Yamaha NEXO Alpha & Alpha E Series Owner's Manual download pdf (Page 17)

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AMPLIFIERS

ALPHA SERIES USER MANUAL V1.0

DATE: 14/01/00 18:27

3. Measure the Voltage at the output of the amplifier.

4. Calculate the gain using the formula 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 a different gain value when the amplifier

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 amongst amplifier manufacturers. This gain setting improves

signal to noise ratio and allows all preceding electronic equipment, including the TDcontroller, to

operate at optimum level. Remember that using a high gain amplifier will proportionally raise the

noise floor by the same amount.

Advanced protections

Some high-end amplifiers may have some advanced functions similar to those found in the NX241

TDcontroller ("loudspeaker offset integration", "limiter", "compressor"...). These functions are not

adapted to specific system requirements and may interfere with the complex protection algorithms

used in the NX241. NEXO do not advise using other protection systems in conjunction with the

NX241 and they should be disabled.

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Yamaha NEXO Alpha & Alpha E Series Owner's Manual Page 17