LH 5M
Loudspeaker
TM
Power Handling
SERIES
Continuous
Program
Peak
400W
800W
1,600W
1,200W
2,000W
1,000W
2,400W
1,000W
2,000W
2,400W
4,000W
2,000W
4,800W
2,000W
4,000W
Full Range
LHTM5M
Other LH series loudspeakers
LHTM1
LHTM2
LHTM3
LHTM4
LHTM6M
LHTM7M
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-Head™ finish
600W
1,000W
500W
1,200W
500W
1,000W
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. This shape also greatly reduces the
build-up of internal standing waves. Standing waves are internal
amplitude peaks that occur due to reflections within the cabinet at frequencies related to the internal dimensions of the cabinet. This
ensures a minimum of mid-bass and mid-range coloration of the
reproduced sound due to standing waves within the cabinet.
Additionally, a stand mount adapter is included for easy side-fill applications.
The LHTM5M is constructed of very high quality 3/4", 7-ply all-poplar
plywood, which is void-free, medium density and warp-resistant. The
LHTM5M cabinet is finished with Crest Audio’s durable black HammerHead poly-coating. Polymer corners are also included to provide further protection to the cabinet. A black, powder-coated, heavy-gauge
metal grill covers the entire front of the monitor to protect the drivers
from unforeseen impacts.
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
TM
LH 5M Loudspeaker
Power Handling
Amplitude Response (1W 1m On-Axis)
110
dB SPL (re 20 Pa)
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.
100
90
80
70
20
50
100
200
Figure 1
500
1k
Frequency (Hz)
2k
5k
10k
20k
2k
5k
10k
20k
Impedance
100
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.
50
30
Z 20
( ) 10
5
3
2
1
20
Figure 2
50
100
200
500
1k
Frequency (Hz)
Specifications
TM
LH 5M Loudspeaker
LHTM5M Loudspeaker
frequency response
usable low frequency limit (-10 dB point)
58 Hz to 18 kHz ±3 dB
45 Hz
power handling
Full Range
sound pressure level
400 W - 56.6 V RMS
800 W program
1,600 W peak
passive high freq 150 W - 34.6 V RMS
300 W program
600 W peak
Full Range
96.0 dB SPL, (2.83 V input)
high freq106 dB SPL, (2.83 V input)
maximum sound pressure level (1 meter)
radiation angle measured
transducer complement
box tuning frequency
Full Range
125.2 dB SPL continuous 131.2 dB SPL peak
High Freq
127.5 dB SPL continuous 133.5 dB SPL peak
90 degrees horizontal x 60 degrees vertical
Low Freq
1x 12" woofer, vented basket
High Freq
1.0" Exit / 44 mm voice coil compression driver on a CD horn
Fbox
55 Hz
crossover frequency (internal passive)
Low Freq
High Freq - 2,000 Hz
recommended minimum active crossover
Low Freq
High Freq - 1,200 Hz @ 12 dB/octave
time offset
Low Freq
0.00 ms
High Freq
0.00 ms
Full Range
Nominal 8.0Ω
Minimum - 7.3Ω
High Freq
Nominal 8.0Ω
Minimum - 10Ω
impedance Z
2x Neutrik Speakon
input connections
4 conductor input jacks
1x Neutrik Speakon 4
conductor biamp switching input jack
enclosure materials and finish
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.
dimensions (H x W x D)
net weight
Architects’ & Engineers’ Specifications:
The loudspeaker system shall have an operating bandwidth of 58 Hz to 18 kHz. The nominal output level shall be 96.0 dB when measured at a distance of one meter with an input
of one Watt. The nominal impedance shall be
8.0 Ohms. The maximum continuous power
front
27.0” x 16.0” x 15.5”
686 mm x 406 mm x 394 mm
rear
27.0” x 16.0” x 15.5”
686 mm x 406 mm x 394 mm
60 Lbs. (27.3 kg)
handling shall be 400 Watts, maximum program power of 800 Watts and a peak power
input of at least 1,600 Watts, with a minimum
amplifier headroom of 3 dB.
The nominal radiation geometry shall be 90
degrees in the horizontal plane and 60 degrees
in the vertical plane. The outside dimensions
shall be 27.0 inches high by 16.0 inches wide by
15.5 inches deep. The weight shall be 60
pounds. 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.
16-00 Pollitt Dr. Fair Lawn, NJ 07410
TEL: 201.909.8700 FAX: 201.909.8744
www.crestaudio.com