PART 1 GENERAL REQUIREMENTS
2.1 DESCRIPTION – AUDITORIUM
A. General: The Auditorium audio-visual system shall provide the following:
1. Sound reinforcement: 72-channel digital audio distribution and mixing system for theatrical or music performances and left-center-right (LCR) full-range loudspeaker system. One (1) iPAD shall be provided and configured for wireless control of the audio mixer using the mixer manufacturer’s app via a dedicated Wi-Fi network separate from the Owner’s Wi-Fi network.
2. Audio/video input transmitter in Owner furnished Lectern for computer presentations via front video projection screen. The Owner furnished Lectern cable harness can be connected at Stage Left or Stage Right Proscenium wall plates.
3. Audio/video input transmitter wall plate at Orchestra Pit center for computer presentations or video playback via front projection screen.
4. One (1) universal disc player in equipment rack ER-2 located at Sound / Light Booth desk for playback of pre-recorded audio/video content.
5. One (1) dedicated, networked CD / media player in equipment rack ER-2 for convenient cueing and playback of pre-recorded audio for theatrical productions. The network CD player shall be configured to enable access to music files stored on the Owner’s network.
6. Sixteen (16) channel wireless microphone system with integrated Dante digital audio network capability.
7. Radio frequency wireless assistive listening system operating at 216 MHz.
8. One (1) analog, 4-channel partyline intercom system shall be provided in Sound / Light Booth, on Stage, catwalks, Production Office, Dressing Rooms, and Music Classrooms to facilitate communication and cueing between the Stage Manager at Sound / Light Booth, talent, and theatre crew during theatrical rehearsals and productions. The 4-channel matrix master station shall enable groups of intercom stations to be assigned to any one of the four (4) intercom channels, enabling maximum flexibility and permitting the Drama Classroom to serve as an ancillary space to the Auditorium for special productions.
9. Control of the integrated audio-visual system from one (1) wired control panel in Owner furnished Lectern, one (1) wired control panel at Stage Right (CP-1), wired control panel at Sound / Light Booth desk (ER-2), or wireless iPad control panel operating on the Owner’s Wi-Fi network.
B. Microphones:
1. Wired microphone inputs are located at Orchestra Pit / Stage apron and around the Stage in (5) wall plates M-7 through M-11. All microphone inputs are routed to rack
mounted digital snakes in AV equipment rack ER-1 for digital routing to the 72-channel mixer at AV equipment rack (mix desk) ER-2. Digital snake inputs have integrated, remote controlled preamplifiers capable of providing phantom power.
2. Wired microphones shall include one (1) shock mounted gooseneck microphone installed in Owner furnished lectern, one (1) desktop gooseneck microphone at mix desk (ER-2), six (6) miniature condenser microphones dead-hung over the Stage, five (5) directional boundary microphones primarily for use as Stage floor microphones, four (4) miniature condenser microphones with 24-inch and 50-inch cable-integrated low-profile booms, four (4) general purpose dynamic microphones, four (4) handheld vocal microphones, and four (4) side-address condenser microphones. Wired microphones shall be provided with accessories necessary for shock isolation, mounting to standard floor microphones stands, and pop-filters / windscreens.
3. Wireless microphones shall include sixteen (16) wireless body pack transmitters each with one (1) earset microphone and one (1) lavaliere microphone, and six (6) wireless handheld microphones. The Contractor shall confirm with Owner microphone types to be provided as part of the wireless microphone system. Wireless microphone receivers shall receive microphone signals from two (2) active, directional remote-mounted antennas located on the Auditorium rear wall. The audio signals from wireless microphone
receivers shall be routed to the digital mixing system via the Dante digital audio network.
4. Contractor shall obtain Architect’s written approval confirming locations of microphones to be installed in millwork or furniture before cutting into or in any way modifying furniture.
C. Audio Mixer: One (1) high performance, networked digital audio mixing system to include desktop mixer and two (2) digital snakes shall be provided for combining microphone and program audio and routing it to the loudspeaker processor via the Dante digital audio network.
The digital snakes shall be installed at Stage equipment rack ER-1 and send audio digitally to the mixer at ER-2 mix desk. The digital audio mixing system shall provide digital signal
processing capabilities including but not limited to automatic mixing, equalization, compression, limiting, and delay processing. Besides the main mixer L/R/C-Mono output busses, the digital mixing system shall provide sixteen independent mix busses (send or aux) and eight (8) independent matrix busses. The mixing system shall provide one-button presets to restore routing, gain, and effects settings for quick set-up and intuitive use. The digital mixer shall be controllable via wireless iPAD configured to run the Manufacturer’s proprietary software app.
