section 16786 - classroom audio/visual presentation system

section 16786 - classroom audio/visual presentation system
CLASSROOM SOUNDFIELD DISTRIBUTION SYSTEM
PART 1 – GENERAL
1.1
RELATED DOCUMENTS:
A.
Drawings and general provisions of Contract, including General and Supplementary
Conditions and Division-1 Specification sections, apply to work of this section.
B.
This section is a Division-16 Basic Materials and Methods section, and is part of each
Division-16 section making reference to electrical raceways, boxes, fittings, data
distribution, etc., included herein.
1.2
DESCRIPTION OF WORK:
A.
Provide a combined educational presentation system, consisting of a classroom sound
amplification system (CSAS), and supports future implementation of a teacher personal
alert security system with all necessary materials and labor to fulfill the requirements and
the intent of the specifications to form an integrated classroom technology and security
system. Each system shown in the plans, in classrooms or any teaching station shown, is
a complete distinct and individual system as specified herein.
B.
Equipment shall be furnished and installed as specified unless written approval for
substitutions is obtained from the engineer. Catalog sheets of all proposed equipment
shall be provided with the proposal.
C.
All electronic equipment shall be new and of current model. Systems shall be guaranteed
for a period of one (1) year from the date of completion against defective materials,
inferior workmanship or improper installation adjustment. Guarantee shall cover all parts
and labor.
D.
The contractor shall furnish the owner with three (3) complete sets of service and
operating literature.
E.
All equipment shall be installed by a communications contractor with at least five (5)
years experience installing similar systems. The contractor shall be the factory authorized
distributor for the geographical area and shall maintain complete installation and service
facilities.
F.
All work shall be done by expert technicians qualified in the field with knowledge of
systems and detailed requirements for fine tuned performance. Workmanship shall
comply with standard professional broadcast practice concerning grounding, shielding,
cable dressing, cable termination and equipment mounting. All mounting holes shall be
utilized for any equipment.
G.
No amplifier shall be connected to a load that exceeds 90% of the rated output.
H.
Systems shall function without audible distortion, hum, buzz or rattle under normal
operating conditions. Equipment shall be installed plumb and square.
I.
Cables shall be marked with commercial wire markers and shall be designated with the
architectural room number or description of the area served by that circuit.
J.
All equipment shall be installed as shown on the drawings and in strict accordance with
the specifications. Any errors, conflicts, or omissions discovered in the specifications or
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the drawings shall be submitted in writing to the engineer for clarification. Installation
shall not proceed until questions have been resolved.
1.3
QUALIFICATIONS:
A.
1.4
Any system and/or equipment proposed as an equal to that specified must be proven to
conform to the standards established herein. The contractor must obtain the architect's
or engineer's approval in writing, prior to bidding equipment other than that specified.
The manufacturer's name, model numbers and three (3) copies of shop/working drawings
complete with catalog sheets, technical and installation data shall be submitted for
approval.
SUBMITTALS:
A.
PRODUCT DATA:
1.
Submit manufacturer's data sheet including specifications, installation
instructions, and general recommendations for each piece of equipment
specified.
B.
SHOP DRAWINGS:
1.
Submit dimensioned drawings and wiring layout for any changes in wiring from
the layout in the drawings.
PART 2 – PRODUCTS
2.1
2.2
GENERAL
A.
The system shall provide sound enhancement to amplify a teacher’s voice to overcome
the deleterious effects of background noise, reduce teacher fatigue and assure speech
clarity of class presentation and participation. The system shall also provide an
inconspicuous personal alert for the teacher, for future implementation, enabling her to
notify a central location during an emergency situation. No component in the audio
system shall have to be changed out to implement the personal alert at a future date.
Provide an infrared wireless system with no channel restrictions, no interference, a room
contained signal and inputs for two (2) microphones, T.V./DVD, CD and computer and
output for personal FM radio systems. Provide the ability to power up to eight speakers.
System includes speakers, cables, microphones, transmitters, receivers, nickel metal
hydride rechargeable batteries, chargers, etc., as required for a complete operational
system.
B.
The system shall be the Sentinel System by Audio Enhancement. Substitutions are not
permitted.
CLASSROOM SOUND AMPLIFICATION SYSTEM (CSAS) EQUIPMENT:
A.
AMPLIFIER - Audio Enhancement CA-50 Amplifier:
1.
