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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 4116-7 <br />d.Analog NTSC Video Signal to Noise Ratio: at least 65 dB. <br />e.Analog RGBHV Video Signal to Noise Ratio: at least 58 dB. <br />f.Analog Video Differential Phase and Gain: no more than 0.5 degrees and 0.5 <br />percent, respectively. <br />g.Analog and Digital Video Signal to Crosstalk Ratio: at least 50 dB. <br />h.Analog Video Timing; no more than .25 degrees variation at 3.58 MHz <br />between any two parallel lines to the same location. <br />3.Projection Systems: <br />a.Consistent with performance of specified projectors and screens. <br />b.Brightness, convergence per ANSI standard procedures for device. <br />B.System Gain/Levels <br />1.Maintain consistent signal levels throughout the Project for each type of signal <br />carried. Patch points shall be unity gain, "flat" equalization, unless specifically noted <br />otherwise herein or on the drawings. The reference signal levels shall be; <br />a.Analog Video; 1.0 Volt peak to peak composite signal, sync tip to peak white, <br />defined as "100 IRE", or "100% signal". <br />b.TV RF; 1000 microVolts, defined as "0 dBmV" <br />c.Digital Audio, Line Level; -20 dbfs, defined as "0 VU" <br />d.Analog Audio, Line Level; +4 dBu, defined as "0 VU" <br />e.Analog Audio, Microphone Level; -50 dBm, 150 ohms <br />f.Analog Audio, Speaker Level; Greater than +20 dBm <br />g.Data and Control; As defined by the specification for the signal carried, e.g., <br />RS-232, RS-422 or any other such appropriate standard. <br />C.Masking <br />1.Masking sound level, following Contractor's level and signal equalization <br />1/3 Octave Band Sound Pressure Level and <br />maximum permitted <br />variance (dB) below ceiling <br />tile <br />50 Hz:47.0 (+4/-6) dB <br />63 Hz:47.0 (+4/-5) dB <br />80 Hz:47.0 (± 4) dB <br />100 Hz:47.0 (± 3) dB <br />125 Hz:47.0 (± 3) dB <br />160 Hz:46.0 (± 3) dB <br />200 Hz:45.0 (± 2) dB <br />250 Hz:44.0 (± 2) dB <br />315 Hz:42.7 (± 2) dB <br />400 Hz:41.3 (± 2) dB <br />500 Hz:40.0 (± 2) dB <br />630 Hz:38.3 (± 2) dB <br />800 Hz:36.7 (± 2) dB <br />1000 Hz:35.0 (± 2) dB <br />1250 Hz:33.3 (± 2) dB <br />1600 Hz:31.7 (± 2) dB <br />2000 Hz:30.0 (± 2) dB <br />2500 Hz:28.3 (± 2) dB