QSA 200i User Manual
Contents
1. 10000000 1990000000 LEITERN 200i User Manual AMP AMP CLIP LIMIT AMP CUP LIMIT O gt OPERATING TIPS QSA200i Active Loudspeaker User Manual co TROUBLESHOOTING 200i User Manual Troubleshooting Buzzes and noises in the sound system Getting rid of unwanted noises is a study in itself Most of the noise apart from undesirable program will fall into three categories 1 WHITE NOISE This is the hiss that suggests that the gain structure is set incorrectly Something in the signal chain is boosting too much or an input is set too sensitive If your equipment has gain switches on it set them all the same If the switch is labelled 4dB set them all to that figure If one piece of equipment seems to be overloading set them all to 10 20dB and be prepared to boost the input level of the QSA input The last unit in the chain should be set to 4 dB at the output stage if possible when connected to the line level input of the QSA series input 2 LOW FREQUENCY HUM This is often caused by noise from the power leads being picked up by the audio signal cables The preferred solution is to connect up your system with balanced XLR microphone cables Especially if you are running the cables a long distance more than 5Mtrs 15 Ft The other solution is to make sure that your audio cables are as far from power cables as possible engineeri2. Active Loudspeaker User Manual Quest Quest QSA200i nual engineering engineering Quest QSA 200i Specifications Accessories HF Coverage Angle 90 x 45 Revolving horn flare QSSAL Heavy duty aluminium speaker stand with carry bag 2 5 er y Amplifier Power HF 50 Watts LF 100 Watts WBFJ8 Wall bracket foldback adaptor Lu E a O O N LL N O Enclosure Injection molded plastic u Lu O a QO 7 lt Input Connections 2 channels XLR in XLR through out Net Weight 8kg 7 e QB350 amp QSSAL WBFJ8 Product features Two channel independent XLR mic line inputs Uniform high frequency coverage with custom designed rotating HF wave guide XLR line our with mix add function Great sonic performance through analogue Long lasting heavy duty Quest speaker engine signal processing components Micro fan cooled multi way power amplifiers i i WBU8I WBFJ8 with QSA200i attached Steel protective full front grill All specifications are correct at time of printing Quest Engineering reserves the right to change specifications at any time and won t be held responsible for any typographic errors in this publication User Manual QSA200i QSA200i User Manual Active Loudspeaker Active Loudspeaker www questaudio net
3. down The reverse is true when powering up Mixers and effects on first power amplifiers or powered speakers on last User Manual QSA200i Active Loudspeaker engineering Inputs and outputs The inputs can accept both XLR and phono connectors If you are connecting multiple boxes together is unprofessional practice to use a mixture of both phono and XLR types of leads Use one or the other otherwise an out of phase situation can result Tips on flying clusters When very high output or broad coverage is required it is common practice to assemble an array of speakers together in rail N IN SS ae 200i User Manual In a flown horizontal array of high mid configured speakers best results are obtained by angling the boxes apart slightly at the front of the array while the rear of the boxes must be together on the same vertical plane The purpose is to minimise phase shift and interference effects between the boxes If two boxes are directing acoustic energy into the same coverage area loss of smooth frequency response will result This is called lobing as fingers of both frequency peaks and dips spread out across the coverage area especially at the area where the signal from the overlapping coverage converges QSA 200i Array m ol Q SS DN INPUTS OUTPUTS QSA200i
4. Quest engineering QSA 2001 ACTIVE LOUDSPEAKER user manual m CONTENTS 200i User Manual Contents engineering Safety Installation Connections Glossary Operating Tips Troubleshooting Inputs and Outputs Specifications Accessories 03 04 05 06 07 08 09 10 11 User Manual QSA200i Active Loudspeaker engineering Safety Precautions Flying and installation of this speaker cabinet must be carried out by suitably qualified personnel following the approved safety standards Do not attempt to clean any plastic parts with solvents or petrochemical based cleaners The power voltages inside this device are high and could cause serious injury or death if touched while the power is connected Do not open the amplifier case as there are no user serviceable parts inside gt SD Attention Before connecting or operating your new Quest Engineering speaker please study the accompanying instruction manual paying particular attention to the operating precautions and wiring procedure Quest Engineering will not assume responsibility for incorrect installation or operation of this product 200i User Manual Do not expose the speaker cabinet to direct precipitation or stand in water Liquid getting into the box will risk a short circuit and will be hazardous o o Do not stack the speaker cabinet in a manner that could cause injury should a
