Full Range
Other LH series loudspeakers
S E R I E S
Features
Description
• 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
• Exterior grade 3/4", 7-ply all poplar APA-1 plywood
• Scuff and weather resistant, black Hammer-Head™ finish
The Crest Audio LH
TM
2 is a newly designed non-traditional, three-way speaker
system comprised of one 15" high power woofer, one 15" high power mid-
woofer, and a 2" exit compression driver coupled to a 90° x 40° constant direc-
tivity horn.The crossover in the LH2 is unique in that it allows both 15" woofers
to be operating in parallel below 300 Hertz. The mid-range is covered by the
upper 15" woofer up to the crossover of 1,700 Hertz to the compression driver.
As with all LH
TM
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
LH
TM
2 has a trapezoidal shaped cabinet, rather than the more traditional rec-
tangular shape.This allows cabinet arrays to be constructed more easily.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 square dimensions of the cabi-
net. The trapezoidal shape resists the formation of standing waves by caus-
ing the internal reflections to cancel rather than reinforce each other. This
ensures a minimum of mid-bass and mid-range coloration of the reproduced
sound due to standing waves within the cabinet.
The LH
TM
2 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
2 cabinet is fin-
ished with Crest Audio’s durable black Hammer-Head™ poly-coating. Polymer
corners are also added to provide further protection to the cabinet.A black, pow-
der-coated, heavy-gauge metal grill covers the lower section of the front of the
cabinet to protect the low and mid frequency 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 protec-
tion circuit in both full-range and bi-amp modes of operation. When the high
frequency drive level to the LH
TM
2 exceeds predetermined thresholds, the
protection circuit is temporarily engaged. This subtly decreases the signal
level applied to the high frequency driver so that they will not be damaged due
to long term overpowering. Short duration transients will not be attenuated by
the protection circuit and thus have the potential to damage the drivers. The
protection circuit is realized through the use of a dynamically resistive com-
ponent in conjunction with a switched padding circuit.
An additional feature in the crossover circuitry is a mid-range contour switch.
This switch allows a choice between flat (HIGH position) and mildly attenuat-
ed (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.
LH
TM
2
Loudspeaker
LH
TM
2
LH
TM
1
LH
TM
3
LH
TM
4
LH
TM
5M
LH
TM
6M
LH
TM
7M
1,000W
600W
500W
1,200W
400W
500W
1,000W
2,000W
1,200W
1,000W
2,400W
800W
1,000W
2,000W
4,000W
2,400W
2,000W
4,800W
1,600W
2,000W
4,000W
Power Handling
Continuous
Program
Peak
