Zektor Palladia™ 8X8 - Manual (Page 54)

54 HDA800(V2) Serial Protocol, Version 1.3, 9/12/13
Audio Control
For instance if you wanted to attenuate the audio by 24dB (the output level would be 24dB lower than
the input level), you take the gain of -24dB, multiply by 2, and add 200. So ‘vol = -24*2 + 200 = 152’,
and:
^VZ @1,152 -> Set the volume on zone 1 to -24.0dB
would set the volume gain on zone 1 to -24.0dB.
You can also easily add or subtract from the current volume in 0.5dB steps, for instance:
^VZ @1,+6 -> Increase the volume (make it louder) on zone 1 by 3.0dB
^VZ @3,-9 -> Decrease the volume (make it softer) on zone 3 by 4.5dB
‘VZ’ Volume Fading Examples
The HDA800(V2) volume can also be faded to new levels using a timed approach, or a dB per second
approach.
To fade to a new level in a given amount of time add 10000 to the volume setting (use the VRT com-
mand to set both volume fade time and/or fade speed. See “‘VRT’ Set Volume Ramp (Fade) Times”
on page 56). For instance, if the ramp time given to the VRT command is 20 (2 seconds) then:
^VZ @1,@2,10020$
will fade zones 1 and 2 to the a level of 20. Regardless of their current values, zones 1 and 2 will both
reach level 20 at exactly the same time. If one zone is farther away from 20 than the other, the fade
speed will be faster, so that both zones reach the new level at the same time.
To fade to a new level using a fixed fade speed, add 20000 to the volume setting. For instance if the
ramp speed given to the VRT command is 40 (20dB per second) then:
^VZ @1,@2,20010$
will fade zones 1 and 2 to the level of 10 at a speed of 20dB per second. The zone closest to 10 will be
the first zone to reach 10.
You can cross-fade, and mix the different types of fades in a single command. For instance:
^VZ @1,10000,@2,+20040,@3,35$
will fade zone 1 to the mute level of 0, using a timed ramp. At the same time zone 2 will fade up 20dB
(40 steps) using a fixed ramp speed, and zone 3 will jump immediately to level 35.
All fades are interruptable. If you issue a new volume command while a zone is in the process of fad-
ing, it will simply begin fading to the new level from its current mid-fade setting.
‘VMIZ’ Set Zone’s Minimum Volume
Each zone has a minimum and maximum volume setting.
The maximum prevents a user from overdriving the speakers, amplifier, or even the HDA800(V2)
switch.
The minimum allows you to set the volume to just below the noise level of a quiet room. The volume
setting HDA800(V2) can be adjusted down to -99.5dB before muting. This is usually quite a bit
beyond the noise level of any room, or the noise level of most amplifiers. Since adjusting the volume
below the noise level is just a waste of time, the minimum level allows you to limit the volume range.
Attempting to set the volume below the minimum level will cause the HDA800(V2) go into full mute
(no sound). When adjusting the volume upward from full mute, the volume will immediately jump to
the minimum level.