1). is the equation for using precision port (flared) correct? how do you manipulate this equation if you are using 2 ports? Chris Tsutsui, maybe you can help me here because they are what you used iirc. im using a pair of 4" flared kits, and dont know how long to make them. the equation is: 8466.4 R^2 ---------- - 1.463 R = Lv (Vb) Fb^2 Lv = port length in inches Vb = volume of box in ft^3 Fb = tuning frequency R = radius of port 2). i have a 1-input (1 red and 1 black) binding post, but the tempest has dual voice coils. how do i connect them? im thinking that after i attach + to + and - to - (for parallel connection, right?), i could strip the wires so i can tape or sauder (sp?) them to another wire that would be going to the binding up. will this work? im feeling pretty good about this project. i have everything i need!...except for the sonotube : ( i'll get one after i get some money. the only reseller in town wont sell me anything smaller than a 12' section. p.s. 3). a quicky: a 24" sonotube refers to the outer or inner diameter?