and visible identification on the device. Other amps feature internal gain switches that make it difficult to
know the amp gain without measuring or opening it.
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), u
taking care not to choose a value that will overdrive the
amp input!
3/ Measure the Amplitude Volt at the output of the amp.
Gain = 20 * LOG10(Vout/Vin)
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 values when the amp Power is
different.
Gain value
NEXO recommends low gain amplifiers: +26dB is recommended, as it is both adequately low and quite
common. This gain level considerably improves signal to noise ratio and allows all preceding electronic
gear, including the TDcontroller, to operate at an optimum level. Remember that using a higher gain
amplifier will proportionally raise the noise floor level by the same amount.
Advanced protections
Some high-end amplifiers may have some advanced functions similar to those found in the NEXO
TDcontrollers ("loudspeaker offset integration", "limiter", "compressor"...). These functions are not well
adapted to NEXO system requirements and may interfere with existing protection within the TDcontroller.
NEXO recommends disabling these functions.
To Next Page
Loading...
Need help?
General
