What speaker cable made a major difference in the sound quality of your speakers??


I am curious what speaker cables made a big "jaw dropping difference" in the sound quality of your current speakers.  What most impressed you about the difference;  that is, overall musicality, tighter, deeper bass, midrange clarity and soundstage depth, etc.etc. 

Keep the price of the speaker cables chosen or auditioned at  between $800- $1000 or  from  $1000-$1500. Was the cable bought new or used??

  Thank you,   SJ

sunnyjim
Neotech UP-OCC copper in Teflon. Parts Connexion. About $12 a foot. Many high end cables use this stuff and then add high markups. The wire is transparent, fast, airy and sweet without being warm.

New Duelund stranded 16 gauge bulk wire at $10 meter from Parts Connextion. No terminations...just the bare tinned wire. Bested all cables costing up to $2000 per 8 foot set. The real deal. 
(1) The effect of cables -- as an improvement or conversely as a detriment-- to the audio performance in your rig is entirely system dependent .... full stop. There is no one-size-fits-all option.

(2) the effect(s) of cables as a potential improvement is an alchemy of ALL your cables together , Including the ICs and power cords. To parse out speaker cables by themselves as the potential definitive "silver bullet" is an incomplete or failed step.

(3) Without prejudice to the points above, and ignoring the simple fact that "jaw dropping improvement" is a highly biased anecdotal and personal value judgement at best ,; At either a $500 or capped $1,000 pricepoint, there are no "jaw dropping" improvements in available speaker cables, in the common sense general application of the term. I have never seen any product in this price strata that even approached a scintilla of that type of description. ... Improvement ..."yes". ....but "jaw-dropping".... never.

I have auditioned significant audio improvement by performing contenders , that are not subtle in the first part and certainly separate themselves from the pretenders (as a full ARRAY of IC, speaker, and power ) , but these were integral in crafting a system synergy in high-end audio systems with cable price-points to match in lock-step. Even these "high -end" cables would fail any long step approximation of "jaw-dropping" in the common sense term.

That term in terms of application to audio speaker cables is an audio unicorn proxy.
Nordost. Price varies depending on length and model. More clarity in a variety of ways.
Sterling Audioquest used$400 at eBay it has the 3D, excellent tonal balance, smooth, palpable, huge soundstage, they are hard to find....it's 4ft...