That appears to be regular old 2-wire, with a fancy shmancy connector. If you only need to extend it in the middle and already have the connectors at each end, you can use regular old speaker wire. The linked picture looks to be about 18 gauge, but you could upgrade your extension to 16 gauge and more cable for an extra 5 bucks.
The Fluance RT82 for $300 is a good value. For the price of the RT85 you can get the better new improved Pro-ject Debut Carbon EVO.
For the best value what is a nearby town or zip to search for used options?
Pass on the digitally controlled amp powered Fluance speakers if you want an all analog setup for analog vinyl.
Analog stereo receiver: Sony STR-DH190 $149 with Bluetooth and a built in phono stage preamp with adjustable gain.
Or if there is also a TV in the room, an AV receiver: Denon AVR-S650H-R $399 $329 with a built in phono stage preamp.
Speakers deals:
Floor standing towers and you don't need to buy or build speaker stands:
Or 5x speakers for the AV receiver:
Or 3x speakers for the AV receiver: Best to get the matching center speaker while it is available. Add most any brand side surrounds later, they don't need to match the front speakers brand or model line.
Plus OFC Speaker Wire or cheaper Basic CCA then How to Install Speaker Wire and How To Strip Speaker Wire.
Subwoofer to add now or later:
Yeah it's crazy the little details we think are super important when getting into a hobby that seem to be pretty unimportant later on. I had a Lamy Safari as my first pen, but going into it I thought that the snap cap would be a huge issue. I thought it would be super loud or annoying to put on and off or something like that. Turns out it's not even a problem now that I've got the pen lol.
That pentel looks awesome! I really like the simple and classy look of it. That's a big reason I like the Lamy 2000. It looks like a black pen at first, but is much cooler once you really look at it.
Honestly with speakers, cheap stuff is a lot more fun that expensive stuff to me. I've got a pair of Quad Z-3 towers. Yeah, of course they sound good. If they cost that much and don't, there's a big problem. The thing I like about cheaper speakers is how they all have a very fun character. Once you're spending a lot of money, every speaker out there just tries to sound exactly the same. Cheaper speakers do different stuff though. There are some speakers that focus on midrange, so vocals sound really sweet and warm. There are some that focus on the top end, so you get every little detail up top. There are some that focus on dynamics, so you get that "front row of a concert" sorta feel. I like experimenting with all that stuff. It's just fun. And you don't have to spend a ton of money and get those KEFs to really get into it.
Just for fun, I'll build a cheap setup for you, so you'll know what to get in the future if you ever feel inclined haha.
The Micca MB42X are really the "go-to" starter speaker. They're one of the cheapest that sound decent. And, honestly, they sound really good.
SMSL SA50 to power them. That's on sale for the same price as the SA36 right now. They're the same thing, just this has more power. You don't need it, but you might as well have it haha.
Some speaker cable. You need to cut it and strip it to put it into the speakers. There are quite a few tutorials out there on it. It's pretty easy.
Boom, just like that you've got a sweet stereo speaker setup that will blow any single speaker out of the water, and easily impress anyone! It comes to around $150 with everything.
I'm not trying to talk you into anything, but I'm basically pointing out that you don't have to spend thousands of dollars to get a respectable system.
While we're on this, another thing I like about hobbies is that anyone can be in it at any price range, and that's super cool to me. If someone only has money for a $15 Pilot fountain pen, who cares? That's awesome that they like fountain pens! They don't need to have a $200 fountain pen to be cool. Just anything is sweet. Same with speakers. You don't need a multi thousand dollar system to be "into audio" or whatever you'd call it. If you've got a setup that you like, at whatever price, that's sweet! I'm glad we both enjoy music.
So between your turntable and speakers, you are going to need something to amplify the sound. This can be as something as simple as this, or you can get an upgraded receiver for a few hundred dollars, or something like this. You need to get something to amplify the current and basically convert the RCA (red/white) cables from the turntable into speaker wire with a stronger signal. Between the receiver and speakers, as I mentioned, you need speaker wire, something as simple as this will do. For pretty much any component in a speaker system (including even the wire) you can go deep down rabbit holes if you take an Audiophile approach. But, if you just want to listen to some records, receiver + speaker wire will be your only investment.
Any generic speaker cable will do, unless you are using huge lengths. You can add banana plugs if you want, but they don't do anything for the connection quality.
https://www.amazon.com/AmazonBasics-altavoces-calibre-Alambre-Transparente/dp/B006LW0WDQ
Are you within the return period on those speakers? Objectively they have some major issues.
If you enjoy them that is fine, but something like the Pioneer BS-22, Micca RB42, or Sony SSCS5 would be better value. Especially the Sony, because they are on sale right now.
https://www.bhphotovideo.com/c/product/1116657-REG/sony_ss_cs5_3_way_3_driver_bookshelf.html
The manual Crosley C6 BT $99 adds adjustable tracking force and a removable cartridge over the basic automatic LP60X. Or Crosly C6 $123 in red.
What is a nearby town or zip to search for used speaker options?
Consider starting with a good stereo setup and adding the turntable later:
If you must get the turntable now, lowest budget decent new speakers and digital mini amp: 6-1/2" 2-Way Bookshelf Speaker Pair and Hi-Fi Mini Amplifier Bundle $65. Then later upgrade one part at a time.
Or a bit better digital mini amp and speakers:
Or for a small room 4" Edifier digital amp powered starter speakers however you can't later upgrade one part at a time. New S adds subwoofer out jack:
Guides: