The already installed speakers are 4 ohm car speakers and are incapable of handling real power and may blow the output transistors of home 120V receivers designed to power 8 ohm loads (though some more expensive home receivers are capable of 8 ohm loads). 5.1 receivers are virtually out of production today in favor of 7.1 models. For a greater selection of features and price...suggest you look at 7.1 and just wire up 5.1 if you don't want sides and rear effects.
I would further suggest that you understand that a 5.1 set up will ONLY give you effects from the second pair of speakers so you may wish to consider if you want full sound spectrum only up front ...or if a receiver with the ability to power a pair of "B" speakers for another room is needed.
I strongly suggest replacing the car speakers ... both for compatibility as discussed above AND because $3 speakers suck. If you don't...buy a cheap receiver as you won't notice any difference anyway.
I understand a TV will get hooked up. So this means a blue ray player will not be hooked up. A video game will not be hooked up. An Ipod will not be hooked up, a usb stick will not be hooked up a radio will not be hooked up and the surround sound digital audio from a satellite dish will not be hooked up. Right? Exactly WHAT from the TV will be hooked up? HDMI output, Composite audio and video, component video/audio, digital optical audio out, coaxial digital audio out?
2015 Georgetown 280DS
2014 Vespa LX150 2014 StellaAuto 125