University Center AV Integration Construction Documents February 8, 2012

Transcription

1 SECTION AUDIOVISUAL GENERAL REQUIREMENTS PART 1 GENERAL 1.01 SUMMARY A. This Section provides supplemental information to Division 27 Specification Section Basic Communications Requirements. B. Provide all labor, materials, equipment, tools and services required for the installation of the Audiovisual Systems RELATED SECTIONS A. Division 27 Specification Section Common Work Sleeves, Penetrations and Firestopping. Provide sleeves, penetrations, and firestopping as required to support the work of this Section. B. Division 27 Specification Section Common Work Hangers and Supports. Provide hangers and supports as required to support the work of this Section SUBMITTALS A. Provide the following per the criteria set forth for Submittals in Division 27 Specification Section Basic Communications Requirements: 1. Product Data 2. Shop Drawings 1.04 RECORD DOCUMENTS A. Provide Record Documents per the criteria set forth for Record Documents in Division 27 Specification Section Basic Communications Requirements OPERATION AND MAINTENANCE MANUALS A. Provide Operation and Maintenance Manuals per the criteria set forth for Operation and Maintenance Manuals in Division 27 Specification Section Basic Communications Requirements. PART 2 MATERIALS 2.01 THIS SECTION NOT USED PART 3 EXECUTION 3.01 GENERAL A. Work shall comply with the Governing Requirements as defined in Division 27 Specification Section Basic Communications Requirements. Governing Requirements of particular relevance to this Section include, but are not limited to: 1. IEEE C62.41: Recommended Practice for Surge Voltages in Low Voltage AC Power Circuits 2. UL 1449: Transient Voltage Surge Suppressors 3.02 SOFTWARE IMPLEMENTATION AUDIOVISUAL GENERAL REQUIREMENTS

2 A. The Contractor shall provide all software implementation as required to provide a fully functional and operating system ready for the Owner s use. Software implementation shall include but not be limited to programming, configuration, modification, integration of other systems, integration of exist systems, data entry and installation. Existing Audiovisual Systems shall be incorporated into new/expansion systems, as required HARDWARE CONFIGURATION A. The Contractor shall provide all hardware configurations as required to provide a fully functional and operating system ready for the Owner s use. Hardware configuration shall include but not be limited to firmware configuration, data communication, system settings, power distribution and installation. Existing Audiovisual Systems shall be incorporated into new/expansion systems, as required INSTALLATION A. Pathways: Prior to installation of Audiovisual cabling, Contractor shall verify conduit sizing and quantity for correctness. Deviations from design documents shall be documented and Contractor shall contact Engineer with notification of deviation. B. Cabling: 1. Circuits shall be physically separated by metal raceway or by a minimum distance of six inches when metal raceway is not applicable. Circuit separation shall be based upon signal level: i. Audio circuits 20dBm or less Microphone signal ii. Audio circuits 20dBm thru +20dBm Line level audio iii. Audio circuits +20 or above Loudspeaker signal iv. Video circuits: 1 volt v. Computer data circuits: 1 volt vi. Direct current power circuits: 1 24 volts 2. Cable pulls shall be conducted within the following requirements: i. Manufacturer s guidelines for pulling tension and bend radii. ii. Circuit separation. iii. NEC conduit fill standards. The Contractor shall notify Engineer prior to cable installation when the conduits are found to be undersized. iv. Any cable found to be faulty due to poor cable pull practices shall be removed and replaced at no additional cost to Owner. 3. Cable splicing shall not be considered a common installation practice. If necessary, splice cables only in junction boxes or racks. Shielded cables shall not be spliced; instead each end shall be terminated with an appropriate connector to maintain shield continuity. Any cable found to be faulty due to splicing shall be removed and replaced at no additional cost to Owner. 4. The Contractor shall dress all cables at both ends with: i. Black heat shrink where jacketing has been stripped away to expose the individual conductors ii. Clear heat shrink around the exposed shield conductor (Coax excluded) iii. Printed, adhesive labels with clear heat shrink over each label 5. Contractor shall make all terminations with rosin core solder, crimp/compression type connectors or captive screw type mechanical connections. For captive screw type AUDIOVISUAL GENERAL REQUIREMENTS