The mixer shall provide an integral MIDI control interface for integration into the audio-visual control system via bi-directional RS-232 to MIDI converter so presenters or lecturers can use the audio system via wired control panel or wireless iPad control panel without requiring technical personnel at Sound / Light Booth.
D. Loudspeaker Processor: One (1) high performance digital audio signal processor shall be provided for dedicated loudspeaker processing and signal distribution to power amplifiers.
E. Power Amplifiers: Two (2) 2-channel power amplifiers bridged-mono to provide 2,100 watts (8Ω) shall be provided in ER-1 for driving the center loudspeaker array. One (1) 2-channel 775 watt / channel (8Ω) power amplifier shall be provided for driving the main left and right loudspeakers.
Four (4) 2-channel, 600 watt / channel (8Ω) power amplifiers shall be provided in ER-1 for driving delay left, center, and right loudspeakers and five (5) stage monitor loudspeakers.
F. Assistive Listening System: A radio frequency (RF) assistive listening system (ALS) operating at 216 MHz shall allow for the wireless transmission of program audio to headsets. An RF ALS antenna shall be wall mounted at Auditorium rear wall. Microphones and presentation audio routed through the digital mixer shall be modulated by an ALS transmitter and emitted from the remote antenna. The RF signal is picked-up by wireless body pack receivers worn by the audience members. The RF signal is demodulated back into audio frequencies by the body pack receivers and amplified for listening on headsets. Thirty-six (36) body pack receivers, thirty-six (36) monaural headsets, and nine (9) inductive neck loops shall be provided to meet ADA 2010 requirements for hearing assistance.
G. Voice Reinforcement / Program Loudspeakers:
1. Center Loudspeaker Array
a. One (1) full-range loudspeaker array comprised of three (3) 2-way loudspeakers mounted for acoustic alignment shall be provided for program audio playback, music reinforcement, and voice reinforcement, designated loudspeaker S-2 on the
Drawings. Each of the three (3) loudspeakers in the array shall have one (1) 15-inch woofer and one (1) horn-loaded high frequency driver. The loudspeaker array shall be hung from ceiling located as shown on the Drawings.
b. Directivity: The loudspeaker array shall provide a nominal coverage pattern of 120°H x 40°V.
c. Aiming: The loudspeakers shall be located mounted as shown on the Drawings and shall be aimed as follows:
1) Vertical: the loudspeaker array shall be aimed down twenty-eight degrees (-28°) from horizontal.
2) Horizontal: The loudspeaker array shall be horizontally aimed along centerline of Auditorium.
d. Delay: 20 ms.
e. Signal Processing: The Contractor shall contact the loudspeaker manufacturer and obtain the manufacturer's recommended digital signal processing (DSP) settings and apply those settings to the loudspeaker processor channel(s) feeding the amplifiers for the loudspeaker array.
2. Main Left / Right Loudspeakers
a. Two (2) full-range loudspeakers each with one (1) 15-inch woofer and one (1) horn-loaded high frequency driver shall be provided for program audio playback, music reinforcement, and voice reinforcement, designated loudspeakers S-1 and S-3 on the Drawings. The loudspeakers shall be hung from ceiling located as shown on the Drawings. High frequency horns shall be rotated 90° for mounting in a horizontal orientation.
b. Directivity: Loudspeakers shall provide a nominal coverage pattern of 90°H x 40°V.
c. Aiming: The loudspeakers shall be located mounted as shown on the Drawings and shall be aimed as follows:
1) Vertical: aim down twenty-eight degrees (-28°) from horizontal.
2) Horizontal: Left / Right loudspeakers shall be horizontally aimed or “toed-out”
away from Auditorium centerline by twenty degrees (20°).
d. Delay: 20 ms.
3. Delay Loudspeakers
a. Three (3) full-range loudspeakers each with one (1) 12-inch woofer and one (1) horn-loaded high frequency driver shall be provided as delay playback and voice
reinforcement loudspeakers, designated loudspeakers S-4, S-5, and S-6 on the Drawings. The loudspeakers shall be hung from ceiling located as shown on the Drawings. Delay loudspeakers’ horns shall be rotated 90° for mounting in horizontal orientation.
b. Directivity: Loudspeakers shall provide a nominal coverage pattern of 120°H x 60°V.
c. Aiming: The loudspeakers shall be located mounted as shown on the Drawings and shall be aimed as follows:
1) Vertical: aim down thirty-five degrees (-35°) from horizontal.
2) Horizontal:
a) Left / Right loudspeakers shall be horizontally aimed or “toed-in” towards Auditorium centerline by five degrees (5°).
b) Center loudspeaker shall be horizontally aimed along centerline of Auditorium.
d. Delay: 67.6 ms.
