Power Selection; Equalisation; Dimensions - Tannoy i7 Contour User Manual

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6. Power Selection (i7T Contour)

Determine the maximum power in watts needed at each speaker location. The i7

Contour transformer can be tapped at 15W, 30W & 60W (left to right positions

respectively) via the rotary switch located on the rear of the loudspeaker cabinet. 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 15-watt transformer tap, it means that at full

rated amplifier output the speaker will receive the full 15 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

The i7 Contour 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.

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I7t contour