The amplifier shall be used to power the speakers contained within the
classroom. It will provide the ability to connect to the dedicated self-contained
infrared receiver in the ceiling via a CAT-5 cable. The amplifier shall have the
ability to facilitate a recording output for use with interactive technologies. The
amplifier shall be of a low profile design, designed to be mounted vertically so as
to not take up any horizontal shelf space. The width when mounted vertical shall
not exceed 1”.
2.
The Amplifier shall meet the following specification:
a.
Audio Power: 16 Watts RMS
CLASSROOM SOUNDFIELD DISTRIBUTION SYSTEM
16786-2
b.
c.
d.
e.
f.
g.
h.
i.
j.
3.
B.
THD < 1% 50 Hz to 15 kHz
Frequency Response: 50 Hz to 15 kHz +/- dB
Power Requirements: 24 VDC, 2 Amps. Power Supply shall be included
The amplifier shall have the following controls:
Auxiliary Input Volume Controls – 3 Front Panel Controls
Assistive Listening/Line Output – 1 Front Panel Control
Power On/Off - Front Panel Control
3-Band Equalizer – Side Panel Controls – Controls must be rotary shaft
style controls
All volume controls for both the teacher and student pass around
microphone shall be done remotely through the teacher microphone
only. Systems that have level controls for the teacher or student
microphones on the amplifier or in any other location other than on the
teacher microphone will not be considered.
The amplifier shall have the following connections:
a.
Assistive Listening/Line Output – Front Panel
b.
Line/ALD Output – Front Panel
c.
2 Speaker Connections – Rear Panel
d.
3 - 3.5 mm Line Inputs – Rear Panel
e.
1 - 3.5 mm Line Input – Front Panel
f.
Connection Adapter with Modular 8P8C Jack for connection to Ceiling
Infrared Sensor/Receiver
g.
Coaxial 24 VDC Power Connection
INTEGRATED INFRARED SENSOR / RECEIVER – IR-SATELLITE:
1.
The Integrated Infrared Sensor/Receiver will be an independent system, with all
necessary electronics to support the infrared receiving functionality mounted in
the ceiling. The sensor/receiver will be connected to the amplifier through a
universal twisted pair cable, using balanced audio connections. Power for the
infrared sensor receiver will be provided through the same cable as the balanced
audio connections.
2.
The sensor receiver will provide the following functionality. These features must
be included on board the sensor/receiver, and not require any external support to
perform these functions.
a.
Dual Channel Infrared reception
b.
Auxiliary Input
c.
Remote control of both infrared channels, and the auxiliary input from the
teacher microphone
d.
Public address system mute terminals – This is a contact closure
connection when closed, it mutes the audio output from the
sensor/receiver
e.
Advanced Feedback Blocker
i.
The system shall have the ability to actively control
feedback. This shall be done via an analog circuit that
provides up to five active filters to control specific
frequencies,
ii.
The Feedback Blocker shall also have the ability to lower
the overall of the system by up to 6dB, during a user
error situation where the overall system gain is manually
turned up too high
iii.
The Feedback Blocker system shall automatically
remove the filtering upon resolution of the user initiated
error condition
iv.
The Feedback Blocker shall be of an analog design – in
order to avoid the detrimental effects of digital sampling,
CLASSROOM SOUNDFIELD DISTRIBUTION SYSTEM
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only analog systems shall be considered in order to
implement this feature.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
C.
Audio Output
i.
The system shall have the ability to provide both 3
independent audio signals (Ch 1, Ch 2, and Aux) or with
the change of a DIP switch, provide a mixed signal.
ii.
The system shall provide an audible tone when the
remote volume control on the teacher microphone is
used. It will also provide a low & high output level, and
an on/off selection via a DIP switch setting
iii.
The system shall have the capability of attenuating its
output level by -10 dB with a DIP switch setting
Emergency Alert Contacts
i.
The system shall provide a trigger signal when the
teacher presses and holds a button on her transmitter for
more than 2 seconds.
ii.
The system shall be capable of providing a visual
indication of 3 red LED’s when the teacher initiates a
trigger signal
iii.
The system shall also be capable of receiving a trigger
acknowledgement signal back from an external source,
and altering the visual indicator from 3 red LED’s to 2
Green and 1 red LED.
Control System Integration
i.
The system shall have on board the capability of being
controlled via RS-232 protocol.
ii.
The system shall also have the capability of
broadcasting RS-232 commands when the teacher
presses the up/down volume controls on their
microphone
Power Requirements: 24 VDC, Power Supplied from the amplifier.