3 C. Equipment: mechanical connection, use spade type or ferrule type crimp connections. Bare wire terminations are not acceptable. 1. Equipment shall be installed as indicated and specified, and in accordance with the manufacture s recommendations, except where local codes or regulations take precedence. 2. Place equipment labels or other identification where the label or identification can be easily seen and read without difficulty. 3. Equipment shall be installed level, plumb, parallel, and perpendicular to building structures and to other building systems and components, except where otherwise indicated. 4. Equipment shall be securely fastened. Select fasteners and supports so that the load applied to any one fastener maintains a minimum load factor of five. 5. Equipment locations: Prior to installation of Audiovisual equipment, Contractor shall coordinate with other trades and subsequently verify all equipment locations that mount on walls or within ceilings. This shall include but not be limited to: i. Structural elements such as lighting devices, HVAC equipment, fire protection devices, and cable tray ii. Structural support elements for ceiling mounted devices iii. Backing Board for wall mounted devices 6. Prior to head end equipment installation, contractor shall verify equipment rooms are free of airborne contaminants. 7. After head end equipment installation, contractor shall protect equipment from any future construction work that could cause damage to equipment, i.e. masonry, wood, paint, plumbing, etc. 8. Prior to furniture work, Contractor shall coordinate with other trades and subsequently verify all equipment locations that mount within furniture, 9. Contractor shall coordinate with architect as to any equipment color and finish requirements. D. Grounding: 1. Contractor shall follow accepted engineering practices when installing the Audiovisual grounding system. The Audiovisual grounding system installation shall conform to NEC. The Contractor shall be responsible for correcting any signal grounding problems within the Audiovisual system (not Division 16 grounds) including but not limited to electromagnetic/electrostatic hums, ground loop anomalies, and distortions. 2. A grounding buss bar shall be installed in each equipment rack. The copper buss bar shall be sized to accommodate all connections plus future expansion. i. An insulated copper conductor properly sized shall bond the equipment rack buss bar to the dedicated ground conductor provided by Division 16. ii. A Star Type grounding network shall be established within the equipment rack. All Audiovisual components shall be grounded to this buss bar. Ground all components according to the following methods: 1) Equipment having a power cord without a grounding conductor connected to chassis: furnish and install 14 AWG grounding conductor from component s metallic chassis to grounding buss bar within rack. 2) Equipment having a power cord with grounding conductor connected to chassis: do not install an additional grounding conductor. 3) Physically isolate all rack mounted equipment from racks with isolation washers. AUDIOVISUAL GENERAL REQUIREMENTS

4 3. Shielded audio signal cables shall have the shields terminated at one end only. The non terminated shield conductor shall be trimmed to a length of 1/4 inch, folded back against the cable jacketing and covered with black heat shrink. 4. All ungrounded equipment, such as microphones, shall have the shielding terminated at both ends with only one end connected to ground. 5. All Video and Data shielded cables shall have the shielded conductors terminated on both ends. E. Structural Installations 1. Structural support elements: i. Structural support elements are defined as those materials added to structure for the reinforcement of general construction methods to meet a designed minimum load factor of five. These include but are not limited to: 1) Backing boards required for the support of Audiovisual equipment or cabling 2) Strut supports hung from structural beams or concrete slab ii. iii. iv. The Contractor shall provide all Audiovisual mounting and rigging equipment that fasten to the structural support elements. All support elements and fastenings shall be able to support a minimum load factor of five times the total assembled weight. The Contractor shall be responsible for the complete and correct installation of all the Audiovisual equipment TESTING 2. Hard Ceiling Loudspeaker Locations: i. Hard ceiling loudspeaker locations requiring trim rings, rough in brackets loudspeaker back boxes shall be installed during conduit installation. ii. The Contractor shall install the trim rings, rough in brackets and back boxes for hard ceiling locations in a timely manner, not to conflict with scheduled work of other trades. In the event that this equipment is not installed in a timely manner, the Contractor shall be responsible for all retrofit work and materials to provide a full functioning speaker assembly. iii. It is the Contractors responsibility to coordinate installation with other trades. A. Performance Standards 1. Audio i. Electrical Requirements 1) Frequency response: 20 Hz 20KHz at ±1.0 db 2) Total harmonic distortion + noise: 20 Hz 20KHz at ±1.0 percent db 3) Signal to noise ratio with crosstalk: minimum 55dB at 20 Hz 20 KHz ii. Acoustical Requirements 1) Sound pressure levels shall evenly cover the audience area without audible distortions, hums, noise, rattles or buzzes. a) Nominal program material: 85 db at ±2.0 db with a minimum of 10 db above ambient noise. AUDIOVISUAL GENERAL REQUIREMENTS

