Reddit mentions of Musou RCA Analog to Digital Optical Toslink Coaxial Audio Converter Adapter with Optical Cable

That's not the equipment you need for what you're trying to do. Your soundbar has an amplifier already built-in, what you need is something to take the analog signal from the turntable and digitize it to a form the soundbar can understand. The optical input (also caused toslink), would be the easiest route. Something like this would do the job.

Ahh - my mistake. You need an ADC.

https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW

And to make the RCA you would use this:

https://www.amazon.com/3-5mm-Mini-Stereo-Audio-Cable/dp/B0032JAG4G

To connect your line out to the ADC. Though, those cables are a dime a dozen at garage sales, I have about 20 of them kicking around because Im old XD

I think that a conversor like this can work. https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW/

they make RCA cables up to 100' ... that being said, i generally recommend keeping your length under 25' for RCAs.

you can get a module to convert your analog RCA out to TOSlink digital

https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW/

and then a long TOSlink cable

https://www.amazon.com/CableCreation-Digital-Optical-TosLink-Theater/dp/B015SQDW3M/

It appears your tv has analog audio out, which will work with the beam. I have a Pioneer Elite Plasma TV that doesn't support HDMI and optical at the same time, but it does have analog audio out just like your TV.

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TV analog audio out to converter, converter to optical/hdmi adapter to beam.

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I use this adapter and it works great. The TV won't auto switch when the TV turns on, but it works just great for my needs right now until our TV dies.

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https://www.amazon.com/gp/product/B01HGHNCMW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Can I use an ADC along with a Fiio A3 amp to use a mic and hear on a PS4?

That is a possibility but I like my current speakers and would like to not have a set of speakers for my TV and a set for my turntable. I searched Amazon and found an analog to digital converter, would that work?

https://www.amazon.com/dp/B01HGHNCMW/ref=cm_sw_r_cp_api_i_1t9SCbT1JFZNF

Analog to optical if your soundbar does not have an analog connection.

https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW/ref=mp_s_a_1_3?keywords=analog+to+digital+converter&qid=1573841418&sprefix=analog+to&sr=8-3

There are analog to TOSLINK converters. For example:
https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW

And there are remote-control TOSLINK switches like:
https://www.amazon.com/dp/B00KDZEWWO/ref=sspa_dk_detail_3?pd_rd_i=B01A89OEUY

So, you could use a couple of those converters, and the remote-control switch.

??????? your TV has RCA out and not Optical? Just use one of these - plug rcas into tv and other end (3.5mm) into the AD18.........

https://www.amazon.com/dp/B01D5H8KO2/ref=twister_B01MDKJXCH?_encoding=UTF8&psc=1

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port A or C in 3 rd pic........

https://www.amazon.com/SMSL-AD18-Amplifier-Bluetooth-Subwoofer/dp/B071JN7GXN/ref=sr_1_2?keywords=AD18&qid=1563872380&s=gateway&sr=8-2

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or use this thing - Tv via rca in, optical out to amp............

https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW/ref=sr_1_1_sspa?keywords=analog+to+optical&qid=1563873557&s=gateway&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEyRzdDUlZBUUE4ODBWJmVuY3J5cHRlZElkPUEwNDE2NjA3MTE4MzkyVVBUN0VKOSZlbmNyeXB0ZWRBZElkPUEwNzMyNjIzMjZZM1ZBRFVRU0FRRiZ3aWRnZXROYW1lPXNwX2F0ZiZhY3Rpb249Y2xpY2tSZWRpcmVjdCZkb05vdExvZ0NsaWNrPXRydWU=

https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW/ref=mp_s_a_1_1_sspa?keywords=analog+to+digital+converter&qid=1564434913&s=gateway&sr=8-1-spons&psc=1&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzMlAyVE5MTjU0M1FXJmVuY3J5cHRlZElkPUEwMTc1MTY1MjBGUEdNNzFPNUpTSiZlbmNyeXB0ZWRBZElkPUEwNzMyNjIzMjZZM1ZBRFVRU0FRRiZ3aWRnZXROYW1lPXNwX3Bob25lX3NlYXJjaF9hdGYmYWN0aW9uPWNsaWNrUmVkaXJlY3QmZG9Ob3RMb2dDbGljaz10cnVl
I think this is what I would need right? I have this same one but it’s a DAC.

The optical in the Modi 3 is an input; same as the optical on your Beam. The only output from the Modi 3 is RCA.

Something like this might help:

https://www.amazon.com/Musou-Digital-Optical-Toslink-Converter/dp/B01HGHNCMW/

Disclaimer: I only just quickly searched Amazon for "rca in optical out", and have no personal experience with the product. But, in theory, it should work.

I second the SMSL recommendation; I have two, and for your needs I'd recommend the SMSL Q5 and love it. Retails for $140 but I got it from those same guys on ebay and it's worked great.

Edit: Didn't realize it doesn't have any RCA inputs, only digital. you could technically get a cheap RCA to optical converter like this but then you'd also want an input switch and that'll just compound costs

Second edit : This is my main guy, I love it but it only has one RCA input so you'd still have to get a switch if you wanted multiple inputs, but that's pretty cheap.