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City of Santa Ana Public Library Renovation <br />Group 4 Architecture Research + Planning, Inc.Smith, Fause & McDonald Inc. <br />Group 4 Project No. 22575-01 Conform Set – August 2, 2024Bid Set Addendum-03 – June 05 <br />INTEGRATED AUDIOVISUAL SYSTEMS AND EQUIPMENT SECTION 27 4116-71 <br />b.Maximum output. <br />c.Input clipping level. <br />d.Frequency response. <br />e.Total harmonic distortion. <br />f.Signal to noise ration. <br />g.Signal to crosstalk ratio. <br />6.Electro/Acoustic Tests: <br />a.Uniformity of coverage. <br />b.Electronic and acoustic frequency response/one-third octave equalization. <br />Measure at ear level. Comply with applicable portions of ANSI (SMPTE) <br />PH22.202M-1984, "B chain electro-acoustic response - control rooms and <br />indoor theaters." Adjust to "curve X of B chain characteristic". City's <br />Representative will direct final adjustment. <br />c.Maximum continuous sound pressure level (in the reverberant field). Drive <br />systems with broadband pink noise. Sustain for at least five (5) minutes with <br />no system damage. Measure for "A" and "C" weightings at ear level on <br />loudspeaker axis. Turn off noise. <br />d.Acoustic signal-to-noise ratio referenced to the specified maximum <br />continuous sound pressure level in the reverberant field. Measure for "A" <br />and "C" weightings at ear level on loudspeaker axis with mechanical systems <br />operating. Present comparison with previous measurement. <br />7.Video Systems: <br />a.Picture Monitors: <br />1)Apply crosshatch. Verify linearity. <br />2)Apply red field. Adjust purity. <br />3)Apply SMPTE bars and PLUGE. Adjust to standards. <br />b.Video Path Test: Use NTC Report No. 7 procedures. Use full field or line <br />signals. <br />1)Insertion Gain. <br />2)Gain/Frequency Distortion. <br />8.Control System: Demonstrate complete operation. <br />3.16 LABELING <br />A.Conform with the requirements of Section 27 0553 – Identification for Communications <br />Systems. <br />B.Provide permanent "wedge" type labels on all controls, as applies, to indicate correct settings <br />after systems performance testing and adjustment procedures have been successfully <br />completed. <br />END OF SECTION