5 b) Nominal speech material: 85 db at ±2.0 db with a minimum of 10 db above ambient noise. c) Maximum sound pressure level: 100 db at ±2.0 db d) Contractor shall make final loudspeaker sound pressure level adjustments according to Owner s recommendations determined during acceptance testing. 2. Video 2) Frequency Response: a) Speech reinforcement: uniform response from 125 Hz 2 KHz at ± 2 db. Below 125Hz, roll off 6 db/octave. Above 2 KHz, roll off 3 db/octave. b) Program reinforcement: uniform response from 63Hz 2.5 KHz ± 2 db. Below 63 Hz, roll off appropriate to loudspeaker specification. Above 2.5 KHz, roll off 3 db/octave. i. Electrical Requirements 1) Signal strength: minimum 70 I.R.E. with 100 percent SMPTE white reference level. 2) Signal to noise ratio: minimum 55dB at 0 Hz 4.2 MHz 3) Crosstalk: minimum 45dB at 0 Hz 4.2 MHz 4) Frequency response: : ±0.5 db at 0 Hz 4.2 MHz 5) Line and field tilt: 2 percent maximum 6) Differential gain: 3 percent maximum 7) Differential phase: 2 degrees maximum 8) Sync: 50 Jseconds maximum ii. Optical B. Operational Testing 1) The projection system including projection screen, projector and mirrors shall be securely installed. No physical movement or vibration in projection system shall be acceptable. 2) Projector light levels: ±15 percent output in lumens of projector specifications 3) Projector light coverage: ±20 percent uniform light coverage within all areas of projection screen. 1. Prior to system training and acceptance testing, the Contractor shall perform and document operational testing. 2. Contractor shall assemble the following test equipment: i. Ground fault indicator ii. Digital Multi meter iii. Load resistors: 1) Microphone load: 150 ohm, shielded, terminating resistors 2) Line load: 600 ohm, shielded, terminating resistors 3) Loudspeaker load: varies, match impedance measurements within 10 percent iv. Sine Wave Generator: 1) Continuously variable from 20Hz 20kHz with level accuracy of 0.5dBu 2) Level Range: 35 dbu to 26 dbu. AUDIOVISUAL GENERAL REQUIREMENTS

6 3) Total Harmonic Distortion: 0.01 percent v. Pink Noise Generator 1) Noise frequency: 20Hz 20kHz, 1/3 octave band filtered 2) Level Range: 35 dbu to 26 dbu. 3) Total Harmonic Distortion: 0.01 percent vi. Sound level meter meeting ANSI S1.4 specifications vii. Polarity tester viii. Impedance meter: Accuracy, 1 ohm 8000 ohms, ±10 percent, 20Hz 20kHz ix. Oscilloscope: minimum of 20 MHZ bandwidth x. Real time spectrum or fast fourier transform analyzer: 1) Filters: ANSI compliant with 1/3 octave band filtering 2) Frequency range: 20Hz to 22Khz 3) Frequency accuracy: ± 0.5 db, 20 Hz to 22kHz 4) Level range: 25 db to 140 db 5) Level accuracy: ± 0.1 db xi. Distortion analyzer: THD minimum 0.02 percent with accuracy of 5 percent of reading. xii. Video generator: SMTPE color bar, multi burst, and full white patterns xiii. Light meter: measurements in foot candles and lux. Accuracy: 3 percent. xiv. Waveform monitor xv. Vectorscope 3. Nominal test signals: i. Level 1) Microphone level: 50dBu 2) Unbalanced line level: 10dBV 3) Balanced line level: +4dBu ii. Frequency: 1) Full range frequency loudspeaker networks: 1000Hz sine wave 2) Crossover loudspeaker networks: apply a sine wave with a frequency centered within the frequency band of the signal path 4. Field Measurements: i. Prior to any connections being made to building power, Contractor shall use a ground fault indicator to verify the circuits provided have proper ground wiring. Notify Owner upon discovery of any faulty wiring. In no way is Contractor to perform any work on any faulty electrical wiring discovered. ii. Contractor shall produce a checklist for the testing and documentation of all Audiovisual equipment. Each device shall be verified for proper operation. iii. Contractor shall correct any defects upon discovery. Contractor shall notify and coordinate with other trades to ensure all defects (including those by other trades that affect the Audiovisual system) are corrected and put into working order. iv. Impedance testing: Measure and document impedance level of each loudspeaker cable entering equipment rack. 1) Full range frequency networks: measure impedance at 1000Hz. AUDIOVISUAL GENERAL REQUIREMENTS

