Crest Audio LQ10P LOUDSPEAKER - S User manual

LQ 10P
BIAMPED POWERED SPEAKER
User Manual

2
Intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s
enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons.
Intended to alert the user of the presence of important operating and maintenance (servicing)
instructions in the literature accompanying the product.
CAUTION: Risk of electrical shock — DO NOT OPEN!
CAUTION: To reduce the risk of electric shock, do not remove cover. No user serviceable parts inside. Refer
servicing to qualified service personnel.
WARNING: To prevent electrical shock or fire hazard, do not expose this appliance to rain or moisture. Before
using this appliance, read the operating guide for further warnings.
Este símbolo tiene el propósito, de alertar al usuario de la presencia de “(voltaje) peligroso” sin ais-
lamiento dentro de la caja del producto y que puede tener una magnitud suficiente como para constituir
riesgo de descarga eléctrica.
Este símbolo tiene el propósito de alertar al usario de la presencia de instruccones importantes sobre la
operación y mantenimiento en la información que viene con el producto.
PRECAUCION: Riesgo de descarga eléctrica ¡NO ABRIR!
PRECAUCION: Para disminuír el riesgo de descarga eléctrica, no abra la cubierta. No hay piezas útiles dentro.
Deje todo mantenimiento en manos del personal técnico cualificado.
ADVERTENCIA: Para evitar descargas eléctricas o peligro de incendio, no deje expuesto a la lluvia o humedad
este aparato Antes de usar este aparato, Iea más advertencias en la guía de operación.
Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur la présence d’une tension dangereuse
pouvant être d’amplitude suffisante pour constituer un risque de choc électrique.
Ce symbole est utilisé dans ce manuel pour indiquer à l’utilisateur qu’il ou qu’elle trouvera d’importantes
instructions concernant l’utilisation et l’entretien de l’appareil dans le paragraphe signalé.
ATTENTION: Risques de choc électrique — NE PAS OUVRIR!
ATTENTION: Afin de réduire le risque de choc électrique, ne pas enlever le couvercle. Il ne se trouve à l’intérieur
aucune pièce pouvant être reparée par l’utilisateur. Confiez I’entretien et la réparation de l’appareil à un réparateur
Crest Audio agréé.
AVERTISSEMENT: Afin de prévenir les risques de décharge électrique ou de feu, n’exposez pas cet appareil à la
pluie ou à l’humidité. Avant d’utiliser cet appareil, lisez attentivement les avertissements supplémentaires de ce
manuel.
Dieses Symbol soll den Anwender vor unisolierten gefährlichen Spannungen innerhalb des Gehäuses
warnen, die von Ausreichender Stärke sind, um einen elektrischen Schlag verursachen zu können.
Dieses Symbol soll den Benutzer auf wichtige Instruktionen in der Bedienungsanleitung aufmerksam
machen, die Handhabung und Wartung des Produkts betreffen.
VORSICHT: Risiko — Elektrischer Schlag! Nicht öffnen!
VORSICHT: Um das Risiko eines elektrischen Schlages zu vermeiden, nicht die Abdeckung enfernen. Es befinden
sich keine Teile darin, die vom Anwender repariert werden könnten. Reparaturen nur von qualifiziertem
Fachpersonal durchführen lassen.
ACHTUNG: Um einen elektrischen Schlag oder Feuergefahr zu vermeiden, sollte dieses Gerät nicht dem Regen
oder Feuchtigkeit ausgesetzt werden. Vor Inbetriebnahme unbedingt die Bedienungsanleitung lesen.