5. ass pu enhancement Coupled with a Quest Engineering engineering sub bass system the QSA200i will provide very good full bandwidth audio coverage at medium to high sound pressure levels Installation Temporary installation is possible with the 35mm stand mounting in the base of the enclosure A Marten tE gel Fold back installation is possible with the Se id u addition of the floor stand wall bracket optional accessory WBFS8 Flying installation 1 Power amp active indicator 7 Line out This is a through output of the Ea aan os i Po same level as the line input Two M6 thread inserts are located on the top and 2 Clip limit indicator If this LED illuminates for one under the QSA series enclosures These are more than an occasional flash turn down the 8 Loop Mix Output mix selector signal in out intended to be used with the designated wall mixer output If you need more volume set up through mount bracket more speaker boxes 9 Power on off switch i i i 3 Microphone balanced input volume control QSA Series flying accessories p p 10 Power supply input Make sure that the See page 11 for list of accessories 4 Line level volume control voltage selector is set for your Country s f i correct voltage 5 Microphone level low impedance input A 11 Protection fuse Use only fuses of the correct 6 Line level balanced input User Manual QSA200i Active Loudspeaker To mixer or other 4 dB or les
6. cabinet become dislodged Do not place sources of heat on the speaker cabinet such as lighting equipment or smoke machines Very important Before using your speaker check to make sure that the selection of the power supply voltage 115 230 Volts is set correctly for your country An incorrect setting can lead to severe damage to your new powered speaker on activation If you are not certain that it is set correctly check with your Quest Engineering dealer Register Your Product Thank you for choosing Quest Please take the time to complete your procuct registration card which is included with the packaging Registering your Quest Engineering product will e CONFIRM YOUR WARRANTY e REGISTER YOUR PRODUCT e PROTECT YOUR NEW PRODUCT 2 SAFETY QSA200i Active Loudspeaker User Manual 200i Quest User Manual engineering Quest 200i engineering User Manual Description The QSA speaker range is a two way active bass reflex design suitable for mobile or installation use The power amplifiers are multiple integrated Safe installation procedures e The QSA200i should be installed using the WBFS bracket and secured by both top and bottom nut inserts Quest QSA200i Series Rear Panel Description AB class design capable of high power yet light e The QSA200i can be hung with I bolts DN in weight The
7. lead wired in reverse at one end and that the speaker boxes are all wired correctly internally This can happen when a speaker box has been repaired and then not assembled with the wiring connected correctly User Manual QSA200i Active Loudspeaker engineering Operating Tips To avoid overloading the pre amp inputs always operate the master volume at a high level and control the volume from the input volume The ideal situation is to have all the components of the audio chain operating at the same operational range Do not run the system with the mixer peaking in the red while the box is turned down Also do not operate the system with the input peaking red overload light on or flashing and the master volume turned down Red lights flashing on a mixer indicate distortion If you have a mixer with the facility to show you the input level on a meter for example then you push a CUE PFL button set the input level to below the level of the red end of the LED ramp If you run the row of red lights to the end of the ramp you will cause distortion at the very start of the pre amplifier stage of the mixer At this point it will sound dirty and fizzy regardless of how good the rest of your sound system is The rest of the system will be reproducing a distorted sound If you need more volume turn down the input signal so it is out of the red and turn up the output of the mixer MIXER MIXER MIXER 5
