Analyzer - Innosonix MAXX Series Manual

MAXX/HP²
Chapter 6. WEBSITE
6.6. CHANNEL SETTINGS

6.6.14. ANALYZER

The integrated impedance analyzer performs a continuous measurement of the
connected speaker impedance over the full frequency spectrum based on the supplied
music signal.
It's enabled when the sec_webpage_channel_power of the corresponding channel is
active.
The analyzer measures up to 32 channels simultaneously.
This is performed by using two 32k FFTs per channel for voltage and current, which are
divided through each other to calculate the complex impedance. Additional log
decimation and smoothing is applied afterwards to achieve a higher signal-to-noise ratio
even to estimate the spectrum with a relatively low output signal. Depending on the
output level, the measurement process may take some time. The higher the signal level,
the less time it takes to get valid results.
Since the music signal does not always contain enough information on certain
frequencies, a CONFIDENCE level indicates the level of trust that can be taken to certain
frequency bins. When the CONFIDENCE of a certain bin reaches 1.0, its indicated by
GREEN curve plot. The momentary output of the impedance analyzer is indicated by
GRAY colour and is present FYI.
Figure 35. Real Time Impedance
2023-01-05 | Rev. 3.17.0 6.6. CHANNEL SETTINGS | 60/86