3
IIMMPPOORRTTAANNTT SSAAFFEETTYY IINNSSTTRRUUCCTTIIOONNSS
WWAARRNNIINNGG::When using electrical products basic cautions should always be followed including the following:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with a dry cloth.
7. Do not block any of the ventilation openings. Install in accordance with manufacturer’s instructions.
8. Do not install near any heat sources such as radiators heat registers stoves or other apparatus (including amplifiers)
that produce heat.
9. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one
wider than the other. A grounding type plug has two blades and a third grounding plug. The wide blade or third prong is
provided for your safety. If the provided plug does not fit into your outlet consult an electrician for replacement of the
obsolete outlet.
10. Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point
they exit from the apparatus.
11. Note for UK only: If the colors of the wires in the mains lead of this unit do not correspond with the terminals in your
plug‚ proceed as follows:
a) The wire that is colored green and yellow must be connected to the terminal that is marked by the letter E‚ the earth
symbol‚ colored green or colored green and yellow.
b) The wire that is colored blue must be connected to the terminal that is marked with the letter N or the color black.
c) The wire that is colored brown must be connected to the terminal that is marked with the letter L or the color red.
12. Only use attachments/accessories provided by the manufacturer.
13. Use only with a cart stand tripod bracket or table specified by the manufacturer or sold with the apparatus. When a
cart is used use caution when moving the cart/apparatus combination to avoid injury from tip-over.
14. Unplug this apparatus during lightning storms or when unused for long periods of time.
15. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any
way such as power-supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus
the apparatus has been exposed to rain or moisture does not operate normally or has been dropped.
16. Never break off the ground pin. Write for our free booklet “Shock Hazard and Grounding.” Connect only to a power
supply of the type marked on the unit adjacent to the power supply cord.
17. If this product is to be mounted in an equipment rack rear support should be provided.
18. Exposure to extremely high noise levels may cause a permanent hearing loss. Individuals vary considerably in suscep-
tibility to noise-induced hearing loss but nearly everyone will lose some hearing if exposed to sufficiently intense noise
for a sufficient time. The U.S. Government’s Occupational Safety and Health Administration (OSHA) has specified the
following permissible noise level exposures:
Duration Per Day In Hours Sound Level dBA Slow Response
890
692
495
397
2100
1
1
⁄ 2 102
1105
1
⁄
2 110
1
⁄ 4 or less 115
According to OSHA any exposure in excess of the above permissible limits could result in some hearing loss. Ear plugs or protectors to the
ear canals or over the ears must be worn when operating this amplification system in order to prevent a permanent hearing loss if exposure
is in excess of the limits as set forth above. To ensure against potentially dangerous exposure to high sound pressure levels it is
recommended that all persons exposed to equipment capable of producing high sound pressure levels such as this amplification system be
protected by hearing protectors while this unit is in operation.
SSAAVVEE TTHHEESSEE IINNSSTTRRUUCCTTIIOONNSS!!

INTRODUCTION
The Crest LQ™10P features a biamped power section that provides
200 Watts peak dynamic power for the woofer and 70 Watts peak dynamic
power for the compression driver tweeter, both with power amplifier
compression. Offering a 10" premium long-throw woofer and the Crest
HF™-1 compression driver, the LQ 10P provides line-level balanced inputs
with volume control and loop-thru jacks.
Features • Bi-amplified powered system with 200 Watts total power!
• Both power amps have clipping prevention compression
• 10" premium heavy-duty, long throw woofer
• HF-1 2" Titanium compression driver
• Peak SPL in excess of 120 dB with music!
• 1/4" TRS and M/F XLR line-level balanced inputs
• Quadratic Throat Geometry horn has exceptionally smooth response and
precise pattern control
• Link out/in jacks allow linkage with second unit
• Top handgrip
4
ENGLISH

PANEL FEATURES
Rear Panel Features
((11))FFUUSSEE
The unit is AC power line fuse-protected from overloads and
fault conditions with an ABC-type, fast-blow 5 Amp fuse. In the
rare event of a fuse blowout, first make sure the unit is unplugged
and the power switch is in the OFF position, then replace the
blown fuse with a fast-blow, 5 Amp, 250 Volt AC-rated fuse ONLY.
Be sure to fully seat and close the replacement fuse and fuse
holder cap. Reconnect the unit to the AC power line, and with
the volume turned completely down (fully counterclockwise),
turn on the power switch. If the unit blows the fresh fuse, DO
NOT continue to replace fuses, but have the unit checked by a
qualified service technician.
((22))IIEECCPPOOWWEERRCCOORRDDCCOONNNNEECCTTIIOONN
The removable AC power cord plugs into this socket to supply
AC line voltage to the power switch.
((33))OONN--OOFFFFSSWWIITTCCHH
This switch supplies AC power to the system electronics when
switched to the ON position.
5
221133

