TOA Electronics I6 AW - Manual (Page 5)

6. Power Selection (i6T AW)
Determine the maximum power in watts needed at each speaker location. The i6 AW
transformer can be tapped at 30w, 15w, 7.5w, & 3.75w via the rotary switch located on
the metal plate at rear of the loudspeaker. When the relevant tappings have been
selected add the individual wattages required at all speakers and select an amplifier
with a rating equal to or exceeding the total wattage required. All of the transformer
primaries should be connected in parallel to the output of this amplifier. If for example,
you select the 7.5-watt transformer tap, it means that at full rated amplifier output the
speaker will receive the full 7.5 watts. If the amplifier gain is reduced each speaker will
receive a proportional amount of power, maintaining the overall system balance.
When calculating amplifier wattage requirements for a system, it is recommended that
a generous wattage safety margin (3dB of headroom) be left so that the system does
not have to operate continuously at its full rated output
7. Equalisation
The i6AW loudspeaker is designed to need no equalisation or correction to overcome
system limitations. As a result, it will only need equalisation to compensate for difficult
acoustic environments.
Over equalisation can reduce system headroom, and introduce phase distortion
resulting in greater problems than cures. If equalisation is required then it should be
applied gently and smoothly. The i6AW loudspeaker is a point source, phase coherent
design and violent equalisation will be detrimental to the overall sound quality.
8. Dimensions