8.Gain switch channel A. Three of the switches in the
9.AC power cable. WARNING!
A label just below the mains cable on the rear of the amplifier indicates the AC
! mains voltage, for which the amplifier is wired. Connect the power cable only to the
AC source referred to on the label.
5 REAR PANEL FEATURES
5.1 Gain switch
The gain switch located on the rear panel (the central
5.1.1 The DIP-switch
There are separate sections for the two channels, so different gain can be selected for channel A or B. The selection of maximum gain in the amplifier is always a trade between noise and headroom. A
low gain amplifier amplifies less of the noise of the preceding
equipment (mixer, crossover, equalizer etc.). On the other hand a higher lever is needed to get full power, so the headroom will be decreased on mixer output and/or crossover units. In an actively divided system there is very often a
processor or controller involved, being unique for the loudspeaker system. In most cases the manufacturers of these processors and/or loudspeakers recommend a specific system gain for the
amplifiers.
There are eight positions with different gain, from 20dB to 41dB in 3dB steps. See the different settings for the
5.1.2 Sensitivity
Sensitivity is defined as how many volts (rms) or dBu (referred to 0.775Vrms) are required to get full output power. As the output power varies with the load impedance, usually 4 ohms is the reference. But in case of an
Hence we recommend calculating the sensitivity if this is necessary. Our ”Audio calculator” can do this, which is an Excel file with many useful formulas. It contains help for setting up digital loudspeaker processors and can be found on our website: www.tannoy.com .
The sensitivity calculator is found in the box labeled “Amplifier gain conversions”. The values to enter are in red; desired output power (see
5.13.Options
As the
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TA 1400 User Manual |
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