User manual KLARK TEKNIK DN360

[. . . ] OPERATORS MANUAL DN360 Klark Teknik Group, Klark Teknik Building, Walter Nash Road, Kidderminster. Tel:+44 1562 741515 Fax:+44 1562 745371 Email: sales@ktgplc. com Website: www. klarkteknik. com Walter Nash Road, Kidderminster, Worcestershire. Fax: (44) (0) 1562 745371 Company Registration No: 2414018 SI GN A L P R O CE SSI N G BY D E FI N I T I ON abc d abc BETTER BY DESIGN DESIGNED FOR APURE PERFORMANCE DECLARATION OF CONFORMITY We, Klark Teknik Group (UK) Plc of, Klark Teknik Building, Walter Nash Road, Kidderminster, Worcestershire, DY11 7HJ Declare that a sample of the following product:Product Type Number DN360 Product Description Graphic Equaliser Nominal Voltage (s) 115V AC 230V AC Current 60mA 120mA Freq 50/60Hz to which this declaration refers, is in conformity with the following directives and/or standards:Directive(s) Test Standard(s) UL 813 CSA 22. 2 No1 M90 EN 60065 EN 50081-1 : 1992 EN 55022 Class B EN 50082-1 : 1994 ENV 50140/ 8-93 ENV 50140/ 2-95 EN 5014 1 : 1993 EN 60801-2 : 1993 IEC 801-4/88 Low voltage Directive 73/23/EEC EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC EMC 89/336/EEC amended by 92/31/EEC & 93/68/EEC Signed:. . . . . . . . . . . . . . . . . . . . . . . . . . . . Merrey Jnr Date: 27th August, 1999 Authority: Managing Director, Klark Teknik Group (UK) Plc Attention! [. . . ] In this event, the input level control should be turned down to correct the problems. However, if the input signal itself exceeds +19dBu the input stage will be overloaded. If this problem arises, the signal level from the output of the preceding piece of equipment must be turned down. The high quality faders used in this equaliser have an oil-damped action for smooth operation and feature a centre detent following accurate "flat" setting. Rear Panel Functions The mains fuse is located in a fuse holder, fitted to the rear panel. Always replace with the correct type and rating of fuse, as indicated adjacent to the fuse holder. Input and output connections are made via complementary XLR style sockets. Main is supplied via an IEC standard 3 pin connector. A compatible power cable is supplied with the unit. The serial number of this unit should be quoted in any correspondence concerning the unit. 4 Specifications Input Type Impedance ( alanced Unbalanced Output Type Min. Also, equalisation cannot overcome the lack of sound clarity caused by rooms with unduly long reverberation times though they may be able to effect some improvement in the intelligibility. On the other hand, the sound company who may well have to set up in different venues night after night have little or no control over the acoustics of the buildings and so have to use equalisers to arrive at a compromise solution. Depending on the room, some compromises will be more successful than others. Again, effective use of the equaliser means employing the services of a spectrum analyser. It is however not always desirable to achieve a dead flat room response. For example, applying substantial amounts of bass boost to try and restore a weak bottom end is going to use up large amounts of amplifier power and the extra loudspeaker cone excursions so caused will rob the system of headroom and may cause distortion. The harmonics produced by an amplifier driven into clipping may also damage the high frequency drivers and will at any rate sound unpleasant Therefore, reducing the low frequency output may produce real advantages by way of improved intelligibility and subjective naturalness and this is particularly true of buildings made from concrete or stone where much of the bass is reflected rather than absorbed. Equally, rolling off the high frequency end above 5kHz may also contribute to a more natural sound. The resulting house curve then is far from flat but may will be the ideal compromise. Depending on the individual sound system and the environment, the shape of the optimum house curve will vary and a degree of experience is needed in order to achieve the best results. It should also be borne in mind that the ideal house curves for pure speech and music will not be the same. +10 0 dB -10 -20 100 1k Frequency Hz 10k Typical House Curve 13 In live sound applications, graphic equalisation is almost always applied separately to the stage monitor of foldback system to reduce the level of those frequencies that would otherwise cause feedback problems. These problems came about due to peaks in the frequency response curves of the monitor speaker systems, monitor positioning, and sound reflected from the stage walls. An analyser is probably best employed to do this effectively but many experienced engineers rely on their ears. In addition to compensating for room acoustics, equalisation can also be used to counteract some of the problems caused by microphone characteristics and positioning or to tailor the response to improve speech intelligibility. Also, many speaker systems have a far from flat response, particularly mobile systems that have to be positioned in physically convenient places rather than the acoustically ideal ones. When equalising the room, these deficiencies are also catered for to a large extent. Whatever the application, it is generally better to try to attenuate peaks rather than to attempt to boost the surrounding frequencies to the same level, Furthermore, all peaks can be reduced be attenuating their respective band but some response dips simply cannot be corrected. [. . . ] If using a real time analyser ensure that the microphone is in a sensible position i. e within the coverage area of the system and not in an area where strong local acoustics effects might be expected such as within 1 metre of a rear or side wall or in a balcony opening. 16 A good idea is to rotate the measuring microphone in a wide arc or circle round the measuring position and to see if any strong interactions occur causing large deviations in response. Also ensure that the ambient noise level is at least 6dB (preferably 10dB) below the signal level you are using. Having set up the desired house curve as smoothly as possible, move round and check the response throughout the listening area. Do not forget that some interaction will occur between a particular filter and its adjacent bands. [. . . ]