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<blockquote data-quote="Adam Black" data-source="post: 56180" data-attributes="member: 702">Re: Dual Channel FFTNot sure I understand the question. I&#039;m reading it as asking if there are advantages to a physically loop backed reference signal versus a software loop backed reference signal. From a measurement perspective, no not really. In fact the additional delay of the software based solution could be problematic if using the measurement for timing purposes. The single biggest advantage to the software solution is the gained input. If you&#039;re using a two channel device and one input is being used to patch the output signal to an input, you are left with a single input for a mic. Thus you can only do one dual channel measurement at a time. Whereas with a software loop back you can use both inputs for mics and do two dual channel measurements at the same time. Given the cost of multi channel pre amps, this is a good way to move in to the multi measurement realm without having to invest in another device. -A</blockquote>

[QUOTE="Adam Black, post: 56180, member: 702"] Re: Dual Channel FFT Not sure I understand the question. I'm reading it as asking if there are advantages to a physically loop backed reference signal versus a software loop backed reference signal. From a measurement perspective, no not really. In fact the additional delay of the software based solution could be problematic if using the measurement for timing purposes. The single biggest advantage to the software solution is the gained input. If you're using a two channel device and one input is being used to patch the output signal to an input, you are left with a single input for a mic. Thus you can only do one dual channel measurement at a time. Whereas with a software loop back you can use both inputs for mics and do two dual channel measurements at the same time. Given the cost of multi channel pre amps, this is a good way to move in to the multi measurement realm without having to invest in another device. -A [/QUOTE]

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