4. Stage Monitor Loudspeakers:
a. Five (5) full-range loudspeakers each with one (1) 12-inch woofer and one (1) horn-loaded 2-inch titanium high frequency driver shall be provided as Stage monitor loudspeakers for connection to the monitor (foldback) outputs around the Stage. The
Stage monitor loudspeakers have a 4 ohm nominal impedance and provide looping Speakon outputs for daisy-chaining multiple loudspeakers off of one monitor mix/output.
b. Directivity: Loudspeakers shall provide a nominal coverage pattern of 90°H x 60°V.
5. Studio Monitor Loudspeakers (Light/Sound Booth):
a. Three (3) full-range studio monitor loudspeakers each with one (1) 5-inch woofer, one (1) 1-inch dome high frequency driver, and integrated power amplifiers shall be provided for monitoring front of house (FOH) mixes from within the Light/Sound Booth. The loudspeakers shall be mounted on desktop vibration isolation stands with adjustable height to elevate loudspeakers from behind the mixer.
b. Directivity: Loudspeakers shall provide a nominal horizontal coverage pattern of 120°.
H. Video Sources and Switching: One (1) auto-switching video input transmitter shall be installed each in Owner furnished Lectern (served by wall plates AV-1 or AV-2) and in wall plate AV-3.
One (1) universal disc player shall be provided and installed in ER-2. Connections shall be provided at ER-2 mix desk work surface for playback of audio/video content or computer presentations from the mix desk. All sources shall be routed through an audio/video switcher with an auto-switching function. This system shall enable signal sensing and automatic input switching so that presenters are not required to select an input source under typical scenarios.
The switcher’s integrated high definition video scaler shall be configured to optimize video for the video projector.
I. Video Projection: One (1) 3-chip DLP, 1920 x 1080 native resolution video projector with 13,500 lumens of light output shall be provided for viewing of computer presentations, films, and other pre-recorded video content in the audience area. The projector shall display on an 11.25 feet high by 20 feet wide (275” diagonal), 16:9 aspect tensioned projection screen with high definition, wide 75 degree half-gain viewing angle, 1.3 gain screen surface.
1. Ambient Light: The video projection system has been designed to provide greater than 10:1 contrast ratio with a maximum of 5 foot candles of ambient light on the projection screen. Coordinate lighting control requirements and architectural lighting fixture aiming / focus with the Electrical and Lighting Contractors to provide the minimum ambient light level on the projection screen.
2. Projector Location: The Contractor shall install the video projector to the underside of the Catwalk as shown on the Drawings.
a. The video projector shall be mounted to Catwalk beam using an I-beam clamp and heavy-duty projector mount with roll, pitch, and yaw adjustments.
b. The projector shall be pitched down as required to align the projected image with the screen image area.
c. The Contractor shall provide ant-vibration mounting hardware as necessary to minimize shaking of the projector and projected image during normal use of the Catwalk.
3. Screen Location: The Contractor shall hang the projection screen case with threaded rod or rigging-grade steel chain from building structure where shown on the Drawings. Install projection screen at 18’-5” AFF to bottom of case or at highest elevation to place the projected image where shown on the Drawings with maximum available black drop of 30 inches.
4. Coordination: The Contractor shall coordinate video projection system projector and screen locations and mounting methods with lighting equipment and Stage rigging as required to guarantee a successful installation with optimum image quality. The Contractor shall field verify mounting locations, mounting methods, and mounting hardware required.
J. Intercom System: One (1) analog, 4-channel party-line intercom master station with matrix switches shall be provided in Light / Sound Booth for the Production Director. The master station shall be interfaced with the audio mixer for program audio distribution on the party-line
buses and announce from the Production Director’s intercom microphone through the house loudspeakers. One (1) 2-channel intercom station shall be provided at mixer desk. Two (2) flush mounted, channel headset stations shall be provided at Stage Left and Stage Right.
2-channel belt pack connections are provided throughout the Stage area and above finished ceiling on the catwalks for theatre crew. Intercom wall stations are provided at backstage Male / Female Dressing Rooms, Scenery Shop, Drama Classroom (via Drama Classroom intercom main station), Music Classrooms, Production Office, and Ticket Office.
K. Dedicated wireless network for mixer remote control: One (1) high performance, dual band wireless (Wi-Fi) router and one (1) wireless (Wi-Fi) iPad shall be provided for remote control of the audio mixer via the mixer manufacturer’s proprietary remote control app on a dedicated wireless network:
1. The wireless router shall provide a dedicated 802.11n network at 5 GHz for mixer remote control with the Mixer iPad.
2. Configure the wireless router with WPA2 security, do not broadcast the SSID, and select the wireless channel with the least interference for maximum range.
