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Old 31st December 2012, 06:26 AM   #1
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Join Date: Dec 2012
Default signal level

Hello There
I'm kinda stuck up in how to calculate the signal level that is being transmitted from my speaker. Let me explain this a bit more clearly.
I'm generating a sine wave of 10KHz from my system and then sending it through a DAQ through a power amplifier and finally transmitting it through a speaker.
Now the voltage range of the DAQ board is -10V to 10V. When this signal goes to the power amplifier, it is powered up(basically voltage level of then signal increases).
Now my query is how do I get to know what is the signal level of my signal after it is powered up by the power amplifier?
This info I require to avoid clipping.
The specs of my power amplifier are as:
O/P Power: 100+100 W
I./P Sensitivity/Impedance: Phono: 6.5mV/22Kohm
Line: 230mV/22Kohm
SNR: Phono: 75 dB
Line: 90 dB
Please help asap..I'll be really glad
Thank you
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Old 31st December 2012, 06:56 AM   #2
Mooly is offline Mooly  United Kingdom
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Join Date: Sep 2007

A few strange terms and ideas in there... I think what you are finally asking is whether or not your system will clip.

Speakers produce a given sound level for a given input. This is the efficiency of the speaker. For example 90db for 1 watt.

The power a speaker "draws" depends on the frequency of the applied signal. This is because the impedance varies with frequency.

Without knowing the voltage gain of the power amp we can't say what the level is.

You might be able to answer all your questions by reading this Using nothing more than a multimeter and the files in post #2 you can work out the power (voltage) you need to avoid clipping in your system,

A Test. How much Voltage (power) do your speakers need?
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Old 31st December 2012, 11:40 AM   #3
sreten is offline sreten  United Kingdom
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Join Date: Nov 2003
Location: Brighton UK

A 100W+100W amplifier driven to its clipping point with a 10kHz
sinewave will promptly very quickly fry the connected tweeters.

rgds, sreten.
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