L-Acoustics ARCS Operator's Manual

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L-Acoustics ARCS Operator's Manual Manual pdf 50 page image

L-ACOUSTICS ARCS Manual V2.0 13-02-03 49b) LF ServiceThe 15'' loudspeaker cone assembly is not field-serviceable. For field service, the damaged 15"loudspeaker should be removed and replaced. To remove the front grille, lift the edges of the acousticfoam and remove the screws. Screws can be found where the edges of the foam are not glued to thegrille - there is no need to completely remove the acoustic foam in order to remove the loudspeakergrille.The damaged loudspeaker should be returned to your distributor or directly to the factory forwarranty examination and reconing.c) Polarity CheckWhenever a HF diaphragm or 15'' loudspeaker is replaced, wiring polarity should be checked with apolarity checking device. Both LF and HF components should operate with positive polarity.d) Periodic CheckThe frequency response of the enclosure should be checked periodically to check for any deviationsdue to wear, shock or other damage. This should be done on an annual basis for systems notsubjected to demanding use. For systems being used on a daily basis for sub hire or touring,enclosures should be checked every month (or even more frequently).A frequency response check can be performed with a high resolution RTA (real time analyzer), orpreferably using WINMLS, SMAART, SPECTRAFOO, TEF or MLSSA measurement systems. Refer tothe on-axis amplitude/frequency response in order to determine if the response of your ARCSenclosure is within specification. In addition, a response sweep using a sine wave generator is usefulfor checking for coil rubs, buzzes, air leaks or other undesirable mechanical vibrations as part of theperiodic quality control procedure.The mechanical attachment of both low frequency and high frequency loudspeakers should bechecked periodically since screws can become loose after being submitted to intense, long durationmechanical vibrations. Similarly, it is a good idea to periodically check that the high frequency diagramand rear cover for the compression driver are solidly attached. The quality of the contacts and lockingaction of the Speakon connector should also be checked periodically.6.2 SPARE PARTSHP BC21 1.4î driver (8 ohms)HS BC21 Diaphragm for 1,4" driverHP PH153 15" speaker (8 ohms)HS PH153 15" recone kitHR PH153 15" recone kit including labourCM ARCS Front foamMC ARCSGRL Front grillCD COLNEO Neoprene glue 500ML

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