Reddit mentions of Portta Audio Converter DAC Digital Coaxial or Toslink to Analog Stereo Audio R/L 3.5mm Converter Adapter Support PS3/4 Xbox Sky HD Plasma Blu-ray Home Cinema Systems AV Amps Apple TV

The easiest way I can think of is a toslink to RCA converter and the a RCA to 3.5mm cable.

I use something like this for my AppleTV (so I can use Airplay without TV on with my stereo)
http://www.amazon.com/Portta-PETDASMP-Premium-Digital-Converter/dp/B007S6U7I4/ref=sr_1_2?s=electronics&ie=UTF8&qid=1412771889&sr=1-2&keywords=toslink+to+rca

Haven't tried it with the FireTV. I'll give it a try tonight and tell you if it works. I don't know a usb head set will work, I tried a usb DAC that works with android with no luck. I would try looking at the xda forum for Amazon Fire TV

You want a toslink to RCA converter. Something like https://www.amazon.com/Portta-N3DASMP-Premium-Converter-Headphone/dp/B007S6U7I4 (first hit I found) but there are many out there.

I can't find the exact page, but this is the same one that comes with a TOSLINK cable.

Also I'm from Australia so you might find a better deal on Amazon or something

EDIT: Found one on Amazon

I do not know what you have but this
http://www.amazon.com/Digital-Optical-Coaxial-Toslink-Converter/dp/B007S6U7I4/ref=sr_1_3?ie=UTF8&qid=1405136588&sr=8-3&keywords=digital+audio+to+rca+adapter

and you might need this
http://www.amazon.com/Male-3-5mm-Stereo-Female-Y-Cable/dp/B000I23TTE/ref=sr_1_1?ie=UTF8&qid=1405136677&sr=8-1&keywords=rca+to+femail+to+3.5mm

http://www.amazon.com/gp/aw/d/B007S6U7I4/ref=mp_s_a_1_8?qid=1420073229&sr=8-8&pi=AC_SX110_SY165_QL70

I don't have a picture but it's this one: http://www.amazon.com/gp/aw/d/B007S6U7I4/ref=redir_mdp_mobile?keywords=digital%20to%20rca%20converter&qid=1409112900&ref_=sr_ph&sr=1

http://www.amazon.com/gp/aw/d/B007S6U7I4/ref=mp_s_a_1_1?qid=1410676348&sr=8-1&pi=SY200_QL40

Would that work?

Try this (using optical out from the Xbox itself): http://www.amazon.com/gp/aw/d/B003OND0N4?pc_redir=1398327977&robot_redir=1

Then plug this into your TB transmitter and device above: http://www.amazon.com/gp/aw/d/B0032JAG4G/ref=mp_s_a_1_7?qid=1398493800&sr=8-7&pi=AC_SX110_SY165_QL70

Then plug in the Xbox adapter into where your 360 "talkback cable" went.

Would be a lot easier if you had a TV with stereo out.

This is cheaper but you will need your own optical cable: http://www.amazon.com/gp/aw/d/B007S6U7I4/ref=pd_aw_sbs_4?pi=SL500_SS115

Honestly, I would just get a sound bar with digital coax in. You could also get a stereo amplifier with digital in, but it's pretty much the same concept as that converter but more expensive. If you don't want to buy a sound bar, you can get something like this: http://amzn.to/1lIUECM this will convert the coax digital out to analog to your speakers (and cheaper than the best buy one) or if you strictly want to amplify your console sound you can just buy that cable I linked earlier. You may need to buy a digital audio coax cable if you don't have one (http://amzn.to/OwwyQy) although I read you could use the video cable from the standard component set although it's not suggested.

[edit]
Thanks for the gold!

also rca converters - not all that expensive. not sure why you are worried about dolby? shouldnt matter, you're making a digital signal analog, the dolby stuff happens elsewhere in the chain

http://www.amazon.com/Digital-Optical-Coaxial-Toslink-Converter/dp/B007S6U7I4/ref=pd_sxp_grid_i_0_1

http://www.amazon.com/Digital-Optical-Coaxial-Toslink-Converter/dp/B007S6U7I4 this to 2 of thses http://www.ebay.com/itm/Female-RCA-Y-Splitter-2-Female-RCA-Combiner-Converter-Adapter-Jack-Ship-from-USA-/150668940541 and use one of these http://files.cablewholesale.com/hires/2rca-ste.jpg (to pc) and a headset on the other outputs

Most older receivers don't include an optical input. Many new ones do, but they will be much more expensive. If you have an optical out at the source (TV, BluRay, ect), you can get one of these to convert the signal.

I do not know of anything that will mix the TOSLINK (Optical Digital) along with all your other analog sources, but these Rolls mixers are good...

http://www.bhphotovideo.com/c/product/868713-REG/Rolls_MX51s_Mini_Mix_2.html

http://www.bhphotovideo.com/c/product/597819-REG/Rolls_MX22S_MX22s_Mini_Mix.html

You might need to use a TOSLINK (Optical Digital) to Analog converter box in order to include that source as an input to your mixer.

http://www.amazon.com/Digital-Optical-Coaxial-Toslink-Converter/dp/B007S6U7I4

Anything that can convert optical to RCA, e.g. this thing, should work. Since your speakers are wholly analog and only have inputs for a left and right channel, there is no discrete channel for the subwoofer. Instead, it'll use a low pass filter to send any signal below a certain frequency to the subwoofer, and a high pass filter to send signals above that frequency to the regular speakers.

For less messy amazon links you can extract the part after "/dp/" in

https://www.amazon.com/Portta-PETDASM-Premium-Converter-Headphone/dp/B007S6U7I4/ref=sr_1_1?s=aht&ie=UTF8&qid=1484918638&sr=1-1&keywords=speakers+with+optical

and make it:

https://amzn.com/B007S6U7I4

Or via smile link:

https://smile.amazon.com/dp/B007S6U7I4

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Here you go! This should open a lot of options up for you. Optical to RCA converter. Now you can use any set of speakers you like.

https://www.amazon.com/Portta-PETDASM-Premium-Converter-Headphone/dp/B007S6U7I4/ref=sr_1_1?s=aht&ie=UTF8&qid=1484918638&sr=1-1&keywords=speakers+with+optical

Note that it has a USB connection. That is just for power. You would plug that into any USB AC charger dongle thingy, or a powered USB port. (Your TV might have a powered USB port built in)

I haven't heard the CR3s. Reviews I've read have made them sound kind of like cheap computer speakers. Computer speakers typically don't sound great in an audiophile sense (they tend to have exaggerated highs and lows) but IMHO they're fine for TV; they'll be an upgrade over a TV's built in speakers at least and should sound better than a soundbar at the same price level. At the $75-ish price level a 2.1 Logitech setup might actually sound better but I'm just guessing.