PANEL FEATURES
Front Panel Features
((44))PPOOWWEERRLLEEDD
Illuminates when the preamp electronics receive power and
should illuminate when the On-Off Switch is in the ON position
and the AC power cord is connected and plugged into the wall
outlet.
((55))LLIINNEEIINN//TTHHRRUU
The input and output jacks are paralleled to allow the audio input
signal to be daisy-chained to other devices.The “output” level is
the same as the “input” level and there is no isolation between
the various jacks.The input is medium impedance balanced. Jack
(5a) is a combo female XLR and 1/4" RTS connector, and jack (5b)
is a male XLR.
((66))LLEEVVEELL
Controls the gain of the LQ10P system.When used with the Line
In/Thru jacks (5), it directly sets the system output level.
((77))LLIINNKKJJAACCKKSS
Link Out takes the signal after the balanced inputs and the level
control and allows linkage to another LQ 10P via its Link In jack.
The level control on the first powered speaker now controls the
level of the linked powered speaker.These are unbalanced high-Z
jacks, so do not run the cable very far.
5544
66
77
6

Operating Instructions
CCAAUUTTIIOONNSS
The unit must be disconnected from the AC power source before any work is done on it.
Refer all servicing to qualified service personnel.
The heat sink on the back plate can become hot to the touch. Do not block or cover the
heat sink from ventilation.
DO NOT connect the inputs of the LQ10P to the output of a power amplifier; the inputs are
meant to be driven from a line level strength signal.
DO NOT remove the protective metal grille.
DO NOT use the INPUT/OUTPUT jacks as mixers by trying to run more than one signal
source at a time into them.The INPUT/OUTPUT jacks (5) are all hard-wired together to
allow use of any of the connector types as an input and to allow a further send or “daisy-
chaining” of the input signal to some other audio device (such as another LQ 10P).
Attempting to run two different signals directly into the LQ 10P could damage the outputs of
the source units. Use a mixer to combine two or more signals into a single signal sent to the
LQ 10P input.
WWAARRNNIINNGG::The LQ 10P is extremely efficient and powerful! This sound system can
permanently damage hearing! Use extreme care setting the overall maximum loudness.
The apparent sound level of the LQ 10P can be deceiving due to its clear, clean sound output.
The lack of distortion or obvious distress can make the sound level seem much lower than it
actually is.This system is capable of SPLs in excess of 120 dB at 1 meter from the speaker!
7

USE OF THE LQ™1 P
FFLLYYIINNGGTTHHEELLQQ1100PP
CCaauuttiioonn::Suspending or flying the Crest LQ 10P must be done by a
certified structural engineer.
Important Safety Information for Mounting Crest LQ 10P speaker systems:
CCaauuttiioonn::Before attempting to suspend these speaker models, consult a
certified structural engineer. Speakers can fall from improper suspension,
resulting in serious injury and property damage. Other enclosures may not
be suspended below one, nor should additional weight be suspended from
one of these units. Use only the correct mating hardware.All associated
rigging is the responsibility of others.
Always use all four inserts of a given group as a set; NEVER use just one
insert to fly a cabinet! The four insert groupings are a top group of four and
a bottom group of four. Some models also have a group of four on the rear
plane of the cabinet.
Maximum enclosure angle from vertical hang: 30˚
Always loop a suitable safety chain or wire rope through the top handle and
firmly attach it to a suitable structural member as indicated by a certified
structural engineer.
The recommended range of torque for the mounting bolt is 3 to 3-1/2
lb./feet of torque. DO NOT OVERTIGHTEN! If an insert spins, it has been
damaged and the cabinet cannot be flown!
Never transport the cabinet while mounted on an array bracket or other
mounting bracket.This may unduly stress the mounting inserts.
WWAARRNNIINNGG!!((nnootteettoossttrruuccttuurraalleennggiinneeeerr))
For the Crest LQ 10P, the thread insertion depth of the end of the
mounting bolt should not be more than 5/16" past the surface of the
cabinet.
If this thread insertion depth is exceeded, then the inserts may be damaged
or unseated from the cabinet, severely compromising its mounting integrity!
The correct mounting bolt diameter and threads per inch are: 1/4" x 20. Use
of a grade five bolt is recommended.
GGEETTTTIINNGGAACCPPOOWWEERRTTOOTTHHEECCRREESSTTLLQQ1100PP
The LQ 10P comes with an 8' IEC connection AC power cord.When using
an extension cord, ensure that it is no longer than necessary and is of a
sufficient current capacity to maintain safety. High current, properly-sized
extension cords will maximize the power output capability of the LQ 10P’s
internal amplifiers. For best results, do not power anything else from the
extension cord used to power the LQ 10P.This minimizes the voltage drop
that all extension cords cause. Running just one extension cord back to the
wall plug for the entire sound system is not the way to maximize sound
system performance.The third wire ground plug on the AC plug should
NEVER be removed or broken off.This seriously compromises safety.
8

