Best lower end cables for B&W speakers...?

If you want a nice project and have the skills I would recommend https://youtu.be/Uqx6VhWq9E8 This video includes the use of Mogami W3104. I have used many different cables over the years and have been very satisfied with Mogami. BTW Mogami's RCA can be used as coax cables. Mogami cables like Canare  have been used to create and produce legendary recordings . 
Transparent cables 1/2 the time IMO get a bum rap that is not really justified .Transparent Cables will work very well with certain types of electronics and speakers. I can say two things critical with transparent. They must be used with the entire system. If Possible when ordering you should tell your dealer about your system. Today I have 5 different systems and they are 95% Mogami

You tried cables and heard what they can do and so you probably have a pretty good idea that it will be worth it if you can just find the right ones. This can be a whole lot easier than you think. Synergistic Research has been making really good really high value cables for so long now (going on like 40 years) there is a good fairly steady supply in the used market and since the quality over the years has been really steady you can simply find the best you can afford and be just about guaranteed of a good experience.  

The Synergistic house sound is big and bold, smooth and detailed, and they all have very good imaging. Never any harsh hyped top end, never any anemic bass. Just good quality sound you will enjoy. The newer the better. But some of the older ones are depreciated enough they can be great deals. Like my Element CTS were $7500 new in 2005, now only about $1200, very hard to find anything that good around that price. Same goes for the lower end/cheaper wire. Not saying they are the best. Saying this is your high-percentage low risk move to get the kind of sound you will feel was worth the money. 

I have an 8’ run of Canare 4S11 with spade connectors purchased from Blue Jeans to my Vandersteen Treo’s and have been very satisfied with performance and the build quality of the cables. I am also using Wire World interconnects from the Cable Company and am very satisfied with them also. Worth a try and if you don’t like them the return policies are decent.

Hello,
I like the ideas of the speaker cable upgrade. You don't have to break the bank like a lot of people think. I’m going a different route. Try upgrading your power cable even if it’s for a surround sound receiver. Go with 12awg cable if you can but 14awg is ok too. You can start by trying some inexpensive ones on Amazon. This way if they don’t work you can return them. They will need a week or so to settle or burn in. My thinking is your basic 16awg power cable you received with your amp/ preamp or surround sound receiver is not letting your system breathe. If your amp or engine can breathe it will push your speakers more efficiently. If this works and I know it will think about upgrading to a better power cable than the one from Amazon. You can return the Amazon cables or use it on the subs which also get hungry for power. Just so you know I did this and I have all upgraded power cables to Nordost in my system. Many of the companies listed above by other members have power cables. If you live in the Chicagoland area this store lets you try before you buy. https://holmaudio.com/
That way you can really see if it works. In Nordost I would go with Red Dawn power cable. It is 14awg but really, really good.