Single channel measurements for xover design ?

percy · 10:12 PM

Please educate me –
Single channel measurements do not have a “reference” signal looped back from the output. An example of this would be using a mono mic input.

Question is –Are such single channel measurements still suitable for crossover design ? Please explain your answer - Why ?
You can assume the output/input amplifiers and mic all have flat amplitude response, or atleast have been compensated for in some way (calibration files).

speaker dave · 22nd March 2012, 09:46 PM

The reason for dual channel measurements is that you can subtract the input from the output and not worry about what your stimulus was. If it wasn't flat the error will cancel out. In reality if you stimulus is flat then single channel is fine, the measurement accurately reflects the transfer function. Finally, even of your stimulus isn't flat, you can measure it with a single channel type, save the measurement and subtract/divide it out later, to cancel the errors.

David S.

percy · 23rd March 2012, 01:00 AM

any implications in terms of phase ? that's what I was trying to allude to by saying 'for crossover design'.

speaker dave · 23rd March 2012, 02:11 AM

No, a single channel system is just as good at measuring phase.

22nd March 2012, 08:41 PM	#1
percy diyAudio Member Join Date: Apr 2004 Location: MN	Single channel measurements for xover design ? Please educate me – Single channel measurements do not have a “reference” signal looped back from the output. An example of this would be using a mono mic input. Question is –Are such single channel measurements still suitable for crossover design ? Please explain your answer - Why ? You can assume the output/input amplifiers and mic all have flat amplitude response, or atleast have been compensated for in some way (calibration files). Last edited by percy; 22nd March 2012 at 10:12 PM.

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22nd March 2012, 09:46 PM	#2
speaker dave diyAudio Member Join Date: Nov 2009 Location: Toronto	The reason for dual channel measurements is that you can subtract the input from the output and not worry about what your stimulus was. If it wasn't flat the error will cancel out. In reality if you stimulus is flat then single channel is fine, the measurement accurately reflects the transfer function. Finally, even of your stimulus isn't flat, you can measure it with a single channel type, save the measurement and subtract/divide it out later, to cancel the errors. David S.

23rd March 2012, 01:00 AM	#3
percy diyAudio Member Join Date: Apr 2004 Location: MN	any implications in terms of phase ? that's what I was trying to allude to by saying 'for crossover design'.

23rd March 2012, 02:11 AM	#4
speaker dave diyAudio Member Join Date: Nov 2009 Location: Toronto	No, a single channel system is just as good at measuring phase.