LQ™1 P USER MANUAL
9
SSppeecciiaallnnootteeffoorrppeerrmmaanneennttiinnssttaallllaattiioonn
When installing the Crest LQ 10P,AC power runs should be used and a
certified electrician consulted to be sure that all AC wiring complies with
local codes and regulations. Properly affix a cable clip to the cabinet to
relieve strain on the IEC power cord connected to the amplifier module at
(2) so the power cord cannot vibrate loose.
UUSSEEOOFFLLQQ1100PPWWIITTHHAASSUUBBWWOOOOFFEERR
The built-in pole adapter allows use with the Crest LH 4 double 18"
subwoofer system and its accessory pole, Crest part #P00326540.
The pole is 36-3/16" long, with a nominal diameter of 1-3/8".
GGEETTTTIINNGGAASSIIGGNNAALLTTOOTTHHEELLQQ1100PP
There’s a variety of ways to input a signal to the LQ 10P system. Micro-
phone input use is covered in a specific section below.The balanced line
level inputs allow the use of a 1/4" phone plug, either a standard single-
ended (tip-sleeve) plug or a balanced RTS (ring-tip-sleeve) type plug, OR
either a male or female XLR plug. Do not connect cables to the jacks while
the units are ON and theVolume is turned up!
While the standard, single-ended 1/4" phone plug will work well and the
balanced input circuitry will provide some interference rejection, a balanced
cable using either the balanced RTS 1/4" phone plug or the XLR plug will
provide superior interference rejection and performance.With difficult
interference problems, it may be helpful to lift the shield ground on a
balanced cable at the LQ 10P end only. Check any input changes carefully,
always turning the Volume control down before plugging and unplugging
cables.
High-quality premium cables are recommended for the LQ 10P, as these
usually have better shielding and materials and will provide greater long-
term reliability. It is usually a good idea to leave some slack at the input to
the LQ 10P and also to tape the cables down or run them under a cable
guard.This may prevent someone from tripping over them or pulling the LQ
10P over when stand mounted.
LLEEVVEELLCCOONNTTRROOLLAADDJJUUSSTTMMEENNTT
The LQ 10P is equipped with a Volume control to facilitate use in many
different applications.With the Volume control adjusted fully clockwise, gain
is at maximum and the input sensitivity is 0.5 Volts RMS for full-rated
output.When driving the LQ 10P from a mixer, it may be advantageous to
reduce the input sensitivity by turning the Volume control to the halfway
point.The LQ 10P will now more closely match a typical power amp input.
If the mixer board indicates output signal clipping, then the LQ 10P’s full
power capability is not being utilized cleanly. Clipping the signal before it
gets to the LQ 10P is not optimal. In this case, reduce the mixer output
level and turn up the Volume control on the LQ 10P.
The amplifiers in the LQ 10P are equipped with clipping prevention
compression, with an LED indicator to show if compression has engaged. If
the sound seems heavily compressed, check this indicator; if the LED is

