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Xs900 detail


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#1 mvorchard

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Posted 08 June 2006 - 03:30 PM

Hi again,

Is there any scale on what ouput the amp is producing for certain number of "clicks" at the level knob??

I would appreciate your response.


Thanks,

MO

#2 DGlass

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Posted 09 June 2006 - 09:47 AM

The front panel (Input) Level Controls are what we jokingly refer to as "Notawhatknob" as they do not control the output power of the amplifier but the input drive level.
Every amp has a certain amount of gain or how much the amplifier will amplify the input signal. With that amount of gain there is also a certain "Input Sensitivity". Input Sensitivity is the input signal voltage that will make the amplifier do full output when the amps Input Level controls are turned all the way up.
Amplifier Level Controls are on the input side so they will be controlling the input drive level. The Xs 900 has a gain of 32.5dB and an input sensitivity of 1.64 volts. So if the input knobs were turned all the way up and there was an input signal of 1.64 volts at the input the XS900 would be providing 600 watts of power to an 8 ohm load. If you turned the input level controls down about halfway you would be cutting the input voltage down about half and yes the amp would be putting out less power. However, since the Level controls are attenuating the input signal if you were to raise the input voltage coming into the amplifier you could still get the amp to full output. It would just take a larger input signal.
It’s best to say an amplifier’s Level Controls are “Input Attenuators” and are "Notawhatknob". The Input Attenuators are also not precision attenuators so the clicks are more a placeholder so the knobs are not accidentally moved. smile.gif

#3 mvorchard

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Posted 09 June 2006 - 03:34 PM

QUOTE(DGlass @ Jun 9 2006, 10:47 AM)
The front panel (Input) Level Controls are what we jokingly refer to as "Notawhatknob" as they do not control the output power of the amplifier but the input drive level.
Every amp has a certain amount of gain or how much the amplifier will amplify the input signal. With that amount of gain there is also a certain "Input Sensitivity". Input Sensitivity is the input signal voltage that will make the amplifier do full output when the amps Input Level controls are turned all the way up.
Amplifier Level Controls are on the input side so they will be controlling the input drive level. The Xs 900 has a gain of 32.5dB and an input sensitivity of 1.64 volts. So if the input knobs were turned all the way up and there was an input signal of 1.64 volts at the input the XS900 would be providing 600 watts of power to an 8 ohm load. If you turned the input level controls down about halfway you would be cutting the input voltage down about half and yes the amp would be putting out less power. However, since the Level controls are attenuating the input signal if you were to raise the input voltage coming into the amplifier you could still get the amp to full output. It would just take a larger input signal.
It’s best to say an amplifier’s Level Controls are “Input Attenuators” and are "Notawhatknob". The Input Attenuators are also not precision attenuators so the clicks are more a placeholder so the knobs are not accidentally moved. smile.gif
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Thanks, man! Once again...!

Thankfully, I have learned what a gain control is...... but you did answer my question in the last line of your email biggrin.gif Thanks to this then!


Cheers,

MO