I have Overture 3s. I have used them with various levels of tube equipment and have heard no fault like you are at a loss of words over. They stopped making them because I don't think they were making money on them...brand name dilution because of lower level products etc. The overtures were their last expensive speakers before they got out of highend...then to come back with their new line.. to reassert the brand name on highend. Your first line makes me think you are looking for someone to agree they are mid-fi and good for that line of equipment. Someone will agree here...but Infinity's track record with speaker design is undeniable. I find their sweet spot is not as large as I would like...but when you are in it everything is right on. I have had vocals right up front-center and sometimes not...source material sensitive like any other speaker. Just my impressions over the last 5 years with them...and I would not have kept them if I didn't like them. Synergy is everything and maybe your system somehow doesn't have it. 2 cents.