LQ™1 P User Manual
10
flashing frequently, then the drive level from the mixer (or the Volume
control on the LQ 10P) needs to be reduced.
When first powering up the sound system, turn on all upstream electronics
first, then the LQ 10P with its Volume control fully counterclockwise (all the
way down). Begin checking levels with the mixer output level controls all the
way down, then bring them up slowly with the LQ 10P Volume control set
to the desired setting (halfway up recommended to start).
UUSSEEOOFFMMUULLTTIIPPLLEELLQQ1100PPssWWIITTHHOOTTHHEERRLLQQSSEERRIIEESS
PPOOWWEERREEDDPPRROODDUUCCTTSS
The provision of multiple parallel inputs allows the inputs of the LQ 10P to
be “daisy-chained” from one to the other. Run the first cable from the mixer
to the first LQ 10P, then hook a cable from one of its inputs to the second
LQ 10P’s input.This can be continued for several units, depending on the
length and total capacitance of all the cables.With a low source impedance,
such as a typical mixer output, and typical balanced cables, two or three LQ
10Ps can be daisy-chained from one output using 30' or 40' cables without
obvious loss of high frequencies.
The LINK jacks (10) can also be used to connect one other LQ 10P or one
other LQ series powered unit and conveniently control levels from just one
of the units. Connect a well-shielded 1/4" to 1/4" phone plug patch cord
from the Link Out jack of one unit whose input is connected to the signal
source, and then plug this cable into the other unit’s Link In jack.The
Volume control of the first unit now controls the volume for both
identically. Do not connect cables to the jacks while the units are ON and
the Volume is turned up! The Link jacks are high impedance single-ended, so
do not run this cable too long. Anything over approximately 20'-30' may pick
up hum or noise or roll-off the highs.
AAPPPPLLIICCAATTIIOONNSS
The LQ 10P has a variety of applications, such as sound reinforcement,
public address, side fill system or musical playback.With the optional
monitor stand kit, the LQ 10P makes an excellent stage monitor.The LQ
10P is also useful in presentations or karaoke using the mic input and
regular line-level inputs in conjunction with one another.
A typical signal source for the line-level inputs (5) of the LQ 10P would be a
sound reinforcement mixing console (mixer) or the output from a CD
player, Minidisc player or tape deck.
TTRROOUUBBLLEESSHHOOOOTTIINNGG
NNoooouuttppuuttaattaallll
First, make sure the unit has AC power and is turned on. If so, the Power
LED (4) should be illuminated. If it is not, check that the On-Off switch (3)
is in the “On” position; check the IEC power cord connection (2), making
sure it is fully engaged and seated. Make sure the AC line cord is plugged
into a working AC outlet, and last, check the fuse (1) {see the REAR
PANEL/Fuse section for safety instructions}.
Make sure that the inputs of the LQ 10P are receiving a signal by plugging
the cable run into the LQ 10P’s inputs to some other device capable of
determining this (for example, a power amp and speaker).

11
If there is still no output, make sure the volume control has been turned up
to a reasonable level (one-third to halfway).
Has the LQ 10P been in direct sunlight or excessive heat? If so, it may have
triggered the thermal protection.Turn off the unit and cool as best as the
situation allows. (DO NOT use liquids for this purpose!)
If there is still no output, it may help to read the owner’s manual completely.
HHuummoorrBBuuzzzz
This can be AC outlet-related.Try plugging the LQ 10P into a different AC
outlet. Sometimes using a different circuit (breaker) for the mixer and the
LQ 10P can cause hum problems.
Check to make sure that shielded cables have been used to get the signal to
the LQ 10P’s inputs. Speaker cables with 1/4" or XLR plugs are very prone
to hum.
Check to make sure light dimmers are not on the same circuit as the
LQ 10P or the mixer (or any source devices). If light dimmers are in use,
then it may be necessary to turn them fully on or fully off to eliminate or
reduce hum to tolerable levels.This is an AC wiring/light dimmer
interference problem, and not the fault of the LQ 10P.
The third wire ground plug on the AC plug should NEVER be removed or
broken off.This seriously compromises safety.
DDiissttoorrtteeddoorrFFuuzzzzyySSoouunndd
First, make sure the mixer (or signal source) is not clipping or being
overdriven.This can sometimes occur when the volume control (6) on the
LQ 10P has been set too low (too far counterclockwise), and it takes a lot
of signal to drive the unit to full power.
Make sure the input plugs are fully seated in the input jacks (5) on the rear
panel of the LQ 10P.
Check to see that the proper inputs are being used (5) for line level signals.
Make sure that a power amp has not been plugged into the input jacks of
the LQ 10P.
If an extension cord is being used to provide the AC power to the unit, is it
of sufficient current capacity and not also being used to supply power to any
other units? See “GETTING AC POWER TO THE LQ 10P” for details.
The LQ 10P has built-in EQ to extend and smooth the natural response of
the speakers in the system. Bass boost and HF EQ have been applied, and
the system has a nominally flat response and should require little, if any,
additional EQ. If excessive additional bass boost or HF boost have been
added externally to the LQ 10P, it may cause premature overload at high
SPLs.Try backing off any external EQ (mixer, rack equalizer) and see if that
clears up any tendency to distort.
TROUBLESHOOTING

