Reddit mentions of AmazonBasics 1-Male to 2-Male RCA Audio Stereo Subwoofer Cable - 8 Feet

https://www.amazon.com/AmazonBasics-1-Male-2-Male-Audio-Cable/dp/B01D5H8N8K/ref=sxin_3_pb?keywords=subwoofer%2Bcable&pd_rd_i=B01D5H8O9S&pd_rd_r=fac46cfa-31e6-474b-8afb-fd57cf3a20dd&pd_rd_w=Zz7W8&pd_rd_wg=FWps6&pf_rd_p=9ef0c97a-254b-445c-822b-c948e2d94ddd&pf_rd_r=PZZDQE5Z6KPZD8VV4FSS&qid=1562175401&s=electronics&th=1

Here, save yourself some trouble and get it all in 1 cable, https://www.amazon.com/AmazonBasics-1-Male-2-Male-Audio-Cable/dp/B01D5H8N8K/ref=pd_sim_23_28?_encoding=UTF8&refRID=F2Y2YXYJ65YA4Z27C1Q9&th=1

Yupp! On the back of the amp there is a plug that says "SW". That's for the subwoofer. The subwoofer has two options. You can use both the red and the white inputs with a cable like this, or, you can just go into the one labeled "LFE" with this cable here. For the speakers, some of this cable will go into the back of the speakers and the amplifier.

Does that help?

These, length you need to decide

https://www.amazon.de/AmazonBasics-PBH-20214-Cinch-Audiokabel-Cinch-Stecker-auf/dp/B01D5H8N8K/ref=sr_1_15_sspa?keywords=subwooferkabel&qid=1562883570&s=ce-de&sr=1-15-spons&psc=1

https://www.amazon.de/AmazonBasics-Toslink-Optisches-Digital-Audiokabel-3-m-Schwarz/dp/B00L3KO3YU/ref=sr_1_1_sspa?keywords=toslink+kabel&qid=1562883710&s=ce-de&sr=1-1-spons&psc=1

https://www.amazon.de/AmazonBasics-Lautsprecherkabel-mm²-Gauge-100-Transparent/dp/B01D5H8YNO/ref=sr_1_1_sspa?keywords=10+gauge+speaker+wire&qid=1562883776&s=ce-de&sr=1-1-spons&psc=1

This is optional, makes moving them to clean around your desk easier.

https://www.amazon.de/Nakamichi-Bananenstecker-Bananas-vergoldet-schwarz/dp/B00B257Z32/ref=sr_1_6?crid=U9Y500CMGKCI&keywords=banana+plugs&qid=1562883892&s=ce-de&sprefix=banana%2Celectronics%2C169&sr=1-6

I talked with Yamaha chat support and the guy told me I needed to get one of these. https://www.amazon.com/gp/product/B01D5H8N8K/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

That way the purple end will go into the Subwoofer 1 port on the receiver and the other two will plug into both the left and the right RCA connectors on the subwoofer. Just connecting an RCA to the subwoofer 1 port and either the right or left RCA on the sub won't work.

Just for reference.

https://www.amazon.com/dp/B01D5H8N8K/ref=sspa_dk_detail_1?psc=1&pd_rd_i=B01D5H8N8K&pd_rd_w=Xt1tm&pf_rd_p=45a72588-80f7-4414-9851-786f6c16d42b&pd_rd_wg=iJxPF&pf_rd_r=P6MEZVRY1YY5AWJ8RYRG&pd_rd_r=a66ad30f-cde9-490f-af60-16ab29a52619&spLa=ZW5jcnlwdGVkUXVhbGlmaWVyPUEzSFJNVkpZSU8xS1FIJmVuY3J5cHRlZElkPUEwNDI5MDEwOEhWODY3QzgxSDBWJmVuY3J5cHRlZEFkSWQ9QTAyMDYxMzUyRldMT0tRN0YwM1I3JndpZGdldE5hbWU9c3BfZGV0YWlsJmFjdGlvbj1jbGlja1JlZGlyZWN0JmRvTm90TG9nQ2xpY2s9dHJ1ZQ== for the rca to subwoofer.

Easy answer?

Split the RCA signal then going INTO the Valhalla. Something like this:

https://www.amazon.ca/AmazonBasics-1-Male-2-Male-Audio-Cable/dp/B01D5H8N8K/ref=sr_1_7?keywords=rca+splitter+cable+male&qid=1570037120&s=gateway&sr=8-7

One of the split ends to the headphone amp, the other to the subwoofer. BEFORE THE AMP This is important.

This is the easiest, cheapest way I can think of to achieve what you want.

Again, what you're using this mixer for isn't really what it was designed for.

Harder Answer: You really should be pushing your Alto speakers via the main outs, and your headphone/sub out of the monitor outs. The headphone out is... a headphone out, but the answer above will suffice for you until you retire this system.

Ideally, you'd be using a better sound card and no mixer at all. (let your PC be the mixer). You would want something with at least 6 outputs, but the price of these have come down significantly in the last decade or so. When it's time to upgrade, take a look at what's available.

put on of these (3.5 trs stereo to mono RCA) on the back of your dot.

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the plug one of these (male RCA to two Male RCA splitter) into the s/m adapter, and plug the other end into your stereo inputs.

Ok. So no special tips or anything. I haven't hooked any of these up in over a decade.

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So these should work

RCA - Looking at the Denon it shows only one port for the sub. So should I get 1 male to 2 male/

Edit: I see now I need to go single to single.

Speaker

https://www.accessories4less.com/make-a-store/item/yamrxv483bl/yamaha-rx-v483-5.1-ch-x-80-watts-a/v-receiver/1.html

Plus

https://www.amazon.com/Jamo-Studio-803-HCS-BLK-Cinema/dp/B07JJ5VKHL

Run the surrounds or use them for desktop or something else or sell/give away........( they are Free basically since speaker pkg. is $30 Cheaper than S803 plus Center separately )

Plus

https://www.amazon.com/Infinity-SUB-R10-Reference-10/dp/B00K7F63CM

$705 plus tax plus cables n wires plus possible speaker stands.......

https://www.amazon.com/AmazonBasics-Speaker-Cable-Gold-Plated-Banana/dp/B07FKJDTPY

https://www.amazon.com/AmazonBasics-High-Speed-HDMI-Cable-1-Pack/dp/B014I8SSD0

https://www.amazon.com/AmazonBasics-1-Male-2-Male-Audio-Cable/dp/B01D5H8N8K

https://www.amazon.com/Atlantic-77335799-Speaker-Bookshelf-Speakers/dp/B007P8DKDE

https://www.amazon.com/VIVO-Universal-Surround-Speakers-STAND-SP03B/dp/B01MCS2ZLO

Can you send the screenshots of the exact cables/bananas i need? from this 2 items:

https://www.amazon.de/AmazonBasics-PBH-20214-Cinch-Audiokabel-Cinch-Stecker-auf/dp/B01D5H8N8K/ref=sr_1_15_sspa?keywords=subwooferkabel&qid=1562883570&s=ce-de&sr=1-15-spons&psc=1 and https://www.amazon.de/Nakamichi-Bananenstecker-Bananas-vergoldet-schwarz/dp/B00B257Z32/ref=sr_1_6?crid=U9Y500CMGKCI&keywords=banana+plugs&qid=1562883892&s=ce-de&sprefix=banana%2Celectronics%2C169&sr=1-6 ? so i dont buy the wrong ones, please?