STA309A
Registers
Doc ID 13855 Rev 4
41/67
Input channels must be mapped using the channel-mapping feature in the following manner
for bass management to be performed properly.
1: left front
2: right front
3: left rear
4: right rear
5: center
6: LFE
When AMBMXE = 1, biquad #7 on channels 1-6 are utilized for bass-management
crossover filter, this biquad is not user programmable in this mode. The XO settings
determine the crossover frequency used, the crossover is 2
nd
order for both high-pass and
low-pass with a -3 dB cross point. Higher order filters can be obtained be programming
coefficients in other biquads if desired.
It is recommended to use settings of 120-160 Hz when using small, single driver satellite
speakers as the frequency response of these speakers normally are limited to this region.
7.2.34
AUTO3 - Automode™ AM/prescale/bass management scale (0x21)
Table 58.
CSS and RSS bits
Bitfield
10
01
00
CSS - center speaker size
Off
Large
Small
RSS - rear speaker size
Off
Large
Small
Table 59.
FSS and SUB bits
Bitfield
1
0
FSS - front speaker size
Large
Small
SUB - subwoofer
On
Off
D7
D6
D5
D4
D3
D2
D1
D0
AMAM2
AMAM1
AMAM0
AMAME
Reserved
MSA
AMPS
0
0
0
0
0
0
0
1
Table 60.
AMPS bit
Bit
RW
RST
Name
Description
0
RW
0
AMPS
Automode prescale
0: -18 dB used for prescale when AMEQ is not 00
1: user defined prescale when AMEQ is not 00
Table 61.
MSA bit
Bit
RW
RST
Name
Description
1
RW
0
MSA
Bass management mix scale adjustment
0: -12 dB scaling on satellite channels in Config #1
1: no scaling on satellite channels in Config #1