Wall tune help

[los33 10+ year member]

To get to the point, this is how the wall looks like:

Both sides and bottom are double baffle 3/4 and top is single 3/4.

It will be braced with dowels and will have support above as i continue build.

The port is 8in wide and 8.5in long with double baffle.

This is the measurements and tune specs:

Does this seem ok tuned to 34-35hz for 4 hdc3 18's?

Click to read more...

 

[mlstrass 5,000+ posts]

you need around double that port area for those subs in that enclosure. That's one reason the port is so short. Shoot for 16-18^2 per net cube....

If you have room I'd do some external 2x4 braces on the top as that's a big panel to be single layer...

 

[los33 10+ year member]

you need around double that port area for those subs in that enclosure. That's one reason the port is so short. Shoot for 16-18^2 per net cube....
If you have room I'd do some external 2x4 braces on the top as that's a big panel to be single layer...

Ill have the external and internal bracing in place soon..

Hmmm.. Haha what exactly does that mean? Im not 100% on tuning.

Im just kind of going with whats being shown on the app

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[Massive spl]

Port area per ft, your at 9" right now shoot for like 11"-14"... My old cpillar for 4 18s was around 22cubes with 270" of port 22" deep. It played great from 20s-50hz.

 

[los33 10+ year member]

you need around double that port area for those subs in that enclosure. That's one reason the port is so short. Shoot for 16-18^2 per net cube....
If you have room I'd do some external 2x4 braces on the top as that's a big panel to be single layer...

Port area per ft, your at 9" right now shoot for like 11"-14"... My old cpillar for 4 18s was around 22cubes with 270" of port 22" deep. It played great from 20s-50hz.

I actually messed up on port height so i fixed that and played with the port size and length and i am at 16 sqft per net..

This still kept me at 35hz.

 

[Massive spl]

That's pretty high tuning. I've never tuned a wall higher then 32hz and they all sounded good... The length of the port will change the tuning

 

[mlstrass 5,000+ posts]

36Hz with those subs will play into the high 20's without issue. If you plan to play in the 20's a lot I'd drop tuning to around 34hz. I've built a lot of 4 18's walls with SQ/DD subs....

 

[Jeffdachef 5,000+ posts]

I actually messed up on port height so i fixed that and played with the port size and length and i am at 16 sqft per net..This still kept me at 35hz.

you got some numbers all wrong buddy.

If its that exact same dimensions and its 1.5 inch thick all around then the port height has to be 39-3=36 not 37.75

HDC3 18s are .26 cubic feet of displacement so its 1.04 for subwoofer displacement not .92

What you have there is 5.25 cubic feet per sub and they wont be liking that.

You'll also need to figure out common port walls aka how many walls of the box will act as a port wall, it'll help regain some airspace back.

You might have to consider thinking about going bigger with the dimensions or Going with an aeroport or octoport setup instead. You really do not have the airspace right now to run 4 18s properly. Especially if you plan on sticking with slot port.

 

[los33 10+ year member]

you got some numbers all wrong buddy.
If its that exact same dimensions and its 1.5 inch thick all around then the port height has to be 39-3=36 not 37.75

HDC3 18s are .26 cubic feet of displacement so its 1.04 for subwoofer displacement not .92

What you have there is 5.25 cubic feet per sub and they wont be liking that.

You'll also need to figure out common port walls aka how many walls of the box will act as a port wall, it'll help regain some airspace back.

You might have to consider thinking about going bigger with the dimensions or Going with an aeroport or octoport setup instead. You really do not have the airspace right now to run 4 18s properly. Especially if you plan on sticking with slot port.

No i got it all correct. And i only have a single common wall so it is not a l-port.

http://www.soundqubed.com/Subwoofer-Displacement_ep_83.html

^^^^ 18's are .23 displacement... My actual net cuft is 21cuft so the 18's are in recommended space.

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[Jeffdachef 5,000+ posts]

No i got it all correct. And i only have a single common wall so it is not a l-port.
Subwoofer Displacement

^^^^ 18's are .23 displacement... My actual net cuft is 21cuft so the 18's are in recommended space.

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They like 6 cubic feet or more man. 5.25 is far from optimal.

You cannot choose 1.5 for wood thickness of the calculator if your top part is only .75 Its better to just subtract the 2nd layer of wood thickness all around from your dimensions and use .75 thickness for your box calculations.

Your port is not a single common chamber. Your illustration shows you are using top, bottom and side thats 3 not 1.

One would be this



Two would be this.



Yours is three and you are not gonna get an accurate common port chamber measurement if you use 1.5 wood thickness and your current height measurement the calculator wont read it properly.

 

[los33 10+ year member]

They like 6 cubic feet or more man. 5.25 is far from optimal.
You cannot choose 1.5 for wood thickness of the calculator if your top part is only .75 Its better to just subtract the 2nd layer of wood thickness all around from your dimensions and use .75 thickness for your box calculations.

Your port is not a single common chamber. Your illustration shows you are using top, bottom and side thats 3 not 1.

