Which analyzer method allows viewing sound spectrum in both frequency and time domains?

The Dual Channel FFT (Fast Fourier Transform) Analyzer is the correct choice because it provides a comprehensive analysis of sound by allowing users to visualize both the frequency and time domains simultaneously. This capability is crucial when measuring and analyzing audio signals, particularly in complex environments or during live sound applications.

With a Dual Channel FFT Analyzer, the user can capture audio signals in real-time and display how these signals transform across different frequencies over time. This dual perspective is essential for identifying issues like frequency interactions, phase issues, or time delays that might affect audio quality. The FFT analysis itself is a mathematical technique that converts time-domain signals into their frequency components, enabling a detailed assessment of how sound behaves.

In contrast, other methods such as the RTA (Real-Time Analyzer) primarily focus on frequency analysis and may not provide the same depth of time-domain analysis. Gain Structure relates to optimizing the levels of audio signals at various points in a system, while Signal Flow Analysis focuses on the routing and connectivity of audio signals without specifically measuring their frequency and time characteristics. Thus, the Dual Channel FFT Analyzer stands out for its ability to deliver an integrated view of sound behavior in both frequency and time domains.