c.
Signal-to-noise ratio:
60 dB or greater at rated output
d.
Frequency response ratio:
Plus or minus 2 dB from 200 Hz to
10,000 Hz
2.1.2.5
Horn-Type Loudspeakers
**************************************************************************
NOTE: Use 57 decibels for axial sensitivity of
bi-directional and compound diffraction horns.
**************************************************************************
Horn-type loudspeakers shall be provided with line transformers and
mounting brackets and shall as a minimum conform to the following
specifications:
a.
Plus or minus 3 dB from 250 Hz to 10,000 Hz
b.
Power rating:
[5] [_____] watts
c.
Horizontal dispersion angle:
[one] [1.57] [2] [_____] rad
[57]
[90] [115] [_____] degrees
d.
Vertical dispersion angle:
[one] [1.57] [2] [_____] rad
[57]
[90] [115] [_____] degrees
e.
Axial sensitivity:
Minimum of [57] [60] [_____] dB
f.
Line transformers power rating:
At least 4 watts
][2.1.3
Type 3 System
**************************************************************************
NOTE: Select the appropriate paragraph and its
following subparagraphs for the features desired.
Delete all paragraphs describing features not
required.
**************************************************************************
Provide multiple conversation paths, central control intercommunication
system capable of communicating with the other master stations and remote
stations selectively or in any combination thereof. [Each master station
shall selectively communicate with any other master station or remote
station by actuating number assigned to initiate a message to all other
master stations and all remote stations simultaneously or in groups of not
less than 10 stations.]
2.1.3.1
Master Stations
Provide [desk-top] [surface wall] [recessed wall] [rack]-mounted master
stations with ten digit touch key station selector mechanism. Master
station shall have a speaker-microphone with at least 40 dB sensitivity.
Master station shall also have a push-button type reset button to cancel
calls and reset system for next call.
2.1.3.2
Remote Station
Provide [desk-top] [surface wall] [recessed wall] [rack]-mounted remote
SECTION 16822N
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