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31st December 2012, 06:26 AM
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#1 |
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diyAudio Member
Join Date: Dec 2012
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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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31st December 2012, 06:56 AM
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#2 |
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diyAudio Moderator
Join Date: Sep 2007
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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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------------------------------------------------------- A simulation free zone. Design it, build it, test it. |
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31st December 2012, 11:40 AM
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#3 |
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diyAudio Member
Join Date: Nov 2003
Location: Brighton UK
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Hi,
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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There is nothing so practical as a really good theory - Ludwig Boltzmann When your only tool is a hammer, every problem looks like a nail - Abraham Maslow |
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