Like dimensions, how I should port it, size of the box/ port, should the port be rectangle or circle, the length and width, should I put braces supports in the box , the length and width of my box ,the box design. Ideas I could use I already have a 3 15 box I could use I just was thinking about cutting the 3rd 1 off and then make a port and put the 2 hds alone in it and make a different 1 for the orion I have MDF wood just want some ideas I wanna be around 40 hz also I will put the hds which are dual 2 ohm subs on a audiopipe 3k the long monster at 2 ohms or put then on my skar rp2000 idk yet use them both for diff setups but thats why I said putting orion with them might help because it will bring them down to 1ohm because the Orion is a dual 4 ohmnsub and hds dual 2 ohm so I can wire both hds up then to each other which will put then at 2 ohm then wire orion down to 2 ohm the to hds to make 1 ohm so I can pull more power outta amp but the audiopipe is 3k at 2 ohms so I'm not sure which 1 I'd go with for this setup so just throw some ideas out at me I'll send a photo off my box so you have more of an idea of the 3 15 box I'm working with but thank you for helping I can either cut the 3rd hole off and make a port for a 2 15 ported box for hds or put I wall between hds and orion in same box