How to effectively plug up a port, and/or is it even a good idea in my case?

[Aleks15Civic]

I will be running two of these in separate 4.75cu ft enclosures:

Massive Audio Hippo-152 15" Hippo Series Car Subwoofer

I am planning on using two of these as ports per box:

Precision Port 4" Flared Speaker Cabinet Port Tube Kit

Using the following calculator to determine lengths:

Products Menu

Here I tune to 34hz with two ports and get the length of 10.4" per port

View attachment 26552191

Here I tune to 24hz with one port and get the length of 10.4" per port

View attachment 26552190

At a previous competition, I saw a guy use some massive rubber plug to plug a port and drop the frequency on the go. I was wondering if I can do the same thing here, and if so, where do I buy/how do I make such a plug?

34/24hz both sound like pleasing frequencies to me. But I don't want to dive in without hearing your guy's feedback first.

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[CSCStang]

CHERNE INDUSTRIES Pipe Plug,Mechanical,Size 4 In - Pipe and Test Plugs - 1VNF7|270245 - Grainger Industrial Supply

You can get these. I've seen them used before. As far as using 10.4" aeros I would say that for the 24hz you will be way under on port per cube. General rule is 9-12 per. At 34 you would also be under just not as severely.

 

[Aleks15Civic]

Thanks for the link, that look exactly like what I saw the guy use.

I can't make the ports any longer than 1ft long, so I don't really know how to get more area. I add a larger port on the calculator and the length goes way up. Unless I'm misunderstanding the whole porting concept.