12
LQ™1 P User Manual
Finally, be aware that even though the LQ 10P is an extremely powerful and
high output unit, it has limits and may need additional powered units or a
subwoofer to provide enough sound output or coverage. In this case, try
turning the mixer levels down a little to see if the sound clears up.
If after checking all the things listed to check and anything else you can think
of to check safely, and the system still exhibits problems, carefully note all
conditions and check with your Crest dealer for advice.
CCAARREEaannddMMAAIINNTTEENNAANNCCEE
Your LQ 10P is a sturdy and durable product and will provide years of
reliable use if properly cared for. Use common sense and read the safety
warnings to avoid hazardous operating conditions.
SSuunnlliigghhtt//HHeeaatt
Avoid prolonged exposure to direct sunlight, as this may cause the unit to
overheat and thermally shut off. Excessively hot operating conditions can
also cause a thermal shut-down.
Do not store in extremely hot or cold conditions, or extremely high
humidity. Always allow unit to come to room temperature before use.
CClleeaanniinngg
Never clean the LQ 10P while plugged in or turned on! When the unit has
been fully disconnected from AC power sources, a dry cloth can remove soil
or other dirt. Never use strong solvents on the LQ 10P, as they could
damage the cabinet. Do not allow ANY fluids to drip inside the LQ 10P!
TToouucchhuupp
If the LQ 10P cabinet becomes scratched or abraded, it can be touched up
using a black permanent marker. First, if the area to be touched up is larger
than a short scratch, rub it lightly with an unsoaped plastic scrub pad.Wipe
the scratched or abraded area a little at a time with the black permanent
marker and wipe away the surplus with a lint-free cloth. For an overall finish
enhancement and protective coating, use gloves to apply either WD-40®or
Armor-All®protectant to the surface of the plastic cabinet only.The cabinet
will be slippery after these treatments.To minimize this, rub vigorously with
a dry, lint-free cloth.
If the grille becomes discolored or shows signs of a white coating, you can
use a cleaner such as 409®or Fantastic®to remove it. Dampen a clean cloth
with the cleaner and rub it across the front surface of the grille.Wipe off
any excess.
CChheecckkffoorrSSeeccuurreeHHaarrddwwaarree
After the first few months of use, and periodically thereafter, check the
hardware of the Crest LQ 10P for tightness, including the rear panel screws
and those holding the baffle and rear cabinet together.The unit is subject to
a great deal of vibration, and this could cause them to become loose in
time. Be careful not to overtighten or strip out any screws that screw into
the plastic.

13
DDEESSCCRRIIPPTTIIOONN
The Crest LQ10P is a powered, bi-amplified, two-way speaker system
engineered to provide the highest levels of performance and capable of over
120 dB peak SPLs.The enclosure utilizes high-impact polypropylene in an
injection-molded plastic trapezoidal form with a coated, perforated metal
grille to offer a cosmetically elegant yet durable powered speaker system.
This two-way powered system packs a 200 Watt dynamic peak power
amplifier driving a 10" heavy-duty, long-throw woofer with a treated cone
and dust cap for environmental stability.The HF-1 compression driver is
driven by a 70 Watt peak dynamic power amplifier and features a 1.4"
titanium diaphragm.The HF-1 is coupled with a patented Quadratic Throat
Geometry constant directivity horn (US Patent #6059069) with a coverage
pattern of 90˚ by 45˚ molded integrally into the enclosure.
The preamp/EQ’s balanced inputs include one combo female XLR, a 1/4"
RTS phone jack and one male XLR, all connected in parallel.The power
amplifiers providing the bi-amplification are low-distortion units providing
150 Watts RMS into the nominal 8 Ohm load of the woofer and 50 Watts
RMS into the nominal 6 Ohm load of the tweeter.They were selected for
their reliability and superb performance capability. Both amplifiers have
clipping prevention compression, which virtually eliminates audible power
amplifier clipping.
Molded-in handles provide ease of transport, while multiple mounting points
(top and bottom), equipped for an Omnimount™75 series and a molded-in
stand adapter, provide for maximum utility.
AArrcchhiitteeccttuurraallaannddEEnnggiinneeeerriinnggSSppeecciiffiiccaattiioonnss
The Crest LQ 10P has a frequency response from 80 Hz to 20 kHz.The
peak SPL with inaudible distortion reaches 120 dB with music as a source
when measured at a distance of 1 meter and driven to full output capacity.
The system utilizes a 10" heavy-duty, long-throw woofer and a HF-1
compression driver tweeter.The nominal radiation pattern is 90˚ in the
horizontal plane and 45˚ in the vertical plane.
The powered, biamplified loudspeaker system has a group of medium
impedance input connectors consisting of one combo female XLR, a 1/4"
RTS phone jack and one male XLR, all on the rear panel and connected in
parallel.A Link Out and a Link In jack is provided, and level control is
located next to the input jack group.
The system power, amplifiers have an unfiltered frequency response of
10 Hz to 30 kHz, which deviates no more than +0, -1 dB up to rated power;
a damping factor greater than 100 @ 1 kHz into 4 Ohms; hum and noise
better than 90 dB below rated power; and THD and IMD of less than 0.1%.
The woofer amplifier is capable of 150 Watts into an 8 Ohm nominal load,
and the tweeter amplifier is capable of 50 Watts output into a 6 Ohm load.
Both incorporate independent clipping prevention compression.
Care and Maintenance

