The Spectrum graph page offers a spectrum analyser plot with resolution
of up to 0.3Hz or Real time Analyser (RTA) plots with resolutions up to 1/48th
octave. It calculates THD and THD+N distortion figures and shows the relative levels
of the 2nd to 9th harmonics of test tones. It allows high resolution measurement of
system responses without having to connect to the system being measured by either
playing a pink noise signal through the system or, for much more precise low frequency
measurements without the very long averaging required for pink noise, playing the new
pink periodic noise signals from REW's own signal generator saved as WAV files.
More details...
The RT60 graph page shows reverberation times in octave or one-third octave bands
calculated in accordance with ISO 3382. Related plots for the current measurement,
including the Schroeder curve used to derive the RT60 figures and the linear fits
for the various RT60 parameters, can be viewed on the Impulse graph page. The
Impulse page also allows an octave or one-third octave band filter to be applied
to the current measurement and the associated frequency responses.
More details...
The waterfall and Spectral Decay plots now span the full range of the measurement. The
waterfall controls have also been revised and extended and offer further control over the
plot.
A loopback connection on the left soundcard channel can be used to provide an automatic
calibration reference settings as an alternative to using a soundcard cal file. This has the
advantage of removing the soundcard's influence from the impulse response as well as the
frequency response (the calibration file method only corrects the frequency response) and
allows measurement of the delay through the system being tested, useful for checking or
setting speaker distances. More details...
The measurement panel now allows the start of the sweep to be specified as well as
the end, allowing convenient measurement of equipment that is not tolerant of low
frequencies (tweeters, for example).