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Hello there - in using REW to tune my car stereo, Id like to use a type A USB to USB to connect my windows laptop to my Alpine headunit. When I do so, my head unit does not recognize my PC so no test sounds can be heard. Is there a way to leverage my laptops USB connection for output or am I stuck using a soundcard (i.e. Behringer U control) and standard analog connection? Thank you for the help
 

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Is there a way to leverage my laptops USB connection for output
No, your head unit will not present itself to the PC as a soundcard. The USB port on the head unit is more likely to be set up as a host to read files from memory sticks.
 

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Thanks John. I guess I will have to use my headunits AUX (RCA) input to run sweeps. I was trying to avoid this as it would entail removing my deck.
 

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You could use the acoustic timing reference option to play back a saved sweep. To do that, select acoustic timing reference in the Analysis preferences. Then open the signal generator, select the measurement sweep, set it for the range you want to measure then save the signal as a WAV, selecting the option to add a timing reference to the signal. Open the measurement dialog, select the option to wait for timing reference then press Measure. Then play the WAV you saved through the system. Note that the settings in the measurement dialog must be exactly the same as those used when saving the WAV, otherwise the result will not be valid. Can save one sweep for the left channel and another for the right.
 
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