14
AArrcchhiitteeccttuurraall&&EEnnggiinneeeerriinnggSSppeecciiffiiccaattiioonnss
The input signal is electronically divided into high frequencies and low
frequencies by a staggered pole, third order slope line-level crossover at
2 kHz.The low frequencies are processed to provide bass boost, subsonic
filtering and overall response shaping, and the high frequencies are equalized
for constant-directivity horn EQ and response shaping.
The enclosure is constructed of injection-molded polypropylene of 1/4"
nominal thickness with a UL flame rating and internal reinforcing ribs.A
vinyl-coated, perforated metal grille protects the woofer.The cabinet
incorporates four tall, sturdy rubber feet for floor-standing use and four
mounting point inserts on the top and bottom each for flying use.
The outside dimensions are 18.88" H x 14.00" W x 13.13" D, and weighs
36 lbs. Power requirements: Nominal 100 Watts, 120 VAC, 60 Hz domestic
and 240 VAC, 50 Hz (European).

15
SPECIFICATIONS LQ™1 P
EEnncclloossuurree::
Crest LQ™10P (domestic)
FFrreeqquueennccyyrreessppoonnssee::
80 Hz to 20 kHz
LLoowwffrreeqquueennccyylliimmiitt((--33ddBBppooiinntt))::
80 Hz
UUsseeaabblleelloowwffrreeqquueennccyylliimmiitt((--1100ddBBppooiinntt))::
63 Hz
IInntteerrnnaallppoowweerraammpplliiffiieerrss((@@112200VVAACClliinnee))::
Woofer - 200 Watts peak dynamic power
150 Watts at clipping
Tweeter - 70 Watts peak dynamic power
50 Watts at clipping
NNoommiinnaallsseennssiittiivviittyy((11WW@@11mm,,sswweeppttssiinneeiinnppuuttiinnaanneecchhooiicc
eennvviirroonnmmeenntt))::
96 dB
MMaaxxiimmuummssoouunnddpprreessssuurreelleevveell@@11mm::
120 dB music peak
NNoommiinnaallrraaddiiaattiioonnaannggllee::
90˚ horizontal by 4˚ vertical
TTrraannssdduucceerrccoommpplleemmeenntt::
10" premium, heavy-duty, long throw weather-resistant woofer and
Crest HF™-1 1.4" titanium diaphragm compression driver tweeter
BBooxxttuunniinnggffrreeqquueennccyy((FFbbooxx))::
76 Hz
EElleeccttrrooaaccoouussttiiccccrroossssoovveerrffrreeqquueennccyy::
2 kHz
CCrroossssoovveerrttyyppee::
Internal electronic two-way crossover with CD horn EQ, level
matching, active bass boost and subsonic filtering.The unit’s horn is
spatially aligned with its woofer, so there is no need for phase
alignment or time delay of the signals.
CCrroossssoovveerrssllooppeess::
18 dB/octave (third order) low pass, 18 dB/octave (third order) high
pass, both with staggered poles and driver EQ.
EElleeccttrroonniicciinnppuuttiimmppeeddaannccee((nnoommiinnaall))::
10 k Ohms unbalanced, 20 k Ohms balanced.
IInnppuuttCCccoonnnneeccttiioonnss::
One combo female XLR-1/4" phone jack and one male XLR, all
providing balanced operation in parallel.Also has a 1/4" phone jack-
based loop-thru that allows one other LQ 10P unit to be linked to
the first unit for signal source and volume control.
EEnncclloossuurreemmaatteerriiaallssaannddffiinniisshh::
Injection-molded high-impact polypropylene of a 1/4" nominal
thickness with internal ribbing and bracing, textured finish, and a UL
