Help with Aero port for 2 10 inch sub

[Bajan 246 0]

I have two 10 inch subwoofer in a very big box. 4.4 cubic feet before displacement. I have one 4 inch Aero I made with pvc pipe but I get noise at low notes,tuning right now is 30hz. Was thinking to go with 6 inch tuned to 33hz.

[///M5 2,833]

First thing I'd do is make your box smaller.  Fill it with something.  

 

At the same time, describe the noise you are hearing please.

[Bajan 246 0]

The noise sounds like alot of air is trying to get through the port but can't properly, that's the best way I can describe it, only occurs at high volume and on really low notes. I plan on putting maybe 4 8 inch in the box or 2 12 and I don't have the time to make another one right now.

[///M5 2,833]

First step is to fix the overall size of the box and then re-listen.  Bit of a catch 22 though as you won't know what you need for port length until your volume is right since they are related.

 

No matter a 4" is too small so you need to go bigger.  Pretty easy to model and find out how big

[Bajan 246 0]

Thanks so much for your help. Will change port and maybe put some bigger subs or another 10 in the box

[nigel 148]

Should probably fix what you have to maximize potential, before trying to add more.

Just sayin'

[Bajan 246 0]

I'll probably go with 2 12 for the amount of airspace I have

[Notorious97200 339]

You may be able to run 2 12" subs in this box. But a single 4" port won't be enough.

 

Put some big pieces of wood inside the box first, and listen with your current subs. you could like it.

[///M5 2,833]

Yes, remember.  The box is more important than the drivers so start by optimizing that.  Of course optimization of a box requires knowing what drivers you will use.

[Bajan 246 0]

Thanks everyone for all your help and input. Will try and optimize box and use the drivers I have. My head unit is giving some trouble so I'm gonna get it exchanged first