Receiving Frequencies: 2 selectable frequencies: 2.3 MHz and 2.8 MHz.
Receiver Type: Tuned Radio Frequency (TRF)
Signal-to-noise: >80 dB
External Sensor(s}
i.
The system must be capable of operating in a standard
classroom without the addition of any external sensors
ii.
For larger spaces, the system must be capable of
support up to 4 additional infrared sensors
Mounting Bracket as required
Controls: System must have available the following controls
i.
Channel 1 Volume Control – Fully controllable from the
teacher microphone remotely through the Infrared
system
ii.
Channel 2 Volume Control – Fully controllable from the
teacher microphone remotely through the Infrared
system
iii.
Auxiliary Input Volume Control – Fully controllable from
the teacher microphone remotely through the Infrared
system
4-Channel Body Pack Transmitter (Audio Enhancement Infrared Enhanced Teardrop
Microphone):
1.
2.
Provide a 4-channel body pack transmitter with performance as follows:
Sub-carrier frequencies: 4 selectable frequencies from 2.00 MHz to 4.00 MHz
CLASSROOM SOUNDFIELD DISTRIBUTION SYSTEM
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3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
D.
Audio distortion: <1.0% ( ±40 kHz deviation @ 1 kHz)
Integrated microphone.
Internal charger circuit.
Built-in infrared emitters.
Power button functionality
a.
Power on – turns the microphone on when microphone is off and button
is pressed
b.
Mute – mutes the microphone when pressed and released once
microphone is turned on
c.
Power Off – push and hold to turn power off
Function (F) Button Features
a.
F2 Functionality – Provides security alert when button is pressed and
held for more than 2 seconds
b.
F1 Functionality – Provides simple logic signal on F1 terminals on the
back of the Ultimate IISE
External Inputs
a.
Provide an inputs for an external microphone
b.
Provide an input for a stereo auxiliary input (Mixed to Mono in
microphone)
Microphone Element – The teacher microphone shall utilize a 10mm microphone
element to insure optimum frequency response and maximum pickup of
teacher’s voice.
Power 1 - “AA” NiMH Batteries (Systems using 2 batteries will not be
considered)
Provide remote volume control for the system from the teacher’s transmitter
a.
Volume control via the infrared wireless microphone system to allow the
teachers to remotely adjust their own volume level.
b.
Volume control for the other channel from the teachers microphone
c.
Volume control for the auxiliary inputs
d.
‘F’ (Function) Button – Provide remote control functionality that allows for
enabling additional multi-use functions from the teacher microphone.
Smart Sensor Charging Circuit
a.
Charging circuitry in microphone must have the ability to sense what type
of battery has been placed in the microphone. The charging circuitry
must also carefully manage the charge and dis-charge cycles of the
batteries to maximize battery life.
b.
A system that simply senses voltage present on a 3rd contract is not
acceptable; the charging circuitry must be able to distinguish between
NiMH, NiCD and Alkaline batteries.
4-channel hand held transmitter (Audio Enhancement Infrared Handheld Microphone):
1.
2.
3.
4.
5.
6.
Sub-carrier frequencies: 4 selectable frequencies from 2.00 MHz to 4.00 MHz
Integrated microphone
Internal charger unit.
Power 1 - “AA” NiMH Batteries (Systems using 2 batteries will not be
considered)
1/8” (3.5 mm) auxiliary input connection - Provide an input for a stereo auxiliary
input (Mixed to Mono in microphone)
Operational Modes – the handheld microphone must be equipped with two
operational modes
a.
Push-to-Talk Mode – the user simply depressed the power button to talk,
and when released the microphone automatically turns off – this provides
for a number of separate microphones to be used consecutively and
greatly reduces the chance of channel interference
b.
Power-On Mode – The user depresses the power button, and slide is
CLASSROOM SOUNDFIELD DISTRIBUTION SYSTEM
16786-5
7.
8.
E.
ADDITIONAL EXTERNAL DOME SENSOR – If Required (Audio Enhancement Infrared
Dome Sensor):
1.
2.
3.
4.
5.
F.
vertically into the on position – this holds the microphone in the on state
for continuous operation
Microphone Element – The Handheld microphone shall utilize a 10mm
microphone element to insure optimum frequency response and maximum
pickup of teacher’s voice.
Smart Sensor Charging Circuit
a.
