Okay, got my serial# for my TrueRTA.... The QuickSweep button is now enabled allowing me to do freq. response in one click.
[Quick Sweep] is a short digitally generated sweep (chirp) to measure the frequency response of electronic and acoustical systems.
And here is the result... each horizontal line is a 1dB difference. Scale shows -10dBu to +10dBu.
At 10Hz, we only rolled-off by what? about -0.5dB from the look of the graph?
20Hz to 20Khz is hugging the 0dB line very closely. Not even +/-0.25dB I would think.