Even though I haven't tried the Sonicap Platinums in Salk Speakers, I've added them to 3 different speakers (AV123's Strata Mini's and X-Omni's as well as GR Research O-3's). A couple of things come to mind about potentially adding them to the Salks. First, it's important to remember that the Platinums are not cheap. So, depending on the number of caps you need to bypass, it can get expensive (e.g. 6 w/ my Mini's). Second, I do not know what type of caps are being bypassed in the case of the Salks (though I am kind of curious about that). In all of the above speakers, the Platinums were added to Sonicap Gen I's. So, the Platinums may synergize better w/ the Gen I's than w/ other caps. Third, Danny Richie's recommendation is to use Sonicap Gen II's as bypass caps for caps in the woofer circuit. Yes, the Platinums are better than the Gen II's (significantly in my experience in the tweeter circuit), but it's not typically worth the additional cost. Fourth, while I've noticed clear sonic differences in all cases, the amount of improvement depends on the speaker. With the X-Omni's and O-3's, there was a nice increase in detail and musicality, though not dramatic. A nice improvement and worth the money spent, IMO. But with the Mini's, there was a much more noticeable and dramatic improvement even without them having burnt in (which takes between 150 and 200 hours in my experience). Same types of improvement w/ detail and musicality, it was just more of a jump in the case of the Mini's.
Hope this helps.