3. Contractor to test wireless network performance with Mixer iPad running the mixer manufacturer’s remote control app in stage area and confirm reliability of the wireless signal. If the Mixer iPad performance is intermittent or with increased latency in the stage area due to distance or Wi-Fi band interference, the contractor is to install Linksys model RE6500 dual band wireless range extender in ER-1 and connect it to the router at ER-2 via an additional CAT-6 run between ER-1 and ER-2.
L. Control System:
1. One (1) 10” wired touch screen control panel shall be provided at Sound / Light Booth desktop mixer and shall enable complete control of the audio-visual system to include the following capabilities:
a. Power on / off of audio-visual system via control processor and power sequencer(s) in equipment racks. Note power on / off does not affect networking, control system, or battery charging equipment.
b. Single button “scenes” with audio-visual system settings for the most common usage scenarios.
c. Selection of audio mixer routing presets, to include integrated automatic mixer routing and settings.
d. Audio mixer signal levels to include gain of audio/video sources, presentation
microphones, and loudspeaker volume control (at output of mixer feeding amplifiers).
e. Audio / video source selection and routing of AV switcher.
f. Universal disc player transport controls and other settings.
g. CD / media player transport controls and other settings.
h. Video projector on/off and all relevant settings.
i. Projection screen up / down.
j. Lighting scene selection to include on / off.
k. A signal from the Life Safety system mutes all loudspeakers (or shuts down the audio-visual system) and an emergency notification screen is displayed on / over whatever screen the control panel is currently displaying.
l. Other capabilities as directed by the Owner.
2. One (1) 7” wired touch screen control panel shall be installed each in Owner furnished Lectern and at Stage Right wall (“CP-1”) and shall enable simplified remote control of the audio-visual system by community groups, rental clients, or other guests of the School, to include the following capabilities:
a. Power on / off of audio-visual system.
b. Single button “scenes” with audio-visual system settings for the most common usage scenarios.
c. Selection of audio mixer routing “snapshot” for presentations with Lectern mic and / or wireless microphone channel(s) through the mixer’s integrated automatic mixing engine.
d. Audio mixer signal levels to include Lectern audio/video source gain, mic mute, and loudspeaker volume control (at output of mixer feeding amplifiers).
e. Video projector on/off.
f. Projection screen up / down.
g. Lighting scene selection to include on / off.
h. Other capabilities as directed by the Owner.
3. One (1) wireless (Wi-Fi) iPad control panel shall be provided and stored on a charging base at Sound / Light Booth desktop adjacent to equipment rack ER-2 for use when presenters require limited control of the audio-visual system from the Orchestra Pit, or anywhere else in the Auditorium when the Lectern is not being used. This iPad shall be configured on the Owner’s Wi-Fi network for remote control of the audio-visual systems via the custom control system. The wireless control panel shall enable control of the audio-visual system to include the following capabilities:
a. Power on / off of audio-visual system.
b. Single button “scenes” with audio-visual system settings for the most common usage scenarios.
c. Selection of audio mixer routing “snapshot” for presentations with Lectern mic and / or wireless microphone channel(s).
d. Audio mixer signal levels to include Lectern audio/video source gain, mic mute, and loudspeaker volume control (at output of mixer feeding amplifiers).
e. Video projector on/off.
f. Projection screen up / down.
g. Lighting scene selection to include on / off.
h. Other capabilities as directed by the Owner.
4. Secure touch screen control panels: restrict access to functions based on user login type as determined by the Owner. Touching welcome screen activates Login screen which prompts user for an access code.
5. All touch screen control panels mirror the state of the control processor and all attached devices.
6. All touch screen control panel GUIs shall be the same with the exception of omitted, disabled, or “grayed-out” buttons and/or pages for capabilities not permitted on certain control panels or for certain user types.
7. Power Sequencing:
a. Cascaded power sequencers and remote-controlled power distribution units shall be provided in ER1 and ER2 and configured for safe power-up and power-down of the audio-visual system.
b. “Always On” outlets shall be reserved for all network, control system, and battery-charging electronics.
c. Switched outlets shall provide power to signal processing AV equipment through power distribution units (PDUs) for required outlet count. Additional power
sequencers and distribution products shall be provided by the Contractor as required to integrate electronics mounted on the Light/Sound Booth work surface into the power management system.
d. The power sequencing / conditioning system shall be programmed so signal
processing equipment turns on first and amplifiers turn on last during system startup.
The sequencing system shall turn off amplifiers first upon system shutdown. Program sequencers to power on equipment in the order recommended by Manufacturers.
e. The audio-visual control system shall be programmed so that power sequencing up or down shall be initiated by momentary—not latching—closure. The momentary mode enables on / off control of the audio-visual system to be possible from control panel(s) as well as from master power sequencer front panel switch.
8. Coordinate control system requirements with the Owner, to include welcome screen graphic, graphical user interface GUI layouts for touch screens, and desired control capabilities.