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5.5 

AMPLIFIER GAIN SETTINGS 

In order for Divergence Shading to work properly, all amplifiers for all passbands must be set to 
the same voltage gain, regardless of their power output ratings. Among other things, equal 
amplifier gains are required to maintain array coherence throughout the venue. 
 

NOTE: This does NOT mean the same input sensitivity, but the same input to output voltage 
gain. Consult your amplifier manufacturer if this cannot be readily determined. Do not selectively 
boost or attenuate loudspeaker levels at the amplifiers in order to achieve consistent SPL at 
various distances. This is achieved by adjusting the array curvature as described above.  

 

5.6 

USER ADJUSTMENTS 

5.6.1 

Equalization 

EAW recommends that 1/3 octave or careful use of parametric equalization be used to modify 
performance to accommodate a particular program, venue characteristics, or personal taste.  
 

5.6.2 

Array Measurements 

It is recommended to use a multi-channel measurement software platform to investigate the 
interaction between an array and the acoustical characteristics of a venue. This is a fast, yet 
sophisticated, process that will indicate problem areas due to particular venue characteristics. 
Usually it is a matter of applying small amounts of 1/3 octave or parametric equalization to adjust 
significant anomalies.  
 

5.7 

AMPLIFIER POWER REQUIREMENTS 

As is true of all professional loudspeaker systems, the performance of the KF740 depends on 
amplifiers delivering an adequate supply of clean power. Determining the appropriate power 
amplifier wattage for a given loudspeaker and application is a subject of some debate. In fact, 
there are three distinct issues regarding amplifier power as discussed in the next sections: 
“Power Ratings,” “Selecting an Appropriate Amplifier Size,” and “Operating Limits.” 
 
For more information on selecting amplifiers, please consult the Frequently Asked Questions 
(FAQ) portion of the EAW web site, EAW’s Technical Paper on Amplifier Power also available on 
the EAW web site; or contact EAW Applications Support Group. 
 

5.7.1 

Power Ratings 

The KF740 is a Tri or Quad amplified loudspeaker depending on the end users preference, 
requiring power for two LF, one MF, and one HF amplifier channel.  LF sections can be 
connected in parallel to a single amplifier channel or each can be connected to a separate 
amplifier channel.  The following tables list the rms voltage limits for the KF740.  
 

NOTE: The rms Voltage Limit listed for each sub-system (LF, MF, or HF) is the same for any 
enclosure quantity. The wattages are calculated using the Voltage Limits and the overall nominal 
impedance for the each listed quantity of KF740 loudspeakers. 

 

Section 

Nominal Z 

Wattage 

rms Volts 

LF Side 

8 700 

W 

74.83 

LF Front 

8 700 

W 

74.83 

MF 

8 625 

W 

70.71 

HF 

8 200 

W 

40 

 

CAUTION: The rms voltage limits listed above are related to the thermal limits determined from 
EAW’s standard power test. In this test, transducers are “exercised” to a point of damage or 

KF740 OWNER’S MANUAL   Page 9 of 22 

Содержание KF740

Страница 1: ...KF740 LOUDSPEAKER OWNER S MANUAL Including KF740P ...

Страница 2: ...Page 2 of 22 KF740 OWNER S MANUAL ...

Страница 3: ...rocessing 8 5 5 Amplifier Gain Settings 9 5 6 User Adjustments 9 5 7 Amplifier Power Requirements 9 5 8 Input Connections 11 6 RIGGING 12 6 1 Rigging Warnings 12 6 2 Suspension Load Rating Working Load Limits WLL 12 6 3 Fly bar Rigging Recomedations 12 6 4 Attaching Enclosures to the Fly Bar 13 6 5 Suspension Procedures 16 6 6 Adaptor Bars 17 6 7 Ground Stacking Procedures 18 7 SERVICE AND MAINTEN...

Страница 4: ...iptions of the safety precautions CAUTION describes an operating condition or user action that may expose the equipment or user to potential damage or danger WARNING describes an operating condition or user action that will cause damage to the equipment or injure the user DANGER describes an operating condition or user action that will immediately damage the equipment or be extremely dangerous or ...

Страница 5: ...gging information for this purpose is provided in this manual 2 2 KF740P The KF740P is physically configured for permanent installation Full rigging information and instructions for the KF740P is provided with the KF740P rigging hardware kits All non rigging information provided herein applies to the KF740P 3 UNPACKING 3 1 CONTENTS KF740 1 KF740 loudspeaker 6 Tethered quick release pins 3 2 SHIPPI...

Страница 6: ... s dimensions Difference between the array beamwidth angle and the needed coverage angles Height of the array and trim height to the bottom of the array from the floor Pick Point on the Fly Bar to achieve the calculated array angle when suspended Weight of the array 4 2 FILL COVERAGE 4 2 1 Up Fill Some applications such as theaters and small arenas can require up fill coverage from the array In th...

Страница 7: ...bwoofers in a ratio of two KF740 loudspeakers to one SB1001 1002 subwoofer NOTE Bass performance is often highly program or venue dependent as well as subjective as to quantity and quality For this reason the type quantity and disposition of subwoofers may vary considerably with the application The quantity recommendations below are for general purposes providing a balanced system for most music a...

Страница 8: ... understand how a KF740 array works Specifically 1 More splay at the rear of the enclosures turns the volume up adds less curvature to the array 2 Less splay at the rear of the enclosures turns the volume down adds more curvature to the array 3 More enclosures provide a greater vertical coverage angle 4 Fewer enclosures provide less vertical coverage angle EAW Rersolutionuses the above variables t...

