Northern Airborne Technology PA700 - Manual (Page 8)

PA700 Series High Power Voice Amplifier
SM44 Installation and Operation Manual
Section 1 Rev: 1.00 Issue 4 Page 1-4
ENG-FORM: 800-0114.DOT
CONFIDENTIAL AND PROPRIETARY TO NORTHERN AIRBORNE TECHNOLOGY LTD.
1.5.3 Loudspeakers
Various types of loudspeaker arrays can be used in sound systems using the PA250/700 amplifiers.
They are identified by the style and number of drivers (and bells) in each speaker array as shown in
Table 1. As a guideline for system configuration, there should be a minimum of 1 speaker driver/bell
assembly for each 100 watts of amplifier power.
Part No. Description
TS92-02XN Standard two-bell array with drivers
TS92-04XN Standard four-bell array with drivers
TS93-04XN Standard four-bell cloverleaf array with drivers
TS94-04XN Standard four-bell mini speaker array with drivers
Table 1
Speaker Arrays
Each PA700 Series Amplifier has two loudspeaker outputs and easily supports two 4-bell arrays.
For comparison, the efficiencies of the four-bell and six-bell speakers relative to the two-bell are shown in
Table 2 (assuming the same input power is delivered to each type).
Part No. Description Efficiency
TS92-02XN Standard two-bell array with drivers 100%
TS92-04XN Standard four-bell array with drivers 195%
TS92-06XN Standard six-bell array with drivers 285%
Table 2
Efficiencies
The higher efficiency rating is due to more concentrated sound patterns and lower, more efficient power
conversion at each speaker driver. The larger speakers can also accept more power from the amplifying
system and may show an even better efficiency rating than these figures indicate.
1.5.3.1 TS92-02XN
The two-bell speaker array is widely used in airborne applications where its light weight and small size
are important considerations. While its output efficiency is not equal to that of the larger loudspeaker
types, it performs well on small and medium-sized aircraft. The size and weight of the two-bell speaker
often permits it to become a permanent installation in the aircraft.
1.5.3.2 TS92-04XN
The four-bell loudspeaker is almost universally chosen for portable sound systems. The greater efficiency
compensates for the additional weight compared to the two-bell speaker.