Sorry about the quality of my English not my first language
a/ How is to hear DTS X with 7.1 speakers ?
b/ Why you not invest in" Network Audio Formats" ?

on sc- 57
Your formats out of date Examples:
LPCM- Maximum 48 khz 2 ch 20 bit (in your sc- 57 )
When there are newer Format to "lpcm " 96 khz 8 ch and 24 bit
How can I pay a FOR receiver $ 2,100 with old technology?
Can you fix it with " firmware" ?
AAC – Maximum 48 khz 2 ch 16 bit (in your sc- 57 )
When there are newer Format to " AAC AND HE-AAC " Why not you give us new formats ?

AAC supports up to 96 kHz
aacPlus - Bitrate of 448kbps for 5 channel surround
Can you fix it with " firmware" ?
WAM 9 - Maximum 48 khz 2 ch 16 bit (in your sc- 57 )
When there are newer Format " Windows Media Audio Professional"OR
Windows Media Audio Lossless

support audio resolutions of up to 96 kHz and up to eight discrete channels (7.1 channel surround).
Why should I pay $ 2,100 on a new receiver with older formats