Yes

Frequency Range: 3-100,000 Hz
Impedance: 16 ohms
Sound Pressure Level (SPL): 98 dB (This was all in the specifications on the product page by the way)

They come with two cables both are on the shorter end. 3.5mm 4 pole to 3.5mm 4 pole angled with an in-line mic, and 3.5mm 4 pole to 4.4 pentacon. There is a small surround where the cables plug into the headphones, but the cables are standard so yes you can just make sure the cable you buy doesn’t have a large surround for the connector.

As long as you have speaker terminal outputs or have a receiver for the TV. I would suggest running an external receiver since these are passive speakers, and most TV's that size do not have amplified speaker outputs. If you think you want to eventually build a surround sound system I would suggest getting a Onkyo or Dennon receiver, and adding speakers as you go along. If you only want Stereo audio I would suggest getting a FiiO d3(also listed as the FiiO Taishan) and a Yamaha 200w Stereo receiver. If you go the Yamaha route you will probably have to buy the FiiO from another source, but it will convert optical audio to RCA which you will need to send signal to the Stereo receiver.

I'm not quite sure what you're asking, but I'll take a shot with what you've typed. I think your best bet is to get a multi-zone surround sound receiver. and have wire run through the wall as your second zone. A surround sound receiver should be able to accommodate the signal from your TV, CD-Player, and anything else you want to play through it while providing ample amplification for as many speakers as you want. You don't have to use all of the channels on the amplifier. With the vagueness of your question I'd suggest having a professional come help set everything up. I think you might be better off getting an independent home audio/home theater technician for your job unless your Best Buy in your area has a specific home theater/audio technician that they work with since it sounds a bit more involved than the average job I've seen geek squad sent out for. To make the wiring job easier I've suggested a Denon Heos reciever and Heos link box which can expand into your other listening area on the other side of the wall if you want to try this without a professional installer and are comfortable with setting everything up yourself. The Heos link box should be able to receive the signal from the main receiver and amplify the signal on the other side of the wall without having to wire between the walls.