7 2) Crossover networks: measure impedance at center frequency for frequency band of loudspeaker network 5. Audio System Measurements i. The following procedures are the minimum requirements for this testing section. These procedures are guidelines only; refer to listed reference material for testing criteria. Manufacturer s recommendations for operation and connectivity of specific test equipment shall be observed for all testing procedures. Perform all applicable procedures and document results. ii. Hum and noise testing: verify system is free of any hums, noises, buzzes, oscillations, or any other anomalies contributing to poor system operation. Correct any defects upon discovery. iii. System Gain Structure 1) The system gain structure shall be configured in such a way as to maximize dynamic range and provide a uniform clipping level across the entire audio system. i. Pat Brown, System Gain Structure, Handbook for Sound Engineers 3 rd Ed., Glen Ballou, editor. (Focal Press, Boston, 2002). ii. John Murray, Sound System Gain Structure (ProSonic Solutions, Woodland Park, CO). 2) Contractor shall incorporate signal attenuation and gain devices as necessary to achieve proper system gain structure. 3) Procedure: a) Set signal path gains to a minimum while still passing signal. b) Set signal path processing equipment except bandpass filters to bypass. c) Set signal path volume attenuators to minimum attenuation. d) Connect a signal generator to the input of the signal path Set the signal generator to a nominal frequency and level for the signal path Set the input gain stage of the signal path under test to a nominal operating level (0 db VU or 18 dbfs). e) Connect an oscilloscope to the final output of the signal path Terminate the output with a load resistor appropriate for the signal path f) Adjust the signal generator level to a maximum level just below clipping as measured on the oscilloscope. g) Set all gain stages in the signal path to a maximum level just below clipping as measured on the oscilloscope. h) Perform this procedure for all signal paths in the audio system. 4) Documentation: a) Document the final level of the signal path under test as measured on the oscilloscope for the signal path s final settings. b) Document the signal generator s output level. iv. Amplifier Gain Structure 1) The amplifier gain structure shall be configured in such a way as to provide full amplifier gain at a maximum system input signal level just before clipping. AUDIOVISUAL GENERAL REQUIREMENTS

8 i. Pat Brown, System Gain Structure, Handbook for Sound Engineers 3 rd Ed., Glen Ballou, editor. (Focal Press, Boston, 2002). ii. John Murray, Sound System Gain Structure (ProSonic Solutions, Woodland Park, CO). a) Set signal path processing equipment except bandpass filters to bypass. b) Set signal path volume attenuators to minimum attenuation. c) Set the amplifier input attenuator of signal path under test to maximum attenuation. d) Connect a pink noise generator to the input of the signal path Set the signal generator to a maximum system signal level just before clipping for the signal path e) Terminate the loudspeaker network to the amplifier output of the signal path f) Position a sound pressure level meter measurement microphone on axis with the loudspeaker g) Adjust the amplifier input attenuation of the loudspeaker network under test until one of the following conditions is reached: v. Signal to Noise i. Amplifier maximum output level: the point at which the amplifier output signal begins to clip. Increase the amplifier input attenuation to achieve an output level just below signal clipping. ii. Loudspeaker maximum sound pressure level: the point at which further decrease of input attenuation has negligible effect upon the loudspeaker s sound pressure levels. Increase the amplifier input attenuation to achieve the loudspeaker s maximum sound pressure level. iii. Acoustic maximum sound pressure level: the point at which the loudspeaker sound pressure level measures the specified maximum sound pressure level as defined in the performance standards. a) Document the amplifier input attenuation settings for the signal path b) Document the sound pressure level of the loudspeaker 1) The signal to noise testing shall be conducted to determine the amount of noise present in the audio system referenced to a nominal operating input signal. i. Bob Metzler, Tools and Techniques, Audio Measurement Handbook (Audio Precision Inc., Beaverton, OR, 1993). ii. Dennis Bohn, RaneNote 145, Audio Specification (Rane Corporation, Mukileto, WA). AUDIOVISUAL GENERAL REQUIREMENTS