flame rating. Molded material is dark gray.
MMoouunnttiinngg::
Flying via Omnimount™75 series (top or bottom of cabinet) and four
rubber feet for floor use. Array brackets are available.
DDiimmeennssiioonnss::
Front: 18.88" H x 14.00" W x 13.13" D
480 mm x 356 mm x 334 mm
Rear: 17.63" H x 8.25" W x 13.13" D
448 mm x 210 mm x 334 mm
OOppttiioonnaallaacccceessssoorriieess::
Floor monitor adjustable legs kit
NNeettwweeiigghhtt::
36 lbs.
SShhiippppiinnggwweeiigghhtt::
40 lbs.
AAddddiittiioonnaallrreemmaarrkkss::
Also available as a passively crossed-over unit
LQ 10
EELLEECCTTRROONNIICCSSAANNDDAAMMPPLLIIFFIIEERRSSPPEECCIIFFIICCAATTIIOONNSS::
EElleeccttrroonniicciinnppuuttiimmppeeddaannccee((nnoommiinnaall))::
Primary balanced input: 10 k Ohms unbalanced, 20 k Ohms balanced.
Link Thru input: High-Z
IInnffrraassoonniiccffiilltteerrpprrootteeccttiioonn::
36 dB/octave roll-off
FFoorrbbootthhppoowweerraammppss::
Nominal Amplifier Frequency Response: +0, -1 dB
from 10 Hz to 30 kHz
HHuummaannddnnooiissee::
Greater than 90 dB below rated power.
CClliippppiinnggpprreevveennttiioonnccoommpprreessssiioonnddyynnaammiiccrraannggee::
Greater than 14 dB
TTHHDDaannddIIMM::
Typically less than 0.1%
WWooooffeerrppoowweerraammpp::
Damping Factor: Greater than 100 @ 1000 Hz, 8 Ohms.
NNoommiinnaallppoowweerrrreeqquuiirreemmeennttssooffLLQQ1100PPssyysstteemm((ddoommeessttiicc))::
100 Watts nominal, 120 VAC, 60 Hz.
Features and specifications subject to change without notice.

20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
1
10
100 Q & Directivity Index
Q
Figure 3
20
10
Di
0
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
60
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)
30
40
60
80
100
140
180
300
360
Beamwidth (Degrees)
Beamwidth
Vertical
Horizontal
Figure 2
16
LQ™10P
Graphics
GGrraapphhiiccss

20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
50
60
70
80
90
100
110
120
130
dB SPL (re 20 Pa)
Harmonic Distortion : 10% Rated Power
3rd Harmonic
2nd Harmonic
20 50 100 200 500 1k 2k 5k 10k 20k
Frequency (Hz)
40
50
60
70
80
90
100
110
120
dB SPL (re 20 Pa)
Harmonic Distortion : 1% Rated Power
3rd Harmonic
2nd Harmonic
17
LQ™10P
Graphics
GGrraapphhiiccss

-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o
200 Hz 250 Hz 315 Hz
-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o
800 Hz 1 kHz 1.2 kHz
-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o
400 Hz 500 Hz 630 Hz
LQ™10P
Horizontal Polar Patterns
6 dB per Division
18
PPaatttteerrnnss

-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o
1.6 kHz 2 kHz 2.5 kHz
-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o
6.3 kHz 8 kHz 10 kHz
-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o
3.15 kHz 4 kHz 5 kHz
LQ™10P
Horizontal Polar Patterns
6 dB per Division
19
PPaatttteerrnnss

-90o
-60o
-30o
0o
30o
60o
90o-90o
-60o
-30o
0o
30o
60o
90o
12.5 kHz 16 kHz
LQ™10P
Horizontal Polar Patterns
6 dB per Division
20
PPaatttteerrnnss