Страница 9: ...ker systems the performance of the KF740 depends on amplifiers delivering an adequate supply of clean power Determining the appropriate power amplifier wattage for a given loudspeaker and application is a subject of some debate In fact there are three distinct issues regarding amplifier power as discussed in the next sections Power Ratings Selecting an Appropriate Amplifier Size and Operating Limi...

Страница 10: ...arts This provides a peak voltage capability of 6 dB above the specified rms voltage limit This assumes the audio signals will have a peak to average ratio in excess of 6 dB which is usually but not always true Under this condition the thermal limits are unlikely to be exceeded While this rule of thumb is consistent with the EAW s testing parameters it does NOT guarantee trouble free operation Tha...

Страница 11: ...he system it does not matter which input is used for either purpose KF740 INPUT NL8 each of two LF Side PIN 1 LF Side LF Front PIN 2 LF Front MF PIN 3 1 MF HF PIN 4 HF 5 8 2 KF740P Input Connections There are two 8 terminal barrier strip connectors on the rear of each KF740P The connectors are wired in parallel so that the second connector can be used to loop signals to additional KF740s The conne...

Страница 12: ...sult in damage to the equipment injury or death CAUTION A KF740 weighs approximately 107 lb 49 kg Always use two people or mechanical assistance to lift a KF740 IMPORTANT RIGGING NOTE Each Quick Release Pin used to attach enclosures together can be inserted into one of several holes in both the Hinges and Hinge Tubes integral to the enclosures The particular holes used set the splay angle between ...

Страница 13: ...esult in the correct array tilt angle when all enclosures are flown One motor may be easier to deploy than two 2 Employ two chain motors one attached to the front of the Fly Bar and the second to the rear The attachment can be to the Center Holes The array will be easier to assemble because it allows tilting the enclosures already suspended to better match the angle of the next enclosure to be att...

Страница 14: ...will determine the splay angles between the loudspeaker aiming axes The rear splays required for these splay angles and the Hinge and Hinge Tube Holes to use to achieve them are designated by Resolution KF740 to Fly Bar Rear Hinge Hole Rear Hinge Tube Hole Front Hinge Hole Front Hinge Tube Hole 0 2B 1A Upper 3 0 2A 1A Upper 6 0 3A 1A Upper KF740 to KF740 1 Front Splay Angle Rear Hinge Hole Rear Hi...

Страница 15: ...ns are intended for use as locking pins Certain array configurations and array tilts can cause the collapse of any open splays between KF740 enclosures This is more likely to occur the more the array is curved relative to its length Locking pins can prevent the occurrence of splay collapse Locking pins are inserted in the Hinge Tubes through the hole in the part of the Hinge that is captive to tha...

Страница 16: ...tion 2 Remove the Quick Release Pins from the top of the enclosure s Hinge Tubes and lock the rear hinges as described in 6 4 5 3 Lower the fly bar onto the rear hinges of a KF740 and pin them 4 Fully lower the fly bar onto the KF740 until the front of the fly bar is resting on the KF740 5 Extend the front hinges into the Fly bar and pin them 6 Lift the array to the working height needed for the n...

Страница 17: ...xpensive electronic clinometers can also be used Place the angle finder against one of the rigging tubes on the face of the uppermost enclosure in the array that can be physically reached Adjust the angle of the entire array so that the face of this enclosure is set at its prescribed aiming angle listed in Resolution 6 6 ADAPTER BARS KF740 arrays can be mounted under an array of KF760 or KF761 and...

Страница 18: ... rigging an array of KF730 or KF737 loudspeakers Improper handling of products or rigging procedures can cause damage to the product personal injury or death 6 7 GROUND STACKING PROCEDURES Up to six KF740 loudspeakers may be ground stacked Always stack KF740s using the KF740 Fly Bar as a base for the stack DANGER A ground stack of more than six KF740 enclosures may shift the center of gravity maki...

Страница 19: ... rear Hinge Tubes as a locking pin 6 7 3 Stacking Additional Enclosures Fly Bar as the base CAUTION When attaching Hinges to Hinge Tubes in step 5 use the correct holes as determined by Resolution or by the user desired angles to achieve the desired splay angle Failure to follow this instruction can result in poor acoustical performance 1 Lift a KF740 from its pallet and turn it upside down so the...

Страница 20: ...g Use your ears and test signals or other sound source to determine which one is at fault Normally a faulty transducer requires service or replacement by EAW 7 3 2 Input panel Internal Components and Wiring Faults with these items will usually cause transducers to stop working or possibly be intermittent Check that audio signals pass from the input jacks to the transducer terminals Many faults wit...

Страница 21: ...Cracks or breaks in the wood 2 Bent wheels 3 Wheels that bind when swiveled or rolled 4 Damaged tires 7 5 MAINTENANCE 7 5 1 Performance Testing Listening tests and or formal measurements should be done periodically The interval between such tests will depend on the frequency of system usage and the conditions of use All transducers should be tested for functionality and proper performance A sine w...

Страница 22: ...RVCICE INFORMATION For questions about configuring or operating the loudspeakers contact EAW Applications Support Group Tel 508 234 6158 Tel 800 992 5013 USA only Fax 508 234 8251 e mail asg eaw com 8 2 GENERAL For all other information Mail Eastern Acoustic Works One Main Street Whitinsville MA 01588 USA Tel 508 234 6158 Tel 800 992 5013 USA only Fax 508 234 8251 Web Site http www eaw com e mail ...

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