One would be this



Two would be this.



Yours is three and you are not gonna get an accurate common port chamber measurement if you use 1.5 wood thickness and your current height measurement the calculator wont read it properly.

Ohhhh //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif mybad jeffdachef! Going off on me //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif..

I actually went off andrews (blacknasty) advice to get the wall right.

Hes the one who told me for the power i have that i should make the net 20-21 for optimal use. Ive played tons of tones and it peaks at 35hz. I still need to test on a mic to see where im really at.

Either way im still reading up so when i am ready to rebuild because as it is this wall is poorly put together.. It holds and does the job, but still poor.

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[Jeffdachef 5,000+ posts]

Ohhhh //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif mybad jeffdachef! Going off on me //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif..
I actually went off andrews (blacknasty) advice to get the wall right.

Hes the one who told me for the power i have that i should make the net 20-21 for optimal use. Ive played tons of tones and it peaks at 35hz. I still need to test on a mic to see where im really at.

Either way im still reading up so when i am ready to rebuild because as it is this wall is poorly put together.. It holds and does the job, but still poor.

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The power he stated in this statement is clamped power. A bigger box does wonders for the lows though since it sounds like thats what you are going for. You also need to factor in a lot of bracing too. If you model it out on winisd, a smaller box will move your peak up higher. Generally better for music with more upper bass, which is what andrew demos a lot of. His gets low, but never with very strong authority, most of his hair tricks are from the 40hz range. Which is okay if thats what you are going for. If you want under 40hz, you'll want the box a bit bigger.

HDC3 current version

1k input power

HDC310 - 1.5 cube net with 17 sq inch port area per cube - tune between 36-41 hz

HDC312 - 2.5 cube net with 17 sq inch port area per cube - tune between 34-39 hz

HDC315 - 4.0 cube net with 17 sq inch port area per cube - tune between 35-40 hz

HDC318 - 5.5 cube net with 17 sq inch port area per cube - tune between 33-38 hz

2k input power

HDC310 - 1.25 cube net with 16 sq inch port area per cube - tune between 36-41 hz

HDC312 - 2.25 cube net with 16 sq inch port area per cube - tune between 34-39 hz

HDC315 - 3.75 cube net with 16 sq inch port area per cube - tune between 35-40 hz

HDC318 - 5.25 cube net with 16 sq inch port area per cube - tune between 33-38 hz

 

[los33 10+ year member]

The power he stated in this statement is clamped power. A bigger box does wonders for the lows though since it sounds like thats what you are going for. You also need to factor in a lot of bracing too. If you model it out on winisd, a smaller box will move your peak up higher. Generally better for music with more upper bass, which is what andrew demos a lot of. His gets low, but never with very strong authority, most of his hair tricks are from the 40hz range. Which is okay if thats what you are going for. If you want under 40hz, you'll want the box a bit bigger.
HDC3 current version

1k input power

HDC310 - 1.5 cube net with 17 sq inch port area per cube - tune between 36-41 hz

HDC312 - 2.5 cube net with 17 sq inch port area per cube - tune between 34-39 hz

HDC315 - 4.0 cube net with 17 sq inch port area per cube - tune between 35-40 hz

HDC318 - 5.5 cube net with 17 sq inch port area per cube - tune between 33-38 hz

2k input power

HDC310 - 1.25 cube net with 16 sq inch port area per cube - tune between 36-41 hz

HDC312 - 2.25 cube net with 16 sq inch port area per cube - tune between 34-39 hz

HDC315 - 3.75 cube net with 16 sq inch port area per cube - tune between 35-40 hz

HDC318 - 5.25 cube net with 16 sq inch port area per cube - tune between 33-38 hz

I highly doubt i can go much bigger without doing a blow through.

At the moment anything under 35hz really does have authority, but hitting 27hz it starts to roll off.

40hz and above is brutal.

Still need more bracing tho since my wall flexes like crazy.

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[Jeffdachef 5,000+ posts]

I highly doubt i can go much bigger without doing a blow through.
At the moment anything under 35hz really does have authority, but hitting 27hz it starts to roll off.

40hz and above is brutal.

Still need more bracing tho since my wall flexes like crazy.

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My buddy Hunter has the same 4 hdc3 18s setup on a banda 7k

His setup hits down to the low 20s hard. He has a little over 7 cubes per, It still hits every bit as hard in the upper ranges too.

 

[los33 10+ year member]

My buddy Hunter has the same 4 hdc3 18s setup on a banda 7k
His setup hits down to the low 20s hard. He has a little over 7 cubes per, It still hits every bit as hard in the upper ranges too.

It must be the power, i currently run my sq 4500.1 at .5 ohm, but only half gain.

Currently havent put my quad alts back in yet, but the single singer alt i have still has more juice to push.

How is that guys box braced from the inside?

My wall has imploded twice with how violent 36hz and up are. Each joint is kreg jigd on both sides top and bottom and sides and glued to hell.

Still have to put in my wooden dowels to sustain the sub area

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