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SECTION 3: REFERENCE INFORMATION
The following information is provided for reference only. Please consult a professional if
unsure about any aspects of commercial or residential installations.
SPEAKER CONNECTION
The rear panel of the amplifier contains 5, zoned speaker connections.
BE SURE TO CONNECT SPEAKERS PROPERLY, see line voltage instructions below.
The speaker lines are to be connected directly between the appropriate COM terminal on the
terminal strip and the terminal corresponding to the impedance of the speaker(s).
Connect the cables to the terminals on the screw terminal strip provided. Use the screw
terminals which correspond to the proper polarity of the speaker(s). One lead must always be
connected to the COM.
IMPORTANT NOTICE: When 70V or 25V constant line voltages are used, a line matching
transformer must be used with each speaker. All transformers must be connected in parallel.
ALWAYS CONNECT LINE TRANSFORMERS IN PARALLEL, NEVER CONNECT IN SERIES
SPEAKER IMPEDANCES
Speaker terminal taps for 70V constant line voltage are provided on the rear panel of the unit.
To connect the power output directly to a speaker or PA horn or a combination of speakers
and/or PA horns, connect to the COM and (+) terminal on the strip. Be sure the speaker(s) or PA
horn(s) can handle a reasonable power output from the amplifier or permanent damage to the
speaker(s) or PA horn(s) may result. Also, be careful not to overload the amplifier with too
many speakers or PA horns. If it is desired to use a number and variety of speakers, the
speakers must be arranged in various series or parallel arrays to provide proper impedance
matching. 70V constant line voltage must be used (parallel connection only). If you are not
familiar with impedance matching, consult a professional installer or technician for advice. If
70V constant line voltages are used, a line matching transformer must be used with each
speaker. Again do not overload or use incompatible speakers. Line transformers are the
preferred method for multi-speaker installation.
CABLE REQUIREMENTS
Output cabling need not be shielded in most cases and should be of sufficient gauge to minimize
losses due to the resistance of the wire over long runs (insertion loss). Cable thinner than 18
gauge AWG is not recommended. Long runs require 16 gauge AWG or heavier.
In some cases where the output cable is run in close proximity to unshielded intercom cables,
electrical cables, radio transmission antennas or other sources of interference, or when the
amplifier is being used for paging from a telephone system, the amplifier may require shielded
output cabling to prevent audio feedback or interference.
PRIORITY PAGE
The amplifier features a voice activated priority page circuit and automatically mutes all
program material (Auxiliary, Module, Microphone, etc.) from the amplifier's output, and
permits MIC 1 and the TEL input to override for paging announcements.
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For more information contact Speco Technologies
200 New Highway, Amityville, NY 11701• Toll Free: 1-800-645-5516•Fax: 631-957-9142 or 631-957-3880•www.specotech.com
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