You can use Y-cable splitters, but you will get 1 or 2 dBs of signal loss each time you split the signal. This would be defeating the whole purpose of surround sound however. Either invest in a pair of really good loudspeakers, or get a 5.1, 6.1, or ...
If you want to power car amplifiers using house electricity you'll need a high output power supply since the current draw of amplifiers will overload most available power supplies. The first thing to do is to get the power specifications for the amps...
It looks like you have done research or have been in car audio for a while to know about Autotek. You are correct that the company MAXXSONICS is now making the amplifiers has now for the past year or so takin over MB Quart. The Autotek brand of ampli...