Looking to replace Acoustic Zen Matrix Reference

Not a cable expert but if you're looking for more extension on top and on bottom I don't think you will find much difference at your price point. In my system which has useable response below 20Hz and has a ribbon tweeter, I don't find the AZ ICs a limiting factor in that way. They may be a little on the warm side of neutral if you want to change the tonal balance. To tip the balance up go to the AZ Silver Ref IIs. You might try moving the speakers around and toe in aiming them more towards you. That will have a much greater impact than cables at the frequency extremes and is well within your budget!

Thanks Barry, you have a great setup...

Silver/teflon, e.g., AZ Silver Ref II or DH Labs Silver Revelation.

I'm glad that your speakers are getting into the groove. If you're looking for more extension on both sides, even though at twice the budget, I think you'd have a hard time trying to find something better than Clarity Audio cables. Will help with the focus which omnidirectionals need typically. There's some for sale right now.

I used to own AZ cabling and eventually went with all Nordost. Nordost really worked well in my system. The Norse 1 Frey's or Heimdalls are in your price range used. I personally own the Frey's in my system and love them.