What speaker cable for Martin Logan motion series (AMT) tweeter.

@bobrock +1 to what @soix said and what about the Mogami speaker cables do you not like now? What are you looking for more or less of out of the sound?

btw, for reference I also run ML Motion Series in my Home Theater and use silver-over-copper cables there (only) for improved dialogue, detail. However, my main two channel system is running custom speakers with large AMTs, and there I’m using all Cardas Grade1 copper paired with two different Class-A amp setups. Each cable setup helps to achieve different results for different reasons and use.  

Just wondering what your current thoughts are about your Mogamis (not bad cables), ... a bit more info about what you’d like to change is helpful.

I think Mogami are light on bass and not the best in mid-range. Also, not the most quiet cable. I had the chance to audition Kimber 12 KTC, Analysis plus oval 9, and Shunyata gamma . Now I am really torn. All have their attributes. A friend recommended Purist audio design but I know noting about them. The Shunyata seems to be the most resolving so far,

@bobrock it seems like you’ve already got a good handle on trying different cables and helpful examples so far getting started. I got baited by a good friend 30+ years ago who had a massive supply, and later again with a few dealer friends who let me try different cables. All invaluable experiences yielding results I never expected.

Since you mentioned Mogami and what you hear, and above you mentioned AP Oval 9s, and Cardas being "too smooth"... What I can share is the AP cables and Cardas can sound noticeably different up & down the lineups with different designs of cables they offer. If you feel the Mogami are a bit lean on bass and midrange [in your system], some might say "neutral". By chance do you have access to a local dealer who will let you try different cables? Or, have you ever checked out the "lending library" service at TheCableCo?

Cardas are designed to be very warm at the bottom tiers (concealing flaws) and more open and neutral as you move up their lineup. So, top level will be much more transparent. I use Transparent exclusively… they are just that… you get exactly what your components are passing on without tonal adjustment. I have all Audio Research Reference stuff so that is perfect for me. No tonal adjustment between tiers just improved performance. Good choice if your system is up for it. AMTs are great but revealing. I would try Cardas Clear xxx and a Transparent that fits your budget. Then choose.

Given you haven’t found the right cable yet I’ll reiterate my earlier recommendation for the used AZ Satori shotgun cables for $850 that still seem to be available.  If they don’t work out you can very likely sell them for no loss so very little risk, and I think there’s a good chance they’ll do everything you’re looking for.