See how they've fudged it?

They've said that the unit does supply 5.1 Audio in MPEG and 5.1 Audio in DD - but why keep mum about DTS? My suggestion would be to check thoroughly before you buy. I get the feeling that Sony may be able only to down mix DTS to 2.0, if at all.
Thanks for pointing that out. As reputed company Sony should come clear about the right specification of their products. Sony is trying deliberately to confuse the customers who are not so well informed about the technology. As I have noticed that there is not a single DVD player from both Sony and Philips which can be termed as ideal.
Model No : Sony DVP-SR650P
SYSTEM
Single / Changer Yes /
DVD-Video/CD/Video CD/SVCD Yes / Yes / Yes / Yes
CD-R/RW Yes / Yes
MP3 (CD-R/RW) Yes / Yes
JPEG (CD-R/RW), Kodak Yes
DivX (CD-R/RW) Yes / Yes
AAC (CD-R/RW) Yes / Yes
WMA (CD-R/RW) Yes / Yes
LPCM (CD-R/RW) Yes / Yes
MPEG-1 (CD-R/RW) Yes / Yes
Simple MPEG-4 (CD-R/RW) Yes / Yes
DVD+RW/+R/+R DL (Video) Yes / Yes / Yes
DVD-RW/-R/-R DL (Video) Yes / Yes / Yes
DVD-RW/-R/-R DL (VR) Yes / Yes / Yes
MP3 (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
JPEG (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
DivX (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
AAC (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
WMA (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
LPCM (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
MPEG-1 (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
Simple MPEG-4 (DVD-RW/-R/-R DL/+RW/+R/+R DL) Yes / Yes / Yes / Yes / Yes / Yes
MP3 (USB) Yes
JPEG (USB) Yes
DivX (USB) Yes
AAC (USB) Yes
WMA (USB) Yes
LPCM (USB) Yes
MPEG-1 (USB) Yes
Simple MPEG-4 (USB) Yes
DVD/CD Text Yes / Yes
Twin Laser Pick Up Yes
Dynamic Tilt Compensation Yes
DivX Playback Yes
VIDEO
Progressive Scan (PS) Yes
Video DAC 12bit/108MHz for philips 12 bit, 108 MHz
Video Equaliser Yes (Picture, Brightness, Color, Hue)
Sharpness Yes
Custom Picture Mode Yes
High Speed Search Yes
Instant Replay Yes
Instant Advance Yes
Fast/Slow Play with Audio Yes
NTSC / PAL Yes / Yes
Color Default Setting PAL (C)
TV Type Default Setting 16:9
Audio
Audio DAC
192kHz/16bit for philips model : 24 bit, 192 kHz
DD/DTS/MPEG Digital Output Yes / Yes / Yes
MPEG 5.1ch Output Yes
DTS Yes
Dolby Digital Output Yes (5.1ch)
Digital Output (Linear PCM) 96kHz/24bit
TV Virtual Surround (TVS) Yes (Standard, Dynamic, Wide, Night, Dynamic Theatre)
CONSTRUCTION
Front Panel Mold (Low)
Design MIDI
Union Jack FL Display Yes
Width (mm) 320
Height (mm) 32
Depth (mm) 209
Weight excl. carton (kg) 1.2
Function
Control Menu Yes
Background Graphics Yes
Screen Saver Yes
Child Lock Yes
Quick Set Up Yes
Multi-Disc Resume 6 Discs
Title/Chapter Viewer Yes
Auto Power Off (Default) Yes (OFF)
Power Resume Yes
MP3 ID3 Lyrics Yes
I/O
Composite Video Output 1
Component Video Output 1
Analog Audio 2ch Output (L,R) 1
Coaxial Digital Output 1
USB 1
ACCESSORY
AV Cable Yes
Instruction Manual Yes
AA Battery 2
One Year Warranty.