Yamaha receiver RXV375, I have surround sound with blue ray and tuner/radio. But with the TV (Samsung) only sound out of front speaker, can't get surround sound with TV.
Each input on a receiver can have it's own preferences (settings). My guess is that if you have a two channel analog input and have surround sound, you have on an artificial setting to mimic a multi-channel source. If your TV's output is just a two channel out and you want the same thing, do the the following.
Turn your receiver to the tuner input and see what setting it is on (what effect is employed). Then, go back to the TV input on the receiver and change your sound setting to match that. Now, I should say that each input may sound better with different settings/effects, which is why they allow different settings for each input. But doing that, will give you a starting point.
On the other hand, the receiver is likely choosing a digital multi-channel setting for the bluray, as it has a multi-channel signal coming thru the HDMI or optical cables.
Some receivers aren't all that intuitive when it comes to changing the sound settings/ effects, that's when you pull out the manual.
If it's too loud, you're too old!!!