Port size for shiva application--please help

JoelTW

Stunt Coordinator
Joined
Apr 1, 2003
Messages
110
I cut out the bottom end cap for my sonosub (18.5"). It looks like I probably won't have room for the 4" flared port since it looks to be 5" diamater in pictures, and the shiva takes up most of the bottom end cap as it is.

Is it better for the port to be on the same side as the driver?

Should I get a 3" flared port instead?

What length would the port need to be if my volume is about 142 liters?

Thanks in advance!!
 

Travis Cain

Stunt Coordinator
Joined
Jan 25, 2003
Messages
79
I think it would be optimal to place the port on the top endcap. If you are concerned about things falling into it, you might consider putting a grill over it.

We'll need to know what tuning frequency you want to give you a port length..
 

David Lorenzo

Stunt Coordinator
Joined
Dec 12, 2002
Messages
198
I agree. Just put the port on top. There won't be any disadvantages sound wise. As far as port length, try downloading Win ISD Pro and play around with it a bit. It's very easy to use.
 

JoelTW

Stunt Coordinator
Joined
Apr 1, 2003
Messages
110
What about dust collection?


Also, with a 3" port Win ISD says 62 m/s air velocity and 32~ with 4".

Can I just use a 4" pvc pipe on the bottom instead of the flared kit?

 

JoelTW

Stunt Coordinator
Joined
Apr 1, 2003
Messages
110
I have another question... this may sound dumb

If I plan to use just an LFE connection, I really don't need a Dual Voice Coil driver, do I? Just a waste of money?

:b
 

TimForman

Supporting Actor
Joined
Dec 4, 2002
Messages
847
The DVC is going to allow you to choose the impedence you want (4 or 8 ohms) and allow you to feed it a bunch of power (650W). It's easy enough to put a stand-off type plate above and below the tube. There are many examples of other HTF members doing this on their Sonosubs. Mine sits horizontally so I don't worry about stuff falling into it. Plus, nobody in my house tries to shoot baskets into my sub. Shiva Column
Oh yeah, your 3" port will need to be about 6 1/2 inches long.
 

JoelTW

Stunt Coordinator
Joined
Apr 1, 2003
Messages
110
Thanks again for all the help


I'll try the pvc first since I don't plan to play it loudly


i found winISD online port calculator... pretty nice
 

Frank Mowry

Stunt Coordinator
Joined
Mar 25, 2003
Messages
57
In Adires vented box instructions it says if you're using straight pipe, to add 5" to the port length. Page 7 mid page.

Frank
 

David Lorenzo

Stunt Coordinator
Joined
Dec 12, 2002
Messages
198
You don't add 5 inches to the port length. You add it to the center tube length. The total port length would come out to be 1 inch less than a flared port.
 

JoelTW

Stunt Coordinator
Joined
Apr 1, 2003
Messages
110
hmm.. Now you guys have me confused.

I just ordered the 4" precision port from PE should receive it this week
 

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