Charging circuitry in microphone must have the ability to sense what type
of battery has been placed in the microphone. The charging circuitry
must also carefully manage the charge and dis-charge cycles of the
batteries to maximize battery life.
b.
A system that simply senses voltage present on a 3rd contract is not
acceptable; the charging circuitry must be able to distinguish between
NiMH, NiCD and Alkaline batteries.
Power: Powered by receiver.
360-degree Reception Angle, Ceiling mounted dome sensor.
Cable: Minimum 32.8’ (10 m), Co-Ax Cable (Provide Plenum rated only where
required by code)
Mounting: Metal bracket.
Internal construction of diodes in 360-dgree sensor shall be lensed to provide
superior infrared reception. Unlensed diodes shall not be considered.
Loudspeaker:
1.
Provide complete distributed ceiling mounted speaker system (Metal back box,
speaker, grill, etc.). Audio Enhancement Model CS-09, number as required
(minimum 4, no cluster) with performance and safety features as follows:
2.
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
Frequency Range: 70 Hz to 15 kHz (-10dB)
Frequency Resp: 100 Hz to 14 kHz +/- 3dB
Power Handling: 50 Watts continuous
Driver type: 4 in. (102 mm) Cone
System type: Tuned and vented
Sensitivity:
88 dB 1 Watt/1 Meter
Impedance:
8 Ohms nominal
Mounting:
Integrated C-Clamp
Plenum rating: Speaker back can meets UL2043 criteria for plenum
installation
Terminals:
All metal spring terminals
Dimensions:
Depth 5.8 in. (147.3 mm)
Grill Diameter: 8.5 in. Dia. (216 mm)
Mounting hole : 7.0 in. (178 mm)
Weight:
3.0 lbs. (1.36kg)
PART 3 – EXECUTION
3.1
INSTALLATION OF SOUND SYSTEMS:
A.
Install each system shown as indicated, in accordance with equipment manufacturer's
instructions, and with recognized industry practices, to ensure that system equipment
complies with requirements. Comply with requirements of NEC and applicable portions
of NECA's "Standard of Installation" practices.
CLASSROOM SOUNDFIELD DISTRIBUTION SYSTEM
16786-6
B.
Provide each individual CSAS with a receiver/amplifier, teacher microphone with
transmitter, hand held microphone, external sensors as required, speakers as required
(minimum 4) and all cable necessary. Before rough-in, test each application for the
number and location of sensors and speakers required. Install sensors as required for
complete coverage in all parts of the space. Coordinate the number of speakers required
with the reflected ceiling needs. Provide a back box for each speaker and verify all
support requirements. Provide audio wiring from the receiver/amplifier to the video
system controller in the room.
C.
Coordinate with other electrical work, including cable/wire, raceways, electrical boxes and
fittings, as appropriate to interface installation with other systems work.
D.
Provide each video system with all equipment specified and cables shown for a complete
system.
E.
Provide stainless steel cover plates on all devices and boxes serving the Audio/Visual
system to match other electrical system devices.
3.2
FIELD QUALITY CONTROL:
3.3
EQUIPMENT CHECKOUT:
A.
3.4
TESTING:
A.
3.5
Upon completion of installation of the, system and after electrical circuitry has been
energized, demonstrate capability and compliance with requirements. Where possible,
correct malfunctioning units at site, then retest to demonstrate compliance; otherwise,
remove and replace with new units, and proceed retesting.
WARRANTY:
A.
3.6
Provide equipment checkout by a factory trained and authorized technician before
energizing circuits. Make final connections under his direction.
The contractor shall warrant the equipment to be new and free from defects in material
and workmanship, and will, within one year from date of installation, repair or replace any
equipment found to be defective. This warranty shall not apply to any equipment which
has been subject to misuse, abuse, negligence, accident or unauthorized modification.
TRAINING:
A.
Provide a minimum of four (10) hours (minimum) training on the operation and
maintenance of the audio/visual presentation system, at job site. Provide programming
and software training as required to allow the district to do any programming that the
supplier is allowed to do during commissioning, testing, service and field additions or
deletions to the system. Illustrate utilization of all components, DVD, VCR, projector, etc.
and the interaction of the complete system. Conduct separate 2-hour sessions in each
“pod” and each grade level. Provide this training at no cost to the Owner, including
transportation, lodging, meals and training manuals.
END OF SECTION 16786
CLASSROOM SOUNDFIELD DISTRIBUTION SYSTEM
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