How do you turn the sub unit on?

SOURCE: I have purchased a samsung 46 inch LED television.

You may have to go into the bose setup and select optical in for that particular input. Check your user manuel it should say in it.

SOURCE: sound comes only fron one rear speaker

Did you try switching Speakers A and Speakers B button on the AV receiver?

SOURCE: I am looking to upgrade my receiver to an audio

I just went thru the same situation, I have a set of 901's and a set of cerwin vegas that I have always enjoyed powering up along with a 18 sub, gotten a little older and dont playing like I use to, anyway, I wanted to upgrade my system and keep everything HD and utilize the HDMI connections as much as possable, I purchased the HK AVR 354 7.1 (harmon Kardon) Tech support helped me with the hook up for the 901, had to run another amp off the pre out for the front speakers off the HK to the Bose eq amp in then eq amp out to amp in where the front speakers will be hooked up (901's) I had a kennwood 2 channel 100w amp that has worked fine, then you can continue to hook up the rest as you want, check it out.. It has worked for me.. good luck , Chris

SOURCE: I just installed a Bose Cinemate II system. HDMI

No,you are not mistaken actually.I really don't have much to offer though.I just want to let you know that I have seen many problems with HDMI cables and no sound.HDMI does in fact transfer audio/video.Even though I do not like to use Wikipedia because anyone can edit the info,I check and see if it is accurate first and does give the best descriptions and is the quickest and easiest to find.This is a newer technology.Any new technology is usually not figured out until about year 5.In year 3,they are able to get the kinks worked out,but year 4 is already in production.They start designing and building the best version for year 5 next.Although 5 years isn't always achieved,it is more of a minimum to see the best possible of the technology.Happens with cars,TV's,VCR's,etc.Prices come down as everyone who wants it is greatly reduced by then also.Anyhow,here is a link to some info about HDMI.Scroll down to Communication channel protocols.Under TMDS there is some relevant info.You may not understand the terminology but basically it seems that there is an internal automatic muting with certain changes in the audio signal.It just sounds to me like the automatic mute is too sensitive right now and will improve over time.There is also some encryption taking place which is basically taking the output,scrambling it,sending it somewhere,and then being unscrambled and reproduced identically.Same as wireless internet.With all the various products being used,everyone has their own way of doing something.Since it isn't exactly made with exact specifications,there are many variations to interpret.If someone were to have ALL components made by 1 company,it would most likely work much better.How many people have that kind of setup though?Very few.There is not 1 company which makes everything they produce,better than everyone else's.Some make better radios,some TV's,etc.Right now,some of the better TV's are Samsung,LG,Vizio.Some better phones are AT&T,Panasonic.Bose has been at the top of the food chain for years for audio for that reason also.They do audio,nothing else,so they can put everything into it.I know this is a bit wordy but that's why I am here.To inform and educate people about things which they most likely don't understand and encourage them to spread the word.Hope you understand this anyhow.Basically,depending on how old your PS3 is,there may be compatibilty issues.With HDMI changing/upgrading rapidly,if your PS3 is an earlier version,it could simply be compatibility because PS3's even were changed as they sold more.If you have any questions or need more help,just comment here and I will get an autolink to your post and reply ASAP.Here is the link for HDMI characteristics/operation.Good luck,Greg

http://en.wikipedia.org/wiki/HDMI

Testimonial: "Thank you for your response. I was able to get audio for my PS3 by connecting an optical cable from the PS3 to the Cinemate interface module."

SOURCE: I have a Bose Cinemate

If you're using a Cinemate for HDTV listening you're missing out on multichannel sound. However, since it only supports analog 2-channel audio AND a TV or monitor is NOT a meaningful contributor to the listening experience, maybe you could extract the TV audio from the cable box where it ultimately originates in the first place. I'm sure it has a convenient and compatible RCA pair.