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E Series – E15 & E25 Operating Instructions
Changing the Gain of Your Amplifier: Internal Adjustments!
These instructions are for use by qualified personnel only. Before any routine maintenance,
please ensure that your amplifier is disconnected from the mains supply!
Gain/Sensitivity Settings
The voltage gain of the amplifier can be selected to be 32dB (standard) or +26dB or a
fixed sensitivity of +6dBu input level* to match system sensitivity as required. This is achieved
by setting links on the input board internally.
After removing the lid and with the rear panel facing away from you, locate the input circuit
board as shown below – it is attached to the input XLR connectors. Find the sets of links as
marked by the arrows, and move them as shown to set the gain as required. Number 1
adjusts channel A’s gain, and number 2 adjusts channel B’s gain.
Remember, setting higher gain does not change the maximum available power but changes
the level of signal input to achieve maximum power. In any case, provided that the input
signal is less than 20dBu/7.7V, the built in limiter circuit will prevent distortion within the
amplifier.
The gain should be set to match the signal level from the source — mixer, equaliser etc.
*Equivalent gain for the fixed sensitivity setting is 31dB (E25:33dB).
Link
26dB
Gain
3&4
1
5
Gain A
1
5
Gain B
1
2
Link
32dB
Gain
(default)
1&2
Fixed Sensitivity Setting: +6dBu (1.5V)
Link
(33dB
Gain)
2&3
Link
(31dB
Gain)
4&5
E15
E25
E15 & E25
