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/usr/share/ambdec/presets/itu5.1-ord2-optim.ambdec is in ambdec 0.5.1-5.

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# AmbDec configuration
# Written by Makedec-0.8.0 at Sun Sep  4 22:31:12 2011

/description      Optimised ITU 5.1 decoder found by genetic search.

/version          3

/dec/chan_mask    11b
/dec/freq_bands   2
/dec/speakers     5
/dec/coeff_scale  fuma

/opt/input_scale  fuma
/opt/nfeff_comp   input
/opt/delay_comp   off
/opt/level_comp   off
/opt/xover_freq    600
/opt/xover_ratio   0.0

/speakers/{
add_spkr    LS     1.500    110.0      0.0    system:playback_1
add_spkr    LF     1.500     30.0      0.0    system:playback_2
add_spkr    CE     1.500      0.0      0.0    system:playback_3
add_spkr    RF     1.500    -30.0      0.0    system:playback_4
add_spkr    RS     1.500   -110.0      0.0    system:playback_5
/}

/lfmatrix/{
order_gain     1.00000  1.00000  1.00000  1.00000
add_row     0.420330  0.330200 -0.312250  0.019350 -0.027010
add_row     0.197700  0.288820  0.287820  0.049110  0.007420
add_row     0.058030  0.000000  0.205970  0.000000  0.050790
add_row     0.197700 -0.288820  0.287820 -0.049110  0.007420
add_row     0.420330 -0.330200 -0.312250 -0.019350 -0.027010
/}

/hfmatrix/{
order_gain     1.00000  1.00000  1.00000  1.00000
add_row     0.562520  0.273150 -0.216490  0.087300 -0.072220
add_row     0.327620  0.278030  0.287910  0.194760  0.041400
add_row     0.193300  0.000000  0.289720  0.000000  0.219660
add_row     0.327620 -0.278030  0.287910 -0.194760  0.041400
add_row     0.562520 -0.273150 -0.216490 -0.087300 -0.072220
/}


/end