Any cables that give more bass

Casouza - I agree, some musicians use lowest notes frequently but speaker limited to 40Hz will still play them, only softer (compromise). There are closed speakers with fairly good bass performance and definition.

My non-audiophile friends believe that extension is the most important quality of the speaker. I explain that I get extension from my room amplifying 30Hz and the speaker's port tuned to 30Hz is a not good thing giving me unnecessary energy at 30Hz and +6dB hump lasting thru multiple frequencies 60Hz and 90Hz. Since one of the bass speakers covers the midrange (2.5 way) it makes midrange a little muddy. I also suspect that port affects proper summing of harmonics (group delays) and the tone of instruments. Not only Tone but also other qualities of acoustic bass - Presence, Projection, Sustain, Separation - much more complex than just extension.

I don't have anything against good bass extension but not at any cost. It make me think when I see review of ten times more expensive speaker than mine of the same physical size that has worst extension. I would probably settle in future for less extension and better coherence and imaging.

As for music taste - I listen to pretty much the same: Jazz, Classical (including Indian), World and also some modern/contemporary. I don't have anything against popular music as well.

Not pertinent to the OP's issue, but in electronic music the computerized synths are sometimes played with tones going down below 20Hz. You can't hear it, but with the right sub you can sure feel it!

And, IMHO, it would be a sin to play Nine Inch Nails w/o a sub that goes down to at least 25Hz.

You will increase bass performance dramatically if you can find some solid copper about 6kv mm or thicker, not thinner. After a short burn-in the copper will open up for your amp and with that low resistance it will show what it`s made of.