Summary of KF740
Page 1
Kf740 loudspeaker owner’s manual including kf740p.
Page 2
Page 2 of 22 kf740 owner’s manual.
Page 3
Table of contents 1. Read this first................................................................................................................ 4 1.1 ec statement of conformity ............................................................................................. 4 1.2 saftey precautions...
Page 4
1. Read this first 1.1 ec statement of conformity this document confirms that the range of products of eastern acoustic works bearing the ce label meet all the requirements in the emc directive 89/336/eec laid down by the member states council for adjustment of legal requirements, furthermore the pr...
Page 5
2. Introduction the kf740 series is a mid-sized line array system designed to bridge the gap between the popular kf760 and kf730 series. With output capabilities resembling the kf760 and a footprint similar to a kf730, the kf740 delivers 3-way, kf series performance in a flexible, easy-to use system...
Page 6
4. Kf740 array design 4.1 eaw resolution use eaw resolution design software when designing a kf740 array. It can be found in the downloads/software section of the eaw website (www.Eaw.Com). Resolution’s primary function is to determine the configuration providing the best vertical performance for a ...
Page 7
Warning: ground-stacked arrays, especially the maximum recommended arrays, requires assembly by personnel qualified to ensure adequate stability from tip over for the particular application. See section 6 for correct array assembly. Mechanical assistance will be required to lift and position enclosu...
Page 8
5. Array operation 5.1 overview the operation of a kf740 series system involves: 1. Understanding the principles on which it operates. 2. How to electronically configure it for a specific task. 5.2 engineering design how a kf740 array works: divergence shading in almost any venue, there are signific...
Page 9
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...
Page 10
Failure. The test signal has a 6 db crest factor (peak to average ratio). A maximum continuous voltage limit for the loudspeaker is then determined based on the test results and on the transducer’s application in the loudspeaker. The powers listed in the table are calculated as the square of the rms...
Page 11
5.8 input connections 5.8.1 kf740 input connections there are two neutrik nl8 connectors on the rear of each kf740. These connections are wired in parallel inside of the unit. Use one input to power a system of kf740 loudspeakers and the other to loop through to other units in the system, it does no...
Page 12
6. Rigging kf740 series arrays can be suspended or ground-stacked. When suspended, the kf740 can be used in conjunction with the kf730, kf737, kf760, and kf761 with the use of adapter bars. This chapter details how to physically configure kf740 series arrays. The following are the recommended method...
Page 13
Determine the requirements for and to implement overhead rigging. 6.3.1 attachment to the fly-bar the kf740 fly-bar design permits several methods of attachment. 1. Center holes: use one of these holes for single point attachment, the particular hole being dictated by resolution to result in the c...
Page 14
6.4.3 hinge and hinge tube holes danger: ensure each quick release pin used in assembling an array is fully inserted and engaged into the hinge tubes and hinge holes. Only use the quick release pins supplied or equal. Pins of different lengths, diameter, or materials will compromise the structural i...
Page 15
Kf740 fly-bar hinge tube holes kf740 hinge and hinge tube holes locking pins warning: due to the center of gravity with a suspended curved array, any open splays between enclosures may close up unexpectedly either during array assembly or disassembly. To prevent this occurrence and possible injury t...
Page 16
6.5 suspension procedures it is recommended when rigging an array of kf740 loudspeakers to attach one enclosure at a time. information on rigging kf740 arrays to other eaw line array products can be found in section 6.6 of this manual and with the instructions for individual adapter-bars. reve...
Page 17
7. Attach each hinge to the hinge tube by inserting a quick release pin (removed in step 2) through both. 8. Lift the array, with the kf740 attached only by its rear hinges, to a comfortable working height for the next step. Note: the following two steps require two people 9. The first of two people...
Page 18
Note: note that in this application the top portion of the rear hinge will be pinned twice. Pin hole 1 in the ab and hole 4 through the top of the hinge tube. Then mount the ab7674-73 to an array of kf760 or kf761 as though it were a kf760 or kf761 by pinning the adapter-bar into the bottom kf760/76...
Page 19
6.7.2 stacking the first enclosure (fly-bar as the base) caution: when attaching hinges to hinge tubes in step 4, use the correct holes as determined by the resolution or by the user-desired angles to achieve the desired aiming angle. Failure to follow this instruction can result in poor acoustical ...
Page 20
7. Service and maintenance 7.1 general service for any faults that cannot be field-repaired as noted below, contact the eaw service department listed in chapter 7 to determine the appropriate action. This applies to both warranty and non- warranty faults. 7.2 rigging service because of the potential...
Page 21
Kf740 owner’s manual page 21 of 22 7.4.2 periodic inspection perform complete and thorough inspections on a routine, periodic basis. The interval between inspections and scope of the inspections will depend on the frequency of system usage and the conditions of use. This interval must not exceed 1 y...
Page 22
8. Contacting eaw we have tried to answer any questions you may have about the kf740 in this manual. Should you need further assistance, please do not hesitate to contact us. You can contact us in several different ways. 8.1 operating questions and servcice information for questions about configurin...