Wayne ... thx for Pro 4 plans. If I use as separate woofer boxes I need to compensate for horns. Can I have the exact net volume you use? That way I can add my bracing to get internal volume dead on. I tend to get a little crazy on strength. I don't think the box Q change will effect porting, but not sure. Should I use an adjustable port? Speaker displacement also, if you have? Zene