well, sorta...
I am considering purchasing the Onkyo HT-S3100, but noticed there are no HDMI In/Outs on the receiver. I currently have my cable box, PS3, and DVD player all use HDMI connections. Is it true that I can keep all of these connected directly to my TV,...
Stop right there!
First, the good news. So far, so good. This will assure that the TV gets the pure, unadulterated video signal from the HDMI equipped unit. You'll, of course, have to use the TV for the video switching device.
... and then just simply connect from my TV to the receiver via a Toslink cable so that all audio goes through the receiver? Is it really that simple or am I missing something?
Now the bad news. Ever heard the term "if it seems too good to be true it probably is"? This is a perfect example.
From what I've seen, that toslink output on he TV itself does not "pass thru" audio from external sources. It only outputs what the TV's internal tuner generates. But, things do keep changing in this hobby. RTFM
You'll have to run a separate audio link (coax, toslink, analog, whatever it takes) from the other source units directly to the receiver. And, of course, you'll have to select the audio from the receiver.
What you suggest will probably work if you use the two channel red/white analog audio outputs from the TV, but somehow I think you want more than that. I would.
Ultimately I want to make sure I can still use my HDMI connections while using the audio from this receiver.
Using the above schema assures that. Switching may not be quit whatyou liked, but sometimes compromised must be made. At least here you lose nothing, quality wise.