User manual MARTIN AUDIO AM906 SCHEMATICS

[. . . ] After unpacking the system, examine it carefully for any signs of transit damage and inform your dealer if any such damage is found. It is suggested that you retain the original packaging so that the system can be repacked at a future date if necessary. Please note that Martin Audio and its distributors cannot accept any responsibility for damage to any returned product through the use of non-approved packaging. Standards Martin Audio Wavefront Compact Series products conform to the requirements of the EMC Directive 89/336/EEC, amended by 92/31/EEC and 93/68/EEC and the requirements of the Low Voltage Directive 73/23/EEC, amended by 93/68/EEC. EMC Standards Applied: Emission EN55103-1:1996 Immunity EN55103-2:1996 Electrical Safety EN60065:1993 About this Applications Guide This Applications Guide is based on Wavefront Compact field experience and general acoustical principles. [. . . ] 1) 2) 3) 4) 5) Set the front & rear WSX arrays to match the main front & rear corner system farfield levels around 120Hz Set the front & rear W8Cs to balance the main systems + WSXs in the nearfield Set the flown centre W8Cs to balance the main systems + WSXs + W8Cs in the L, R & centre/mix position midfield areas Set the apron W3s to fill the L, R & centre nearfield region Set the apron WSXs to match the W3s around 120Hz Island stages (not shown) Island stages are simply four-sided versions of examples 3 and 5 and should be aligned using the same process. MARTIN AUDIO - APPLICATIONS GUIDE, AM906 SERIES All material © 2007. Subject to change without notice. CONTENTS < > ENGLISH ONLY GUIDES PRINT 4. 10 Spaced systems Whenever two or more loudspeaker systems are fed with the same signal and their coverage overlaps, sound addition and subtraction will take place depending on the listener's position. In the following example, the off-axis listener may hear delayed sound from the right hand system. The two loudspeakers are driven in phase (both were +ve just before the instant shown) but the extra distance travelled by the second (R) signal causes it to be out of phase at the listener position at that particular frequency (R is -ve while L is +ve). Reflections Remember that a strong side wall reflection will act like a second source and the direct and reflected signal will combine as if they were two sources. The following illustration shows what will happen. The direct signal will combine with the reflected signal as if it were a phantom source in the position shown. MARTIN AUDIO - APPLICATIONS GUIDE, AM906 SERIES All material © 2007. Subject to change without notice. CONTENTS < > ENGLISH ONLY GUIDES PRINT Addition & Subtraction The above shows how two pairs of sine waves (with identical amplitude and frequency characteristics) will sum. Pair (b) are out of phase and cancel. MARTIN AUDIO - APPLICATIONS GUIDE, AM906 SERIES All material © 2007. Subject to change without notice. CONTENTS < > ENGLISH ONLY GUIDES PRINT Polar variations with frequency Whether particular frequency components add or subtract in the far field will depend on the loudspeaker system spacing, the angular offset of the listener with respect to the centre line, and the wavelength. The following polar responses show what happens when subwoofers are placed 8. 6m apart and are driven in unison at various frequencies: 100Hz The polar plot shows the far field polar response of the two subwoofers when driven in phase with the same 100Hz signal. Subwoofer interaction causes irregular coverage either side of the centre line. Response nulls (cancellations) occur at the sides because the spacing is an odd number of half-wavelengths causing this frequency component to cancel in the far field. 80Hz The above shows the same system at 80Hz. Subject to change without notice. CONTENTS < > ENGLISH ONLY GUIDES PRINT All material © 2007. Subject to change without notice. CONTENTS < > ENGLISH ONLY GUIDES PRINT Section 5 Application Guide Wavefront W8L Series Line Arrays W8L, W8LC & W8LM plus W8LS and WLX Sub-woofers Simply need controller and amplifier rack information?Skip to sections 5. 10, 5. 11 & 5. 12 5. 1 5. 2 5. 3 5. 4 5. 5 5. 6 5. 7 5. 8 5. 9 5. 10 5. 11 5. 12 Introduction Specifications, outline drawings and performance plots Classic line array behavior How many do I need?ViewPointtm 3. 03 and System control Horizontal considerations Sub-woofers and Front Fills Climatic effects Delay Systems W8L Quick Start Guide W8LC Quick Start Guide W8LM Quick Start Guide General information W8L Series Applications Guide Version 2 Copyright by Martin Audio Ltd 2004; all rights reserved. Martin Audio Ltd, Century Point, Halifax Road, Cressex Business Park, High Wycombe, Buckinghamshire. The information presented in this document is, to the best of our knowledge, correct. Martin Audio Limited will not, however, be held responsible for the consequences of any errors or omissions. Technical specifications, weights and dimensions should always be confirmed with Martin Audio Limited before inclusion in any additional documentation. In our efforts to develop and improve our products we reserve the right to change the technical specification of our products without notice. Martin Audio Limited tries, whenever possible, to minimise the effects of product changes on equipment compatibility. 19th February 2004 All material © 2007. [. . . ] W8S' High (standing upright) 2 3 4 Vertical coverage 80Hz Wide Wide 80º 40Hz Wide Wide Wide 160Hz 80º 53º 40º Use tall stacks for long shots. Useful for long distances in low-roofed venues with raked seating up to the height of the stack. (Important: see safety note above) Use short stacks for short, wide vertical shots. Vertical Boundary effects A solid floor will act as a reflector. [. . . ]