I can't help much with the Larsson speakers but I did have a pair of Sonab speakers from which these descended. I think mine were oa12s but it was a while ago. Overall I liked them a lot but at the time I was flipping gear like crazy. I believe the history goes that Stig Carlsson first had Sonab, then Carlsson and one of his co-workers went on to found Larsson. There is lots of history online about the theories behind Stig Carlsson designs. I think the Larsson designs are a progression on the stuff they were working on before.