NEED HELP WITH BUILDING A BOX (port size )

[Robert Ford]

I have a 15 orion hccasplx 15 and for power i have a tarramps 12000.1 at 0.5 ohms i just want a slot ported box but can anyone help me figure out the perfect cubic ft for enclosure and the size of port. I want it tunned to 38 hrz

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[CarAudio.com - Hal AI Bots]

I have a 15 orion hccasplx 15 and for power i have a tarramps 12000.1 at 0.5 ohms i just want a slot ported box but can anyone help me figure out the perfect cubic ft for enclosure and the size of port. I want it tunned to 38 hrz

To design a slot ported enclosure for your Orion HCCA SPLX 15 subwoofer tuned to 38 Hz, you'll need to start with a few considerations for volume and port dimensions.

### Recommended Enclosure Volume
For a 15-inch subwoofer like the Orion HCCA SPLX, a good enclosure volume typically ranges from **3.5 to 5.5 cubic feet** for a ported design, depending on your specific goals (SPL vs. sound quality). A volume of around **4.0 to 4.5 cubic feet** is a solid choice for achieving a good balance between SPL and sound quality, particularly when tuned to 38 Hz.

### Tuning Frequency and Port Size
To achieve a tuning frequency of 38 Hz, you can use the following formula to determine the port size. The dimensions of the port will depend on how you decide to configure it, but for slot ports, you'll generally want to calculate the following:

1. **Determine the port area**: Generally, you'll want the port area to be around **12-16 square inches** per cubic foot of enclosure. For a 4.0 cubic foot box, a port area of around **48 to 64 square inches** would be acceptable.

2. **Port Length**: Once you have the area, you can calculate the port length using a slot port formula or port calculators available online. From experience, the length of a port can usually be estimated around **8 to 14 inches**, but variable based on height/width of the slot and your specific design.

### Example Calculation
For example, if you design a box with 4.0 cubic feet of internal volume and choose to use a port that is 6 inches tall and 10 inches wide:

- **Area of Port**: 6 inches x 10 inches = 60 square inches.

Now, using a port calculator or software to extract the exact length needed for a 38 Hz tuning will help, but generally, with **60 square inches**, you might find the port length needed around **15-18 inches** (this is just a rough estimate and should be validated with a calculator).

### Final Design
1. **Box Dimensions**: Aim for a box around **4.0 - 4.5 cubic feet**.
2. **Port Dimensions**: A slot port 6 inches high and 10 inches wide, around 15-18 inches long for tuning.
3. **Bracing**: Consider adding internal bracing to minimize flexing of the enclosure.

Lastly, it's always a good idea to test with audio equipment or measurement tools like a frequency analyzer to fine-tune your port length or box volume based on real-world performance after construction.

 

[Doxquzme Premium Member]

Fs is around 38hz, tune it to 35 hz. Slot ported, NET is 4 cu ft. Set the subsonic filter to 1/2 octave below 35 hz or around 25-26 hz.

Box External Dimensions Width x Height x Depth	32.00" x 16.50" x 20.59"
Material Thickness	0.75"
Net Internal Volume	4.00 ft3
Tuning Frequency	35 Hz
Port Area	60.00 inch2
Port Inlet Width x Height	4.00" x 15.00"
Port Length	23.52"

 

[Robert Ford]

Fs is around 38hz, tune it to 35 hz. Slot ported, NET is 4 cu ft. Set the subsonic filter to 1/2 octave below 35 hz or around 25-26 hz.

Box External Dimensions Width x Height x Depth	32.00" x 16.50" x 20.59"
Material Thickness	0.75"
Net Internal Volume	4.00 ft3
Tuning Frequency	35 Hz
Port Area	60.00 inch2
Port Inlet Width x Height	4.00" x 15.00"
Port Length	23.52"

Thank you for. Thatwhat about cabin like how do you figure out your cabin frequency

 

[Robert Ford]

To design a slot ported enclosure for your Orion HCCA SPLX 15 subwoofer tuned to 38 Hz, you'll need to start with a few considerations for volume and port dimensions.

### Recommended Enclosure Volume
For a 15-inch subwoofer like the Orion HCCA SPLX, a good enclosure volume typically ranges from **3.5 to 5.5 cubic feet** for a ported design, depending on your specific goals (SPL vs. sound quality). A volume of around **4.0 to 4.5 cubic feet** is a solid choice for achieving a good balance between SPL and sound quality, particularly when tuned to 38 Hz.

### Tuning Frequency and Port Size
To achieve a tuning frequency of 38 Hz, you can use the following formula to determine the port size. The dimensions of the port will depend on how you decide to configure it, but for slot ports, you'll generally want to calculate the following:

1. **Determine the port area**: Generally, you'll want the port area to be around **12-16 square inches** per cubic foot of enclosure. For a 4.0 cubic foot box, a port area of around **48 to 64 square inches** would be acceptable.

2. **Port Length**: Once you have the area, you can calculate the port length using a slot port formula or port calculators available online. From experience, the length of a port can usually be estimated around **8 to 14 inches**, but variable based on height/width of the slot and your specific design.

### Example Calculation
For example, if you design a box with 4.0 cubic feet of internal volume and choose to use a port that is 6 inches tall and 10 inches wide:

- **Area of Port**: 6 inches x 10 inches = 60 square inches.

Now, using a port calculator or software to extract the exact length needed for a 38 Hz tuning will help, but generally, with **60 square inches**, you might find the port length needed around **15-18 inches** (this is just a rough estimate and should be validated with a calculator).

### Final Design
1. **Box Dimensions**: Aim for a box around **4.0 - 4.5 cubic feet**.
2. **Port Dimensions**: A slot port 6 inches high and 10 inches wide, around 15-18 inches long for tuning.
3. **Bracing**: Consider adding internal bracing to minimize flexing of the enclosure.

Lastly, it's always a good idea to test with audio equipment or measurement tools like a frequency analyzer to fine-tune your port length or box volume based on real-world performance after construction.

Thank you for all that info i really appreaciate you taking the time to explain all. That to me. . One auestion can you explain about getting your cabin to match your speakers

 

[Doxquzme Premium Member]

Thank you for. Thatwhat about cabin like how do you figure out your cabin frequency

You need a Mic, a program like REW and then you can put the box in the cabin and measure it. Otherwise, may want to join a forum specific to the vehicle or spend some time perusing google to see if any one else has already established that.