Help with Tuning! Getting different numbers from different calculators

[QUASIMOTO]

Hello-

I am getting lots of different tuning frequencies from different calculators online.  The problem is I don't own a computer, just my chromebook, so I am limited to web-based programs.

 

My enclosure specs are: 32.5 x 14 x 29 (WxHxD) MDF .75 (double speaker baffle) I would like my subs and port to fire back together.

Subs: (2) skar vvx.3-----(.34 displacement)

I would like to tune my box between 28-33hz (open to suggestions)

 

Here are some of the numbers I have been getting with a 6 inch slot port. 

                  LENGTH:

12 volt: 24-37 inches (28-33hz)

ReAudio: 40-22 inches (29-33hz)

car stereo: 34-21 inches (28-33hz)

 

any help would be greatly appreciated.  Thanks in advance.

 

Quasi

[ckeeler11]

Slot port is 6" by what?

[QUASIMOTO]

sorry 12.5 height

[QUASIMOTO]

I hope  I am using the terminology right with "slot" port.... My real question I guess is; how long should my port be? (the blue board)

 

[Triticum Agricolam]

Unfortunately port tuning calculations are not an exact science.  As long as you get within 1 or 2 Hz, that's about as much as you can hope for.  

I can help you figure out what your port dimensions should be.  Are you going to have your subs firing up for firing forward?  

[QUASIMOTO]

thanks for the help--

I would like my subs and port to face towards the rear of my trunk together. 

[QUASIMOTO]

Little back ground...

 

i made a sub up, port back (aero) which sounded great!

 

then I tried a 4th order which sounds horrible!

 

Now I wanna try a slot, and if doesn’t sound better than the aero, I’ll go back to it.

 

[Triticum Agricolam]

2 hours ago, QUASIMOTO said:

thanks for the help--

I would like my subs and port to face towards the rear of my trunk together. 

Got it.  

How much power are you running?

[QUASIMOTO]

Skar rp-1500

1 ohm at 1500

[Triticum Agricolam]

12 minutes ago, QUASIMOTO said:

Skar rp-1500

1 ohm at 1500

OK, here is how I would do it:

 

The port panel runs all the way until its 6" from the back panel. 

This should leave you with about 4.3 cu ft net of airspace tuned to 31 Hz.