I made these cabinets in 1990. The driver is a E140. I don't remember how I calculated the port area when I made them. The internal dimenstions are 22.5 wide, 23.625 high, 15.5 deep. That equals 4.77cu.ft.

I think I made the ports to big they are very efficient but have a hard time getting low end out of them. I know 40-50 is about the lowest the E140 would go but I have to EQ 63-100 up more than I think I should. Can anyone tell me what the area of the port should be with this cabinet/driver combination and how low I can expect to go.

Thanks, Keith