New box! Pair of 18 LMS ULTRAS

[FISHKILLER 10+ year member]

Two nine inch inside diameter ports. My tuning looks like it will be 29 Hz. Subtly changes in port length as I lower my tuning then higher box displacement with longer port, you know the quandary. A single 9 inch will give me 63 inches of port. Borderline but thinking it will suffice.

As far as the box building goes, I HAD to build a T line! Would have lost sleep otherwise.

Will work on some pictures.

 

[FISHKILLER 10+ year member]

My first official posted picture ever. Funny. Gonna be firing away now, watch out!

This is my T line box under construction.

 

[FISHKILLER 10+ year member]

SUb in T line

Hopefully yall can see these?

 

[FISHKILLER 10+ year member]

Hey guys.

Few more questions. MY box size and shape is requiring me to run a nine inch aeroport. Needless to say a nine inch will have to be custom made. Not wanting to wait either to be honest, ready to get this all back together. This is my question, I can fit a pair of six inch ports fairly easy, per sub, but I need just a touch more area then they will provide. Two six inch will give me just under 57 inches of port area per sub. Adding a four inch to the equation would be just right giving me almost seventy inches of port area per sub.

How do I figure different size ports? All the calculators I have seen you have to use same size ports in multiple port configuration.

Also I am seeing a slight discrepancy between calculators. PSP and TORRES have been my ones of focus nut there numbers are a little off. ANy insight on this would be great guys. Planning on building box this week.

Rain got me all weekend, or most of it anyway, I did manage to stiffen, deaden and seal my Q logic kick panels and installed those with my ID XS 65 and 68. Today My plan is to do all my battery stuff and get rest of my panels back in my truck deadened and rattle free. Possibly start on doors for my other pair of ID mid and high.

Any help with the odd aero sizing would be awesome also some insight on the calculators as well. Yall have a great day!

 

[Inferno333 10+ year member]

I would not mix sizes.

 

[treesive 10+ year member]

Don't skimp on port area. The ultra will want it and you won't get the sound it is known for if it is choked

 

[FISHKILLER 10+ year member]

I am trying not to skip on port area for sure. Would really like to add a 4 inch port to a pair of six inch ports. That would work out so nice for me. I just cant quite fit a ten incher in my area but two sixes and one four would be perfect for me. Just gotta figure out the tuning for different size ports.

Inferno, why you say no on the different sizes? If it is a no no on the different sizes I will figure something else out for sure.

 

[Inferno333 10+ year member]

They will not pressurize the same. The 4" will be maxed out well before the 6" ones.

Personally, I'd rather run one driver in a perfect enclosure than run two with a suboptimal one.

 

[treesive 10+ year member]

They will not pressurize the same. The 4" will be maxed out well before the 6" ones.
Personally, I'd rather run one driver in a perfect enclosure than run two with a suboptimal one.

Agree with this

 

[FISHKILLER 10+ year member]

Ok that makes perfect sense about the odd size ports! I am going to use and optimal enclosure, at least that is my goal. I have been brain storming and think I may be able to get a ten inch port to work for me.

What about the issue of different port calculation sites coming up with a tad bit different tuning? Any insight on that?

 

[Inferno333 10+ year member]

I've always used the calculator on the Precision Port website. Hasn't failed me yet.

 

[T3mpest 10+ year member]

no box program is taking enough factors into account to en that accurate in the real world.. exper a 1hz deviation at least from your goal tuning.. its inaudible regardless.. you need port area though, especially if you tune low.anything above 25m/s in winisd is NOT A GOOD PORT if your tuning at 30hz or below... Can yoi fit passive radiators? sounds like that may be the way to go here.

 

[FISHKILLER 10+ year member]

On the TC website it suggests several different box configurations for vented enclosures. One using 4 4" ports the other two using 6 4" ports. My box size falls in between there recommended small size box and medium size box. My plan now is to use 5 4" ports. Tuning to 30 hz I will be able to fit all ports inside box nicely. After sub, bracing, and port disp, I will be at 5 cubes per sub. WIll fit nicely in my space and give my ports a little more area to breathe on the outside of my box which I had worries about with a single large port. I will have at least 4 inches of clearance, maybe a touch more where ports are placed. Think it will work out nicely for me. Should start construction tomorrow.

 

[FISHKILLER 10+ year member]

https://imageshack.com/i/n6ovsoj

 

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https://imageshack.com/i/neeaxbj

 

[FISHKILLER 10+ year member]