Advice on choosing speaker cables for vintage Altec Model 19 speakers

Thanks everybody for the advice. In my past life I was a recording engineer working in the analog world with 48 track Studer 2 inch tape, Neve modules and Class A outboard gear. I worked in a solid state environment  with Tannoy large speakers and and the ubiquitous Yamaha NS-10 near fields. As a result I went from electro-magnetics to a Mark Levinson/ B&W 801 combo to compare mixtapes from my daily sessions on an apples to apples scenario. This was fine for the last 25 years. I eventually sold the B&Ws for som Wilson Sophia and added a Spectral solid state system. Foolishly  sold my record collection because I had the majority of my collection burned into an Innuos digital music server. Now I'm converting one of my seven wine bar/cocktail bar restaurants into a listening room. A coming full-circle if you will . A horrible time financially to be purchasing vinyl again. With the Spectral system I'm using MIT cables per the designer's suggestion. Obviously I can hear the difference but my question is more of a practical one seeing I'm using the Altecs and Klipsch in a commercial setting and longer runs from the tube amps are essential.

We have a pair of Altec VOT A7-8 which are an older model of the 19s. Rented several brands of speaker cables from the Cable Company and have found the Shunyata Research Gamma Speaker Cables the best. Tried silver threaded cables and found they don’t match well with the horns. The Gammas are pure high grade copper and give a full, rich, and slightly warm sound. We listen to all genres of music, mostly smooth jazz. good luck with your choice.

I should add that in the US "listening rooms" aren't the same as in Japan where critical listening goes on. This will be more of a restaurant atmosphere where converation and cocktails dominate. That said I want the music to sound good and not just be a visual thing.

Well, you haven’t mentioned the length of cables you will need. Some good quality shielded 10 to 12 gauge would do fine. Solid core, not stranded if the installation allows. Don’t over think this. Figure out the length, calculate the resistance and choose the wire. I really doubt your customers have the ear that you do. And certainly not in the environment that you intend on presenting! 

Audioquest in Irvine has bulk spools of in wall rated wire . Let us know when this place opens. I’m going to do a Jazz Kissa pop up in Seattle this Summer… there will be wine and Japanese whiskey