Crest audio LH5M SPECIFICATIONS

SERIES

Features

Description

• 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

The Crest Audio LH

TM

5M 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 LH

TM

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 LH

TM

5M 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 LH

TM

5M is constructed of very high quality 3/4", 7-ply all-poplar
plywood, which is void-free, medium density and warp-resistant. The
LH

TM

5M 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 LH

TM

5M 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.

LHTM5M

Loudspeaker

Full Range

Other LH series loudspeakers

LHTM5M

LHTM1
LHTM2
LH

TM

3
LHTM4
LHTM6M
LH

TM

7M

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

Power Handling Continuous Program Peak

Specifications

LHTM5M Loudspeaker

Power Handling

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 2-

1984. 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.

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.

20 50 100 200 500 1k 2k 5k 10k 20k

Frequency (Hz)

70

80

90

100

110

dB SPL (re 20 Pa)

Amplitude Response (1W 1m On-Axis)

Figure 1

20 50 100 200 500 1k 2k 5k 10k 20k

Frequency (Hz)

1

2

3

5

10

20

30

50

100

Impedance

Z

(

)

Figure 2