Sony STR-DA5800ES - Manual (Page 15)

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DTS-ES
Lights up with one of the following
indicators, depending on the input signal
decoding format.
96/24
DTS 96/24 (96 kHz/24 bit) decoding
DISC
DTS-ES Discrete 6.1
MTX
DTS-ES Matrix 6.1
wj NEO:X
Lights up when DTS Neo:X Cinema/
Music/Game decoding is activated.
wk V.FH
Lights up when the Virtual Front High
feature is enabled so that the sound output
from the front speakers can be virtually
reproduced, even in an environment
without front L/R speakers.