J.A - Thanks for asking. Good progress re comparative listening and measuring tools. Great appreciation for Jim's component choices within his budgets. I'm presently testing various mechanical upgrades: cabinet stiffening, stiffer driver mountings, XO panel isolation, etc. Advantages of hindsight include location of cabinet resonances via reviewers and more sophisticated instrumentation. I can address some of them, others are baked in. Many electronic components are chosen, but no crossovers yet. pm to you.