Porting Whoas...

[Heathd 0]

All my experience in audio comes with sealed enclosures, even so, after having visited this site, I feel like my past work was rather half assed and mindless. This is what I have so far:

I am planning on using two soundsplinter rli10s, and I could be perfectly content with keep it sealed, but I want to try my hand at porting and perhaps learn something new. I have been trying to talk to a few people about porting this enclosure, but I am not really getting any good information, and I am also reluctant to trust any information from WinISD. From what I understand, that program can be slightly flawed.

My box is 1.08 cubic feet after all displacements are taken into account, except for the ports of course. Im looking to tune the port to 32 Hz, and would also like to know where the ports should be placed. I am assuming that since my subs are up firing, so should the port, but since I dont know much about porting, I am probley wrong.

Any advice and information is greatly appreciated.

Thank you,

Heath

[///M5 2,833]

You can't fit a port and two Rli10's in a 1.08cuft box. You will need a bigger box.

[Heathd 0]

You can't fit a port and two Rli10's in a 1.08cuft box. You will need a bigger box.

Ok, I must have the specs wrong on his website.

Sealed it is.

[KU40 173]

There's nothing wrong with winISD's port calculator and several of the graphs they depict. The only "flaw" in it is the SPL graphs, which are based on an anechoic chamber, I believe. So when you put it into a vehicle that is thrown out the window. But the transfer function magnitude, group delay, impedence, excursion, and port velocity graphs should all be accurate because they are based on the sub/box relationship and have nothing to do with the environment they are placed in. Those are really the only ones that you need anyways.

[helotaxi 46]

The Transfer function magnitude can give you a good frame of reference but it isn't going tobe an accurate depiction of the response that you will get in-car becaue it doesn't include cabin gain. WinISD is a very useful tool, but just like any tool you have to know what it can and can't do.

The spec boxes for the RL-is are really small which means that you will need a huge port to get the desired low tuning out of them. The port is going to end up being bigger than the box when it's all said and done. Gross volume with the port will end up being around 3 cf.

[Tirefryr 1,742]

External vent(s).

[KU40 173]

The Transfer function magnitude can give you a good frame of reference but it isn't going tobe an accurate depiction of the response that you will get in-car becaue it doesn't include cabin gain. WinISD is a very useful tool, but just like any tool you have to know what it can and can't do.

Yeah. I meant to convey that in my post.

[helotaxi 46]

External vent(s).

A single 6" port would be just over 5ft long and a pair of 4" would be just under 5ft. That sounds practical...ok probably not.

[Tirefryr 1,742]

And did he ask about practicality? No, he asked about making a vent(s) for his enclosure.