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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 4116-11 <br />3)depth: 2.06 ” <br />h.Net Weight 15 lbs <br />4.Manufacturers: <br />a.Innovox <br />b.Cambridge Sound <br />c.JBL <br />d.Or equal <br />2.2 GENERAL POWER AMPLIFIERS AND RELATED <br />A.Power Amplifiers, General <br />1.Drawing Symbol: PA[number]. <br />2.Provide the following functions and/or features <br />a.Employ solid state devices (integrated circuits and/or transistors) throughout <br />and employ positive protection of circuit components. <br />b.With amplifier input driven 10 dB beyond input level required to produce full <br />rated output, amplifier shall withstand for at least 15 seconds any of the <br />following load conditions without instability or operation of main over current <br />protection (i.e. no blown fuses or circuit breakers). <br />1)"Short" circuit of 0.1 ohm. <br />2)Open circuit (no load). <br />3)Standard Reactive Load: 5.4 ohms in series with the parallel <br />combination of 12.5 microhenrys; 800 microfarads and 18.3 ohms <br />resistive. <br />c.Peak voltage of turn-on and/or turn-off transients not greater than 20 dB <br />below maximum rated amplifier output. <br />1)Time duration of transients not to exceed 3 seconds. <br />d.Input level controls for each output channel to be calibrated, stepped <br />attenuators with at least 50 dB range. <br />1)For 0 to 34 dB of attenuation, steps not to be greater than 2.0 dB. <br />2)Attenuators to track calibration within 0.5 dB. <br />3)Stepped attenuators are not required at Power Amplifiers where the <br />connected driving source device includes a precision attenuator <br />under digital control with precision not less than that specified herein. <br />e.Input Connectors: XLR connector or tip sleeve (standard) phone jack or <br />barrier strip. <br />f.Output Connectors: Standard 0.75 inch spacing "5-way" binding posts, or <br />barrier strip. <br />g.Where integral cooling fans are provided, such fans shall have a minimum <br />life rating of 50,000 hours at 25 degree Centigrade ambient temperature. <br />h.Where indicated, provide balanced input, differential or transformer. Provide <br />matching accessory to implement if not a standard feature of the product <br />provided. <br />i.Listed by a Nationally Recognized Testing Laboratory. <br />3.Minimum performance requirements with all channels driven <br />a.Power Output Per Channel: As scheduled on Drawings as Minimum <br />Amplifier (Min Amp) and specified below; continuous average sine wave <br />power into 70 Volt line over a bandwidth of 40 Hz to 20 kHz. <br />1)Frequency Response: plus 0 dB, minus 0.5 dB, 40 Hz to 20 kHz at <br />rated output. <br />2)Total Harmonic Distortion: Less than 0.25 percent at rated output, <br />40 Hz to 20 kHz. <br />3)Intermodulation Distortion: Less than 0.04 percent at rated output <br />using frequencies of 60 Hz and 7 kHz, mixed in a ratio of 4:1.