Question 1

the optical splitter won't fit into a bose sound bar

Accepted Answer

Well this specific splitter never worked at all for me , it’s junk... look at your local Walmart they sell one cheaper for a third of the price .. also it should plug into the source and then split the signal

Question 2

will this from from ps4 to pc/ astro a50 headset?

Accepted Answer

I don’t do ps4.  But one might think that if you can get sound t tv you can then optical/toslink into down stream headphones like I did with the sennheiser 175

Question 3

I need one out from TV and connect to speakers and headphones at the same time and just use one at the time. Will it work?

Accepted Answer

I use it for the same reason.  So I have I plug this into the tv optical input and then my soundbar and Bluetooth headphones go into the other.  In doing this, I can have the soundbar and headphones working at the same time.  If I want to use the headphones only, I just shut off the soundbar.  Sometimes I will play the TV low, and use the headphones to pick up any quiet audio in a movie so that I am not waking up the whole house.  Hope this helps.

Question 4

What am I missing? I hooked up a soundbar and headphones which are outputs from the tv but it doesn't work.

Accepted Answer

Unplug the fiber-cables at the soundbar and at the hedphone box.  Look at the dangling tips of both fibers. Each end should be glowing with a little spark of red. 
Just one fiber-cable from TV (no splitter) should glow just a tiny bit brighter.  If not the TV isn't doing its part yet.

If the red lights are ok, make sure the TV is sharing its sounds over the fiber:
Turn on your TV and change channel to something which makes predictable noise, maybe a news show.
Then, on your TV's settings menu, check the audio output settings.  It may say things like:  { (#1) internal speakers only, (#2) digital optical fiber output, (#3) both }. I would choose (#2). That way the sound definitely transmits into the fiber, and the TV itself is not making distracting noise.

Make sure the soundbar by itself is working (no headphones):
 The fiber-cable that goes to the soundbar, take its other end out of the splitter, and take the splitter pigtail-cable out of the TV, and plug the fiber-cable end into the TV. Play with the soundbar's buttons until it carries the TV's sound.  Then re-insert the splitter.  If re-insertion makes the sound stop, then this simple all-optical fiber-splitter will not work for your particular devices.

Do a similar test for your headphones.

ASIN	B07BKQVB8N
Best Sellers Rank	#9,427 in Audio & Video Connectors & Adapters
Brand	ZEXMTE
Color	Fiber Splitter 1 in 2 out
Compatible Devices	Tablet
Connector Type	Optical
Customer Reviews	4.1 4.1 out of 5 stars (4,409)
Finish	Gold
Item Dimensions	1.5 x 0.2 x 1.5 inches
Item Weight	8.53 g
Manufacturer	ZEXMTE
Mfr Part Number	ZEX0005
Model Number	8541770541
Number of Items	1
Number of Ports	3
Package Quantity	1
UPC	785004235787
Unit Count	1 Count

Optical Fiber Splitter 1 in 2 Out Optical Audio Splitter with 24K Gold Plated Connectors for CD Player, DVD Player, Receiver-Black

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