Cables for high efficiency speakers?

Good points on the silver wire Stanwal. My previous speakers were Linkwitz Orions that I built myself, I originally used copper wire to wire them. After about 8 months of listening I rewired them with silver wire, and the mids and highs really opened up with the silver wire, quite a noticeable difference, I was surprised what a difference the silver wire made on those speakers.

I would seriously give the Clear Day double shotgun wires a demo.

I'd also recommend Clear Days. I preferred the single runs with my high efficiency speakers. YMMMV though, so try as much as you can.

Thank you guys, I will add Clear Days as a contender.

I use Lowther PM6A Ticonal in Carfrae horns.
The CAT6 was etched but direct & energetic.
The Tara RSC Master Gen 2 was veiled but fleshy with ex. flow.
The Cardas SE9 was soft but delightful with silky detail.
The 0.35mm solid silver was very detailed but no harmonics, no weight, no soundstage.
The VDH "Inspiration" is UNBELIEVABLE!
I've solder them (3.5m) directly to the drivers & match them with VDH "Orchid" IC with great success (although I like to audition the new "Mountain" in searching for even more transparency & inner detail).
This was quite unexpected as I've always choose Cardas instead of VDH.
If it's possible give them a try! -they are not pricey.