1, 000W 1, 200W 2, 000W 1, 000W 2, 400W 800W 1, 000W 2, 000W 2, 400W 4, 000W 2, 000W 4, 800W 1, 600W 2, 000W 4, 000W Other LH series loudspeakers Features · Smooth frequency response characteristics · 600 Watt continuous rated woofer · 150 Watt continuous rated compression driver · 90 degree x 40 degree constant directivity horn with 2" throat · High power crossover components · Neutrik Speakon® input connectors, with automatic biamp switching · 15 degree trapezoidal cabinet design · Recessed steel handles with comfortable round handgrip · Heavy gauge metal grill with black, powder-coat finish · High-impact resistant polypropylene cabinet corners · 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 LHTM1 is a two-way speaker system comprised of one 15" high power woofer, one 2" exit compression driver coupled to a 90° x 40° constant directivity horn. As with all LHTM full-range speakers, this unit can be driven in full-range or biamp mode simply by plugging into the desired jack on the input plate. The LHTM1 has a trapezoidal shaped cabinet, rather than the more traditional rectangular shape. This allows cabinet arrays to be constructed more easily. This shape also reduces the build-up of internal standing waves. [. . . ] This switch allows a choice between flat (HIGH position) and mildly attenuated (NORMAL position) mid-range frequencies. The position of this switch is purely dependent on venue and personal sonic taste. As a suggestion, the NORMAL position is more suitable for live (highly reflective, long reverb time) venues. Whereas, the HIGH position is more suitable in venues where the reverb time is relatively short. This switch is located on the rear panel input plate and is actuated with a suitable tool such as a flat screwdriver tip, or door key. Specifications Power Handling 110 LH 1 Loudspeaker Amplitude Response (1W 1m On-Axis) dB SPL (re 20 Pa) 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 very 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. 100 90 80 70 20 50 100 200 Figure 1 100 50 30 Z 20 ( ) 10 5 3 2 1 20 500 1k Frequency (Hz) 2k 5k 10k 20k Lower Curve: Midrange Contour = Norm, Upper Curve: Midrange Contour = High Impedance Frequency Response This measurement is useful in determining how accurately a given unit reproduces an input signal. The frequency response of the LH1 (Figure 1) is measured at a distance of 1 meter using a 1 Watt (into the nominal impedance) sweptsine input signal. 50 100 200 Figure 2 360 300 Beamwidth (Degrees) 500 1k Frequency (Hz) 2k 5k 10k 20k Lower Curve: Midrange Contour = High, Upper Curve: Midrange Contour = Norm Beamwidth Directivity Beamwidth is derived from the -6 dB points from the polar plots which are measured in a whole space anechoic environment. Q and Directivity Index (Figures 3 & 4) are plotted for the on-axis measurement position. These are specifications that provide a reference to the coverage characteristics of the unit. These parameters provide insight for proper placement and installation in the chosen environment. 180 140 100 80 60 40 30 20 Horizontal Vertical 50 100 200 500 1k Frequency (Hz) 2k 5k 10k 20k Figure 3 100 Q & Directivity Index 20 Q 10 10 Di 1 20 50 100 200 Figure 4 500 1k Frequency (Hz) 2k 5k 10k 0 20k Specifications Horizontal Polars 0 30 o o LH 1 Loudspeaker TM 0 -30 o o 0 -30 o o 0 -30 o o 30 o 30 o 30 o -30 o 60 o -60 o 60 o -60 o 60 o -60 o 60 o -60 o 90 o -90 o 90 o -90 o 90 o -90 o 90 o -90 o 125 Hertz 250 Hertz 500 Hertz 1000 Hertz 0 30 o o 0 -30 o o 0 -30 o o 0 -30 o o 30 o 30 o 30 o -30 o 60 o -60 o 60 o -60 o 60 o -60 o 60 o -60 o 90 o -90 o 90 o -90 o 90 o -90 o 90 o -90 o 2000 Hertz 4000 Hertz 8000 Hertz 16000 Hertz Vertical Polars 90 o 90 60 o o 90 60 o o 90 60 o o 60 o 30 o 30 o 30 o 30 o 0 o 0 o 0 o 0 o -30 o -30 o -30 o -30 o 125 Hertz -60 -90 o o 250 Hertz -60 -90 o o 500 Hertz -60 -90 o o 1000 Hertz -60 -90 o o 90 o 90 60 o o 90 60 o o 90 60 o o 60 o 30 o 30 o 30 o 30 o 0 o 0 o 0 o 0 o -30 o -30 o -30 o -30 o 2000 Hertz -60 -90 o o 4000 Hertz -60 -90 o o 8000 Hertz -60 -90 o o 16000 Hertz -60 -90 o o Specifications LHTM1 Loudspeaker frequency response usable low frequency limit (-10 dB point) power handling sound pressure level 48 Hz to 20 kHz ±3 dB 35 Hz Full Range Full Range 600 W - 69. 3 V RMS LH 1 Loudspeaker TM 1, 200 W program 2, 400 W peak 300 W program 600 W peak passive high freq 150 W - 34. 6 V RMS high freq107 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 97. 0 dB SPL, (2. 83 V input) 126. 8 dB SPL continuous 132. 8 dB SPL peak 134. 5 dB SPL continuous 140. 5 dB SPL peak 90 degrees horizontal x 40 degrees vertical Low Freq High Freq Fbox Low Freq Low Freq Low Freq High Freq Full Range High Freq 1x 15" Woofer, vented basket 2. 0" Exit / 75 mm voice coil compression driver on a CD horn 44 Hz High Freq - 1600 Hz High Freq - 1600 Hz 0. 00 ms 0. 60 ms Nominal 8. 0 Nominal 8. 0 Minimum - 6. 9 Minimum - 8. 2 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. [. . . ] The outside dimensions shall be 33. 50 inches high by 22. 38 inches wide by 19. 75 inches deep. The loudspeaker system shall be a Crest Audio model LHTM1. Crest Audio reserves the right to make improvements in manufacturing or design which may affect specifications. 8/21/01 v. 1. 5 *80304806* Crest Audio Inc. Fair Lawn, NJ 07410 USA TEL: 201. 909. 8700 FAX: 201. 909. 8744 www. crestaudio. com [. . . ]