Specifications

EAW Smaart 6 Operation Manual Analysis Modes and Display Types

Figure 3-11 Delay auto-locator buttons

Default settings for the Auto Sm and Auto Lg yield time windows of approximately

300 ms and 3 s, respectively. The Auto Sm default is appropriate for measuring delays

through electronic devices or acoustic measurements in small and medium rooms. The

default for Auto Lg is sufficient for acoustic measurements in medium and large rooms

but may need to be increased for measurements in very large or particularly reverberant

spaces. The size of the small and large time windows is determined by the sampling rate

and FFT sizes selected on the Impulse/Locator tab of the Options dialog.

The automatic delay locator is primarily used to find and compensate in for the time offset

between the reference and measurement signals in Frequency Response measurements,

although it can certainly be used for other purposes. After the Auto Small or Auto Large

routines run, a dialog appears to insert the signal delay found into the reference channel.

This dialog also displays the absolute polarity of the impulse response. The impulse

response polarity can determine the polarity of a single driver but may be misleading

when measuring multi-driver cabinets.

3.4 SPL Measurements

Smaart 6 receives its digital signal from the input device’s A/D section but with no

knowledge of the A/D converter’s voltage range or signal chain gain structure prior to

this point. To make accurate SPL measurements using Smaart, the analyzer must first

be calibrated to an external reference.

3.4.1 The Signal Level/SPL Readout

The top-right of the main window (above the Input Level Meters) displays the numeric

amplitude of one of the two input signals. In Real-time mode with Smaart 6 calibrated

to SPL, this readout emulates an ANSI/IEC standard Sound Level Meter (SLM).

NOTE: SPL measurements are valid only if Smaart 6 is calibrated to SPL (see page

57). Because this readout monitors only one input at a time, it should represent

the input channel carrying a mic signal when measuring SPL.