User manual MARTIN AUDIO W8VDQ

[. . . ] Please take some time to review the following points concerning safe use of W8VDQ loudspeaker systems. Professional loudspeakers are capable of producing extremely high sound levels and should be used with care. [. . . ] The easiest way to set the tilt angle for maximum rear audience level is to aim the top section of the grille straight towards the furthest seat. See Maximum level to farfield line below. . . Note that the W8VDQ's differential dispersion does not allow vertical arraying or stacking. The Martin Audio W8LM line array system provides optimal vertical coupling for vertical array applications. Horizontal arraying (up to 60-100deg between W8VDQs) is possible. 5 Amplification & Control Choosing a power amplifier Martin Audio loudspeakers are capable of recreating musical dynamics accurately and with incredible impact if powered correctly. Martin Audio loudspeaker power ratings are quoted for AES power - a longterm average power rating, and Peak power ­ a short-term burst capability. Moving coil loudspeakers can be run up to their AES power rating continuously and up to the higher Peak power rating for transient musical peaks. 1) 2) 3) Choose an amplifier with a power capability approaching 3200W into 6ohms. This means choosing a Martin Audio MA9. 6 or MA12K power amplifier. For spectral balance, set your amplifiers to the same voltage gain throughout the system. A common industry standard voltage gain is 32dB (x40). All Martin Audio limiters are set for this level. If you use Crown amplifiers without a 32dB setting, set them to their 26dB (x20) standard and increase the recommended limiter thresholds by 6dB ­ making sure you double-check the amplifier gain setting before running the system at high level. Always check the amplifier gain settings ­ these are usually on the rear panel. Avoid using sensitivity settings as these give different gains depending on the amplifier's power specification. 4) All material © 2008. [. . . ] Subject to change without notice. 7 Cable lengths When connecting W8VDQ systems to an amplifier, it is recommended that the return resistance of the cable used is less than one tenth of the nominal impedance of the system or systems in parallel. The table below gives an indication of the maximum permissible cable runs for various conductor cross-sectional areas. 8 Warranty Martin Audio ceiling loudspeaker products are warranted against manufacturing defects in materials or craftsmanship over a period of 5 years from the date of original purchase. [. . . ]