Can xbox 360 be connected to suuround sound

Connect the sound outputs from all the satellite box and the xbox to the sound inputs on the back of the ht-4500. Do not connect the tv sound output to the ht. As an example of the connections see this:
http://www.dummies.com/how-to/content/hooking-up-xbox-360-sound.html

If you have cable/FiOS TV/SATV,than you will have to connect a digital(fiber optic SPIDF or RCA type) form the set-top box to the suuround-sound system to get TRUE surround sound.I haven't come across a TV with this ouput,but not sure if some do.(If you use RCA analog audio cords from the ouput of theTV itself to an input of the sound system it will work,but it will be a glorified stereo sound,not true surround sound.

OK - Forget the surround system.

Connect the Xbox360 directly to the TV using the component cable. When you do this does the buzz remain?

This should give you a step by step direction to your needs: http://www.dummies.com/how-to/content/hooking-up-xbox-360-sound.html

Connect audio out cables (L and R) from HDTV to far left audio input at back of hts 3555. Then connect HDMI output from XBOX360 to HDMI input slot on TV. Setup XBOX 360 for audio through HDMI turn TV off and then on and all should be good. It worked for me.

If your TV is HD, you should definitely be connecting the component video cables (green, blue and red) from the 360 to the TV (the 321 will not do video pass-thru from component cables). -Make sure you have a picture at this point. (TV switched to whichever input you connect the 360 to)
You can get an RCA extension cable for the audio portion (red and white) to connect to the 321 for audio. You could also connect an optical audio cable to the 321. An optical cable must be assigned from the system menu to work..
Let me know if this helps.

no, there's no firmware upgrade that you can do on the tv. the reason for that is because you are sending digital sound to the tv with hdmi from xbox 360,and when you have rca cables connecting your tv and surround sound, the rca cables provide stereo sound. what you need to do if you want to use hdmi is connect optical cable from tv orxbox 360/ or tv to your surround sound to get digital sound, and it will sound better digital sound.

If you want to play 5.1 sound, and you got to need this fiber optic cable(black single cable)..with reciver decoder with optical on IN, to connect the xbox 360 machine on, and the high defintion cable of the xbox.

well u have to use tv rca out to a input on this system ok then select input 1 aux in ect on sound system ok