The people advising you to use the tap that sounds best to you are correct(Don't waste your time with 16 ohms). And there's np danger with any tap as advised. As to power with your amps there will be way more than enough power with both the 4 and 8 ohm taps.
4 8 or 16 ohms.
Hi group I just purchased the Audio Research REF 750s mono amps. On the back for the speaker terminals are 3 sets of binding posts. 4 8 and 16 ohms. I will be using B&W Matrix 800 speakers. I believe they are 8 ohms but not 💯 sure. I looked in the manual but can’t find anything about ohms. Someone said to me it does not matter what ohms I connect my speakers to. He said just use the ones (ohms) that sound best. Does that seem right to do ? I don’t want to damage my speakers or amps.  BTW if it matters I will be using an Audio Research REF 6SE pre amp.Â