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FM-531HD / May 2013
F M - 5 3 1 H D P R O G U I
While the two settings may appear to be almost the same, because the transition am‑
plitude is 1dB greater on the soft setting there is a
significant
difference in how the two
VBMS transfer functions
sound on actual program material.
Output
The VBMS
Output
control adjusts the output of the VBMS algorithm and can be
thought of as a “low bass mix” control. Settings higher than 0.0dB add more bass sound
to the overall mix, while settings lower than 0.0dB reduce the amount of bass. Both
the VBMS
Drive
and the VBMS
Output controls may be generally adjusted to taste.
However, care should be exercised in the setting of the VBMS Output control because
settings above about +2dB may cause the amplitude of bass to reach the final limiter and
added distortion may result. Like VBMS Drive, the VBMS Output is adjustable over a
range of +/‑ 6dB
VBMS Frequency
The VBMS
Freq
control tunes the VBMS algorithm’s
frequency of operation from 80Hz to 300Hz with the
program energy that is not passing through the algorithm
time aligned for coincidence regardless of the settings.
VBMS Metering
There are two ways to monitor the amount of process‑
ing being done by the VBMS.
VBMS can be seen on
the Analysis Screen on the
Pro GUI or in the Guru GUI.
VBMS can also been seen in
Pro GUI in the Limiter gain
reduction graph. Its activity is
indicated by the yellow line.
Depending on how hard the
VBMS is driven, one may or may not observe much activity on the VBMS metering. In
fact, only when a lot of bass is present in source material will VBMS show any activity
on the meters. This does not mean VBMS is not working or acting on the audio.
Digital Output
The Digital Output control adjusts the precise peak audio signal
level at the HD Limiter of the FM‑531HD. The resulting peak out‑
put levels in dBFS are indicated by the front panel and remote GUI
bargraph meters. This control can be set to OFF or adjusted over the
range of ‑79.95dBFS to 0.00dBFS.
Summary of Contents for FM-531 HD
Page 2: ...Technical Manual Wheatstone Corporation May 2013 FM HD Digital Audio Processor FM 531hd...
Page 122: ...page A 2 FM 531HD May 2013 A P P E N D I C E S Appendix A General Specifications A 3 Contents...
Page 128: ...page A 8 FM 531HD May 2013 A P P E N D I C E S Appendix B FM 531HD GPI Interface A 9 Contents...