Speco Technologies P-30FACC User Manual

 

10

For 25V and 70V CONSTANT VOLTAGE LINE CONNECTIONS 
(refer to figure 4). 

IMPORTANT NOTICE:  When the 25V and 70V constant line voltages are used, a line 

matching transformer must be used with each speaker. All 

transformers must be connected in parallel. 

70V

25V

C

N

9

0

5

Jumper positions for
70V or 25V selection.

 

(25 VOLT LINE OR 70 VOLT LINE) 

ALWAYS CONNECT LINE TRANSFORMERS IN PARALLEL 

NEVER CONNECT LINE TRANSFORMERS IN SERIES 

25V Transf.

70V Transf.

 

FIGURE 4

Speaker impedance taps for 4, 8 and 16 Ohm speakers are provided on a terminal strip on the rear 

panel of the unit. Also, outputs for 25V and 70V constant line voltage are provided. To connect the 

power output directly to a speaker or PA horn or a combination of speakers and/or PA horns which 

have a resulting voice coil impedance of 4,8 or 16 Ohm, connect to the COM and the proper 

impedance tap on the terminal strip. Be sure the speaker(s) or PA horn(s) is capable of handling 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 or the 25V or 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 the 25V or 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.