Critique the Box

[Buck 5,000+ posts]

Lord. My head hurts. I'll keep my day job.

I saw the post before you edited and you were right for the most part man.

 

[acreature 10+ year member]

The general rule of thumb for port area is 12-16 sqin. per cubic foot. You have 1 cube, so you need 12 - 16 sqin. of port. With a 1.75" wide port, you have roughly 19 in^2 of port area -- which isn't necessarily a bad thing. Ideally for smaller boxes you want to keep the port ratio to 1:8. The minimum port width I would do with a port that's 10.5" tall is ~1.25".

So, 1.5" would be ideal = 15.75 in^2

 

[Kangaroux 5,000+ posts]

So, 1.5" would be ideal = 15.75 in^2

Yeah pretty much. The more port you have the peakier it will be so if you want something with a flatter response go with the 1.5"

 

[acreature 10+ year member]

Aiight. Appreciate the patience and advice.

 

[hispls 5,000+ posts]

I have never messed with that idea. Not sure if I want to after doing a quick read. Above my pay grade and skill level. //content.invisioncic.com/y282845/emoticons/redface.gif.62fdbfe1a101588a808c4cff71bcb942.gif

Just expensive. Buy one of the TC sounds ones from Parts express and you can add and remove mass in guess and test fashion until you acheive desired tuning.

 

[acreature 10+ year member]

My have to play with that idea. On a one month staycation, so I will be wasting a lot of time in the tool shed.

 

[Kangaroux 5,000+ posts]

My have to play with that idea. On a one month staycation, so I will be wasting a lot of time in the tool shed.

You can also try playing around with an aero port if you want. The problem with small boxes is the port takes up a ton of space compared to the actual box size itself which is why most people end up doing an external port.

 

[Moble Enclosurs 10+ year member]

Do nt go by general rules of port area, because they do not take into consideration power requirements or port velocity (indirect parameter). There are two possible errors with lowering port area.

1. Increased potential of port noise

2. Decreased efficiency and coupling capabilities

So, if you want to challenge yourself with those two possible factors of decreasing port area, make sure you know what you are dealing with as far as power. A balance between the two needs to be met to get the most out of the design if you do not plan to increase dimensional volume.

In this scenario, the ideal layout is great that you have. Just have to make sure it works in all aspects of the design.

I can tell visually right now, that it was correct to say the port may be quite long. BUT this can also increase the low output NOT FROM TUNING, but from correct phasing. SO, in reality, if you want more out of a design, (listen up all), do not give port area a limitation, and do not give port length a limitation UNLESS you are limited physically in dimensions and space. Then those factors need more controlled attention.

 

[acreature 10+ year member]

You can also try playing around with an aero port if you want. The problem with small boxes is the port takes up a ton of space compared to the actual box size itself which is why most people end up doing an external port.

I will. I will build the slot vent first, then play with other ideas.... including the aero and passive radiator.
Here is where I am with the 1.5" port width

It is 35.25" port length. I am going to have to block the inside a bit to get the cubes back down to 1.

 

[acreature 10+ year member]

Do nt go by general rules of port area, because they do not take into consideration power requirements or port velocity (indirect parameter). There are two possible errors with lowering port area. 1. Increased potential of port noise

2. Decreased efficiency and coupling capabilities

So, if you want to challenge yourself with those two possible factors of decreasing port area, make sure you know what you are dealing with as far as power. A balance between the two needs to be met to get the most out of the design if you do not plan to increase dimensional volume.

In this scenario, the ideal layout is great that you have. Just have to make sure it works in all aspects of the design.

I can tell visually right now, that it was correct to say the port may be quite long. BUT this can also increase the low output NOT FROM TUNING, but from correct phasing. SO, in reality, if you want more out of a design, (listen up all), do not give port area a limitation, and do not give port length a limitation UNLESS you are limited physically in dimensions and space. Then those factors need more controlled attention.

No one can make this easy for an occasional hobbyist, ha!

 

[Moble Enclosurs 10+ year member]

//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

 

[acreature 10+ year member]

Just for shitz-n-gigglz, what if I wanted a dual slot port for the 1cu. (Just for the look) A slot on left and right sides of the woofer. Is there a way to figure that with no more or less than a 1.5" x 10.5" slot dimension for each port? Or would the ports be so long as to make the enclosure too huge for a measly 1cu?

The woofer is only going to have 400w (rms rating) going to it.

 

[Kangaroux 5,000+ posts]

I will. I will build the slot vent first, then play with other ideas.... including the aero and passive radiator.
Here is where I am with the 1.5" port width

It is 35.25" port length. I am going to have to block the inside a bit to get the cubes back down to 1.

I would remove that little piece at the end of the port and just extend that back piece so it's 1.5" from the side. That small of a difference in length isn't going to yield much audible difference, and it's just a pain if anything

 

[acreature 10+ year member]

Agreed.

 

[VisceralSound 10+ year member]

Do nt go by general rules of port area, because they do not take into consideration power requirements or port velocity (indirect parameter). There are two possible errors with lowering port area. 1. Increased potential of port noise

2. Decreased efficiency and coupling capabilities

So, if you want to challenge yourself with those two possible factors of decreasing port area, make sure you know what you are dealing with as far as power. A balance between the two needs to be met to get the most out of the design if you do not plan to increase dimensional volume.

In this scenario, the ideal layout is great that you have. Just have to make sure it works in all aspects of the design.

I can tell visually right now, that it was correct to say the port may be quite long. BUT this can also increase the low output NOT FROM TUNING, but from correct phasing. SO, in reality, if you want more out of a design, (listen up all), do not give port area a limitation, and do not give port length a limitation UNLESS you are limited physically in dimensions and space. Then those factors need more controlled attention.

Yeah Jason way to make shit complex //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

Don't worry your design is better than anything I could make by myself.