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SOME WORDS ON AMPLIFIERS
USER MANUAL LOAD1_80
DATE: 30/08/00 12:48
In cases where you don't know the gain of your amplifier (or want to check it) please read the
following instructions.
1. Unplug any cabinet from the amp
2. With a signal generator feed a sine wave (freq. within the audio range, 1000Hz for example)
Amplitude Vin is not important (1V is rather convenient). Unless if you use 0.7V sensitivity
where you will overflow the amp input!
3. Measure the Amplitude Volt at the output of the amp.
4. Gain = 20 * LOG10(Vout/Vin)
5. Some examples:
Gain
Vin
20dB 26dB 32dB 37dB (1.4V
sensitivity /
1350Wrms)
0.1V 1V 2V 4V 7.1V
0.5V 5V 10V 20V 35.4V
1V 10V 20V 40V 70.8V
Remember that constant sensitivity settings will give you different gain value when the amp Power
is different.
Gain value
NEXO recommends low gain amplifiers: +26dB is recommended, as it is at the same time
adequately low and quite common. This considerably improves signal to noise ratio and allows all
preceding electronic gear, including the TDcontroller, to operate at optimum level. Remember that
using a high gain amplifier will proportionally raise the noise floor level by the same amount.
Advanced protections
Some high-end amplifiers may have some advanced functions like those found in the NX241
TDcontroller ("loudspeaker offset integration", "limiter", "compressor"...). These functions are not
well adapted to specific system requirements and may interfere with existing protection within the
TDcontroller. NEXO do not recommend using these functions with the NX241 TDcontroller
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