9 a) Set signal path processing equipment except bandpass filters to bypass. b) Set signal path volume attenuators to minimum attenuation. c) Connect a volt meter to the output of the signal path Terminate the output with a load resistor appropriate for the signal path d) Connect a signal generator to the input of the signal path Set the signal generator to a nominal frequency and level for the signal path e) Replace signal generator with load resistor appropriate for signal path a) Document the level as measured on the volt meter with the signal generator connected to the input of signal path b) Document the level as measured on the volt meter with a load resistor connected to input of the signal path vi. Frequency Response 1) The frequency response testing shall be conducted to determine the bandwidth of the audio system. i. Bob Metzler, Tools and Techniques, Audio Measurement Handbook (Audio Precision Inc., Beaverton, OR, 1993). ii. Dennis Bohn, RaneNote 145, Audio Specification (Rane Corporation, Mukileto, WA). a) Set signal path processing equipment except bandpass filters to bypass. b) Set signal path volume attenuators to minimum attenuation. c) Connect a signal generator to the input of the signal path Set the signal generator to a nominal frequency and level for the signal path d) Connect a volt meter to the output of the signal path Terminate the output with a load resistor appropriate for the signal path Calibrate the volt meter to 0 volts. e) Sweep the signal generator frequency from 20Hz to 20kHz. f) Perform this procedure for all signal paths in the audio system. a) Document all frequencies that deviate from the performance standards. vii. Total Harmonic Distortion + Noise 1) The total harmonic distortion testing shall be conducted to determine the linearity of the audio system. i. Bob Metzler, Tools and Techniques, Audio Measurement Handbook (Audio Precision Inc., Beaverton, OR, 1993). AUDIOVISUAL GENERAL REQUIREMENTS

10 ii. Dennis Bohn, RaneNote 145, Audio Specification (Rane Corporation, Mukileto, WA). a) Set signal path processing equipment except bandpass filters to bypass. b) Set signal path volume attenuators to minimum attenuation. c) Connect an oscilloscope to the output of the signal path Terminate the output with a load resistor appropriate for signal path d) Connect a signal generator to the input of the signal path Set the signal generator to a nominal frequency for the signal path under test. Set the signal generator to a maximum level just before clipping for the signal path under test as measured on the oscilloscope. e) Remove the oscilloscope and connect a distortion analyzer to the output of the signal path f) Perform this procedure for all signal paths in the audio system. 6. Acoustic Measurements a) Document the distortion readings as measured on the distortion analyzer for each signal path. i. The following procedures are the minimum requirements for this testing section. These procedures are guidelines only; refer to listed reference material for testing criteria. Manufacturer s recommendations for operation and connectivity of specific test equipment shall be observed for all testing procedures. Perform all applicable procedures and document results. ii. iii. Perform testing procedures as applicable for the audio system Hum and noise testing: verify the system is free of any hums, noises, buzzes, oscillations, or any other anomalies contributing to poor system operation. Correct any defects upon discovery. Contractor shall notify and coordinate with other trades to suppress any structural vibrations and noises cause by audio system. iv. Polarity 1) Polarity testing shall be conducted to determine the phase discrepancies within the sound system cabling. i. Bob Metzler, Tools and Techniques, Audio Measurement Handbook (Audio Precision Inc., Beaverton, OR, 1993). ii. Gary Davis and Ralph Jones, Sound System Test Equipment, Yamaha Sound Reinforcement Handbook, 2 nd Ed. (Hal Leonard Publishing Corporation, Milwaukee, WI, 1989). a) Set signal path processing equipment except bandpass filters to bypass. b) Set signal path volume attenuators to minimum attenuation. c) Connect the polarity test equipment to the signal path input d) Measure polarity on axis to the loudspeaker e) Correct any deficiencies upon discovery. f) Perform this procedure for all signal paths in audio system. AUDIOVISUAL GENERAL REQUIREMENTS

