Yeah thanks for your reply, it think I’ll add 10 watts to the signal power tab just to give a bit of headroom, but like you say it’s never gonna be run at full wattage. Ill give it another try on winisd and try to get close to your box size etc, and see how it goes. As for the first port resonance, as long as it’s above double the tuning frequency it’s fine right? Or should I try to keep it out of the 2-4khz region as well?