8. n example of incorrect gain structure is when a mixer is turned up to the point of audible distortion red lights flashing serious overload and the power amplifiers are turned down and running at only 30 power COMPRESSION An electronic device that reduces the dynamic range In other words makes the loud parts of the music less loud and the quiet parts appear louder When used correctly it can make live music sound more even and balanced Output Level __ _ Compressor Threshold eg LIMITER An electronic device that will prevent the signal from exceeding a set level of output Normally used as a system protection to prevent it from being over driven by excessive input 10 Limiter Threshold wa Output Level PHASE IN or OUT OF PHASE This really means speaker polarity The input terminals of a normal loudspeaker have a positive red terminal and a negative black terminal In the case where there are two speakers operating as a pair or together as an array will need to all be wired the same way If a speaker connecter speaker lead or speaker box is wired in reverse to a box near it loss of performance will result This may be in the form of lost low frequency response In this case you will see the bass speaker working hard but as you move away from the box the bass frequencies will seem to disappear Check that your speaker leads do not have one
9. ng 3 BUZZ Sometimes you can experience a hum and buzz together A buzz is almost always a problem with the earthing of the system It will often occur when you have the system powered from sperate power outlets in the same building or audio and lighting sharing a common power circuit Even when the audio and lighting systems are powered from separate sources there can still be a common earth between them For example a smoke machine may be powered from the lighting system yet the trigger mechanism could be connected to the audio system through the audio multi core snake An earth connection between the audio and lighting will now exist and a buzz could be amplified in the audio system The simple solution is to power your audio circuit and everything connected to it from the same source If the buzz persists check your signal cables one may have an earth shield disconnected A cheap but possibly life saving investment is a domestic power tester to check that the power supply sockets are correctly wired Faulty or incorrectly wired power is a booby trap that is more common than you think It is wise to avoid switching on or off devices in the signal path while the speaker system is powered and turned up Otherwise loud clicks and bangs could result When shutting down the system always turn the speakers off first This is to prevent the speaker amplifying the sound of the other equipment in the chain being shut
10. re are separate amplifiers for the attached to the top 8mm insert bolts nn I m RER 3 Z high and low frequency drivers and both are ame O ar O ia E ll e e Under no circumstances attach the box with less Quest SN 3 Z that monitors peak and RMS power and makes than two of the threaded inserts see figure a engineering WW oO E EQ and time alignment corrections Casa 200i eo lt x e The speaker box must not be installed in a manner Active 2 way NA _I The operation of these devices will not affect where the weight is not equally distributed between ae VOL D Zermessegbersmmsnnfssennmssssesssnsmenerssssonnsnen 4 O l audio quality due to their advanced design two insert points e Lu lt Audio processors will control and protect the e One pair of threaded inserts may only carry i Z E system to a reasonable degree but are not a the weight of one box Therefore multiple box 5 Z N substitute for sensible operation The system will rigging from one pair of insert points should not be i oO Z sound at its best when mixers and other signal attempted see figure b O processors in the audio chain are not being over e Do not locate boxes near sources of moisture or 6 driven into distortion where water can enter the box see figure c EN Q Full range or Sl mid high applications 7 The design characteristics make the QSA series suitable for both full range use or as the high mid o component of a multi way system with sub b
11. s line level Amp rating If it blows more than once return the box to a Quest Engineering service centre QSA200i User Manual Active Loudspeaker GLOSSARY 200i User Manual Glossary engineering Basic professional audio practice and hints for best results PRE AMPLIFIER That part of the signal chain where a signal from a microphone turntable CD player or other signal source is first amplified This will normally be at the input of a mixer and is necessary to boost the signal enough to be then mixed and amplified by a power amplifier POWER AMPLIFIER Boosts the signal enough so it can be reproduced by a loudspeaker ELECTRONIC CROSS OVER Splits up the full range audio signal to separate high and low frequencies This is done to send low frequencies to the bass speaker and high frequencies to the tweeter or high frequency horn driver Hi Freq Amp Electronic Hi Freq xover m Drive Input gt Signal a E Low Freq Drive Low Freq Amp SELF POWERED Refers to a speaker or a mixer that contains a power amplifier CLIPPING Distortion that is caused by having too much signal at an input causing the amplifier to overload It is called clipping because it will cause a smooth wave to be cut off at the peak of the wave In other words clipped Clipping Ba GAIN STRUCTURE The relationship of input levels to output levels in a signal chain A
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