Specifications
EAW Smaart 6 Operation Manual Analysis Modes and Display Types
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The Signal Level/SPL readout tracks the channel designated as SPL Source in the
Audio I/O tab of the Options dialog. When Smaart 6 is calibrated to SPL, the readout
can be set to display an A-weighted, C-weighted, or flat (unweighted) SPL value based
on the current FFT frame (only) or an average of the data from some number of the most
recent frames.
The label on the button immediately above the numeric readout displays the current
units/weighting, calibration type, and time integration settings for the readout as applicable.
Clicking this button opens the SPL/Calibration options dialog where these parameters
are set.
When Smaart 6 uses its default Full-Scale calibration scheme (based on the full scale of
the current input device’s A/D converter), the top line of this field displays dB Full Scale.
If Smaart 6 is calibrated to SPL (or some other external reference) this notation changes
to SPL. The weighting curve currently selected (standard A, B, C, and Flat (unweighted)
appears first, followed by the SPL integration time (Fast, Slow, or Impulse). Figure 3-12
shows the display for SPL calibration with A-weighting and Fast integration time.
Figure 3-12 Units/Options button at the top of the Signal Level/SPL Readout
The Fast and Slow integration time options emulate time integration circuits in standard
hardware sound level meters as closely as possible. Smaart 6 now has the time resolution
to model ANSI/IEC standard Impulsive (Imp) integration as well (replaces the version
5 Inst option).
Click the Units/Options button above the Signal Level/SPL readout to open the SPL/
Calibration Options dialog box that allows adjustment to signal level readout parameters
and/or recalibration of Smaart 6. Note that some SPL options are disabled when Full
Scale calibration is active. Also note that the Peak Hold option is unavailable when
calibrated to SPL (or other external reference).
3.4.2 Calibrating to SPL
By default, Smaart 6 is calibrated to A/D full scale, treating 0 dBFS as the maximum
magnitude produced by the sound hardware’s A/D converter. Therefore, given a sine
wave with an amplitude equal to the maximum input voltage of the A/D converter, the
RTA display shows a 0 dB peak at the sine wave’s frequency.