Reddit reviews UGREEN 3.5mm Female to 2 RCA Male Stereo Audio Y Cable Adapter Gold Plated Compatible for Smartphones, MP3, Tablets, Home Theater (0.65FT)

It sounds like you need one of these?
RCA Audio Piggyback Cable
Or these?
RCA Y Splitter Adapter
Then go with one of these.
RCA to 3.5mm female
You will need amplified headphones also. You can power the headphone from the usb on the TV or use a USB wall block.
If this won't work for you it should get into the right area to search for something along these lines.

Do I need anything more than an RCA to 3.5mm (female) adapter cable to use my headphones with a jack-less TV?

I'm trying to hook up my Audio Technica M40x headphones to the TV when watching movies late at night. The TV (Hitachi LCD, model no. L40a105a) does not have a headphone jack, but it does have RCA output. So I bought this adapter, plugged it in, and...

It didn't work.

Am I doing something wrong, missing a step (e.g., changing a setting in the TV menu), or in need of another piece of equipment?

I had to leave the house for work shortly after I started troubleshooting and would like to have a better idea about how to solve this issue when I get home later tonight. I haven't been able to find any help so far, even after extensive Google searching and asking co-workers.

I don't have particular experience with RCA, but 3.5mm. As 3.5mm dongles exist and are known to work well and RCA is the same technology (i.e., in terms of chips used). I'd say purchasing the adapter you linked therefore is relatively safe, given the relatively reasonable price. Otherwise as you said, just buy a 3.5mm dongle and an adapter like this one https://www.amazon.com/dp/B00B2HP1FY. Or consider a Bluetooth receiver with a line out - depending on your circumstances this may be even more feasible.

You’ll want an adapter like this: https://www.amazon.com/UGREEN-Adapter-Compatible-Smartphones-Tablets/dp/B00B2HP1FY

Like the others said you can connect your speakers to your monitor in case it has an audio output. You could also use a HDMI Audio Extractor with an additional hdmi cable and an adapter like this one to connect your speakers to the extractor.

You can use something like this

Im still debating if i should cause of the price. another question for me to plug my headphone to the mixer i would need a 3.5mm Female to 2RCA Male Stereo Audio Cable https://www.amazon.com/dp/B00B2HP1FY/ref=cm_sw_r_cp_apa_L9u-zbR6KTD28

You can have 4 stereo inputs on that mixer.

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Without the mixer you would need to link the 2nd PC audio by 3.5mm line out stereo jack to the 1st PC line in. Then you need to mix the audio on the fly before outputing to the DAC.

Stereo Mix may or may not be available for you, so you may have to find a 3rd party solution.

With the Mixer you would need

2x https://www.amazon.co.uk/UGREEN-Splitter-Controller-Connector-Gold-plated-Green/dp/B00LM2Y2U4/ref=sr_1_2_sspa?keywords=stereo+rca+to+3.5mm&qid=1565680031&s=gateway&sr=8-2-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUExMkJENUJDUjFIS1lIJmVuY3J5cHRlZElkPUEwNjQyMjAyT0NXWVhBN080ODkzJmVuY3J5cHRlZEFkSWQ9QTAzNzUwMzdBUEowV0M4TjRKNUQmd2lkZ2V0TmFtZT1zcF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl

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1x https://www.amazon.co.uk/UGREEN-connecting-smartphones-tablets-players-Black/dp/B00B2HP1FY/ref=sr_1_5?keywords=stereo+rca+to+3.5mm+female&qid=1565680072&s=gateway&sr=8-5

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Wire both the the RCAs from the PC and DAC outputs into the 1st and 2nd inputs and the the female 3.5mm to the output of the mixer.

Then just set the levels.

If you don't already own this mixer I would go the software router 1st.