Datasheet

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
00000001
Table 60. AMPS bit
Bit RW RST Name Description
0RW0 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
1RW0 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