11 v. Loudspeaker Frequency Response 1) The frequency response of the loudspeakers shall be configured utilizing the audio system equalizers to provide an acoustic frequency response as defined within the Performance Standards section. i. Chris Foreman, Sound System Design, Handbook for Sound Engineers 3 rd Ed., Glen Ballou, editor. (Focal Press, Boston, 2002). ii. John Murray, Sound System Equalization (ProSonic Solutions, Woodland Park, CO). a) Set signal path processing equipment except bandpass filters and system equalization to bypass. b) Set signal path volume attenuators to minimum attenuation. c) Connect a pink noise generator to the input of the signal path Set the pink noise generator to a nominal level for signal path d) Position the measurement microphone at an optimal testing position for loudspeaker e) Utilize a real time spectrum or fast fourier transform analyzer to measure the frequency response of the loudspeaker f) Frequency Response Settings: i. Loudspeaker bandpass frequencies: set the bandpass filters to achieve frequency response as specified in the performance standards. ii. Loudspeaker equalization: set equalization to achieve frequency response as specified in the performance standards. g) Perform this procedure for all loudspeaker networks in audio system. a) Document the frequency response for all loudspeaker networks. vi. Loudspeaker Coverage 1) The audio system shall be configured to provide uniform sound pressure levels within the audience areas. i. Chris Foreman, Sound System Design, Handbook for Sound Engineers 3 rd Ed., Glen Ballou, editor. (Focal Press, Boston, 2002). a) Connect a pink noise generator to a system input. Set the pink noise generator to a nominal level for the signal path b) Utilize a sound pressure level meter to measure the uniformity of the loudspeaker coverage of the audience areas at listening heights. AUDIOVISUAL GENERAL REQUIREMENTS

12 c) Correct any deficiencies in the loudspeaker coverage that deviate from that specified in the performance standards. 7. Video System Measurements a) Document deviations from that specified in the performance standards. i. The following procedures are the minimum requirements for this testing section. These procedures are guidelines only; refer to listed reference material for testing criteria. Manufacturer s recommendations for operation and connectivity of specific test equipment shall be observed for all testing procedures. Perform all applicable procedures and document results. ii. Test all video signal paths with field connection points, field cabling and video equipment in place. 1) Multi conductor cabling: a) Test all the conductors in the same manner as a single composite conductor. b) Document the worst performing conductor of the multi conductor cable. Performance of the remaining conductors shall be assumed to exceed performance of documented conductor. iii. iv. Noise and distortion testing: During the following procedures, verify system is free of any visual noises, oscillations, ground loop distortion or any other anomalies contributing to poor system operation. Correct any defects upon discovery. Insertion Gain 1) The insertion gain test shall be performed to verify the amplitude continuity of the video signal path. i. Tektronix, Waveform Monitor Techniques, The Basics, NTSC Video Measurement (Tektronix Inc., Richardson TX). a) Connect a video generator to the input of the signal path b) Apply the SMTPE color bar test pattern. c) Connect a waveform monitor to the output of the signal path d) Perform this procedure for all signal paths in video system. a) Document the following as measured of the waveform monitor. v. Frequency Response i. White level. ii. Black levels. iii. Blanking levels. iv. Sync levels. v. Sync pulse. AUDIOVISUAL GENERAL REQUIREMENTS

13 C. Acceptance Testing 1) The frequency response test shall be performed to verify the uniform amplitude response as a function of frequency. i. Tektronix, Waveform Monitor Techniques, The Basics, NTSC Video Measurement (Tektronix Inc., Richardson TX). a) Connect a video generator to the input of the signal path b) Apply the multi burst test pattern. c) Connect a waveform monitor to the output of the signal path d) Perform this procedure for all signal paths in the video system. a) Document the amplitude level of each frequency burst packet. 1. System acceptance testing shall not be conducted until all final as built drawings, manuals and operational testing have been completed and the documentation has been submitted for Engineer s review. 2. Acceptance testing shall be conducted with Contractor, Engineer, and Owner in attendance. 3. Contractor shall demonstrate that all components of the Audiovisual Systems are in proper working order and are in accordance with specifications. 4. At time of acceptance testing, all items found to be outside of specification requirements; Owner requirements, code requirements or general installation practices shall be added as new items to the final Punch List. All items found outside of specification requirements shall be put into working order prior to final acceptance of system. 5. The Contractor shall assemble an inventory of installed equipment. This inventory shall be complied at time of acceptance testing and compared to equipment listed in contractual documents. 6. Acceptance testing may be suspended by Engineer if Audiovisual Systems are not complete and operable, equipment failure occurs, or installation is not in accordance with specifications. Contractor shall be responsible for any cost incurred by Engineer for additional site visits required to complete acceptance testing. END OF SECTION AUDIOVISUAL GENERAL REQUIREMENTS