Based on principles from the Smaart v9 User Manual (Rational Acoustics)
By default, the spectrograph shows 20Hz-20kHz. Change this to 20Hz-10kHz immediately. The manual doesn't tell you that the top octave (10k-20k) is almost always irrelevant for system tuning and just adds visual noise. Zoom in on the speech frequencies (100Hz-8kHz) for a "better" view. smaart 9 manual better
Most measurement failures happen before you even press "Start." Based on principles from the Smaart v9 User