The 8 speaker illustration  shows how eight speakers are connected in  series / parallel arrangements. The resultant impedance works out be 8 ohms so these are connected between ‘C’ and 8 ohms tap, which is a case of  EQUAL MATCHING as eight speakers can safely handle the power output of  AR-300.

70/ 100 VOLTS LINE SYSTEM : 100 Volt line system is a standardized  system for connected speakers in complex and large installation. For using the above system, one should preferably select speakers/ unit-horns with built –in line match transformers each marked with selectable wattages like 5W,15 W, and  20 W. However, separate line matching transformer like PH-2022 or PH- 3011 can also be mounted on the loudspeakers for 100 V line operation. Although 100 V line system is basically meant for installations requiring large number of speakers yet nothing prevent one form using this system when only two or four loudspeakers are to be installed.

100V line system Advantage over the 4-8 ohms direct connections : (1) In large P.A. installations, it permit the distribution of power output of the amplifier to different speakers at different output wattages. For instance the loudspeakers close to the stage (i.e. microphones) need less power to avoid feedback, while those placed at a distance have to be fed with more power output. Similarly in areas where more noise is anticipated more power can be fed to speakers by connecting these to higher wattage taps on the line matching transformers. (2) 100V line system simplifies the wiring of the speakers as no calculations are required to arrive at the correct matching impedance. (3) The loudspeakers can be wired in parallel with two wires running form one end to the speakers placed at the farthest distance. (4) The system protects the life of the driver units as these will work within the selected wattages to, even when the volume on the amplifier is turned to ‘full’. (5) The loss (wastage) of power output in the cables/ wire is  legible. If  the loudspeaker is wired 50 Mtr.(160 ft.) away from the amplifier and is fed with 15 watts power output from it,14 watts will reach the driver unit as against 10 watts that would have reached on 4-8 ohms operation. Even when the speakers are installed at 200 meters (650 ft..) distance the loss (wastage) of power in the cables will be nominal.

These two illustrations depict use of 100V line operation. The four loudspeakers nearer to the stage are fed with lesser power level. Both the rows of speakers are fed form the same amplifier. Please make sure that the sum total of the wattages selected on each speaker does not exceed the Rated Output power of the amplifier. For instance, if a total of 10 speakers are connected to PH-300   6 on 10 watts tap and 8x20 watts tap, the total power output that these speaker will draw will be 6x10 watts = 60 watts plus 8x20watts=160 watts i.e220 watts which dose not exceed the Rated Power Output of PH-300. Amplifier is safe & give good quality sound.

CAUTION: WHEN 100 VOLT LINE IS BEING USED, NO SPEAKER SHOULD BE CONNECTED TO 4-8 W ohms (LOW IMPEDANCE) TAP

USE OF 70 VOLTS LINE : When a  loudspeaker/ unit with line matching transformer is wired to its 15 watts tap and connected between COM and 100V tap, it draws  unto 15 watts power from the amplifier. If the same is connected between ‘C’ and 70V, it will be able to draw only half the power output i.e. upon 7.5 watts. A good use of 70V line tap can be made in installations where large number of speakers/ units are to be installed for more even distribution of sound.