I'm new to building speakers and alot of what I read seems Greek to me. I have 20 years experience with woodworking. I'd like to get a reccomended volume size in lay terms (ie... I need X amount of internal volume in cubic feet or inches ) for 2 different boxes I want to build. The first box will be for midbass and will house 2 altec 421-8lf drivers, the second box will be for low end bass I'd like it to go down into the mid 20 hz range and the driver will be the 18" eminence bass driver or jbl equilivant (depends on what I can find ) I don't have all the specs of the drivers (this is the Greek part for me) I would appreciate any help. I also don't have access to a computer most of the time I rely on my iPhone so web site reccomendations are welcome but not always practicle. Thanks in advance. Joe