Regarding the SR cable risers at 4 for $400, I hope you have two foot cables to each speaker or your gonna need at least a couple of packs of them.Yep, another ripoff aimed at the gullible, if you REALLY!!! believe it makes a difference, you can get 100 of them for $20!!!! At least this rubbish is in the correct forum.
https://www.ebay.com.au/itm/353393544686?chn=ps&norover=1&mkevt=1&mkrid=705-139619-5960-...
Or take your pick
https://www.ebay.com.au/sch/i.html?_from=R40&_trksid=p2334524.m570.l1313&_nkw=Plastic+Pizza+...+
Cheers George