62
HDA800(V2) Serial Protocol, Version 1.3, 9/12/13
Audio Control
Each zone has a 5 Band Equalizer associated with it, each of the five bands have levels that range from
-20.0dB to +20.0dB. Interaction between the Bass and Treble controls and the 5 Band Equalizer set-
tings are limited to a +/-20.0dB range. Adding a boost of +20.0dB to the Bass setting as well as the
EQA or EQB equalizer bands, will not result in a +40.0dB, but will be limited to +20.0dB.
The levels are set in -0.5dB steps.
The band center frequencies for each command are:
EQ1Z -
100Hz (and below, this is a low frequency slope filter.)
EQ2Z -
330Hz
EQ3Z -
1,000Hz
EQ4Z -
3,300Hz
EQ5Z -
10,000Hz (and above, this is a high frequency slope filter.)
Only the ‘EQ1Z’ command will be described, all the bands use identical syntax.
Command format:
^EQ1Z @
zone
,@
zone
,
level
Set the EQ level of a zone or zones.
^EQ1Z @
zone
,+
step
$
Add ‘step’ number of 0.5dB steps to current EQ level.
^EQ1Z @
zone
,-
step
$
Subtract ‘step’ number of 0.5dB steps from current level.
^EQ1Z ?$
In polled mode, reads current settings of all EQ changes.
^EQ1Z @
zone
,@
zone
,?$
Read current EQ level settings of given zone(s).
Response String:
^=EQ1Z @
zone
,
level
$
Where:
@
zone
= One (or more) zones to be affected.
level
= Levels 0.5dB steps with offsets of 128 (128 = 0.0dB).
The levels in the commands are given in 0.5dB steps and use an offset of 128 to indicate a boost / cut
of 0.0dB. Values above 128 boost level by 0.5dB per step, for instance 129 = +0.5dB (a boost of
0.5dB), and 127 = -0.5dB (a cut of 0.5dB).
‘EQ1Z’ Examples
Examples are only given for the EQ band-1 command ‘EQ1Z’, for other bands, substitute the proper
command for the desired band. The simplest form of the command is:
^EQ1Z @1,128$
and causes the EQ level on zone ‘1’ to be set to 0.0dB which is flat (no boost or cut).
The easiest way to use the equalizer settings on the HDA800(V2) is to know that 168 is full boost, and
88 is full cut and every step from 88 to 168 boosts the EQ level by 0.5dB, with 128 used to indicate no
boost or cut.
Or you can set a zone to an absolute level, in decibels, by taking the gain (which is positive for boost
and negative for cut), multiplying by 2 (to take into account the 0.5dB steps), adding 128, and using
that as the new level.
For instance if you wanted to boost the EQ level by 9dB, you’d take the gain: 9dB multiply by 2 and
add 200. So ‘level = 9*2 + 128 = 146’, and:
^EQ1Z @1,146
->
Boost EQ band’s level by 9.0dB
would set the EQ level on zone 1 to a 9.0dB boost.
You can also easily add or subtract from the current level in 0.5dB steps, for instance:
Summary of Contents for HDA800
Page 1: ...HDMI Matrix Switches HDA800 HDA800 V2 User Guide ...
Page 2: ......
