Slot Port To Round Port Calculator
Overview: This is a calculator for designing a Labyrinth Vent Bass Reflex Enclosure. The formulas used in the calculator create a design that suggests the most maximally flat response in an anechoic environment based on the number of drivers, the thiele small parameters and the allotted dimensions specified in the user’s input fields. The calculatorContinue reading →. The area of the slot port should be the same as the area of the round port. Keep the length same. If you want to really optimize, usual the round ports are in the center away from the walls, whereas slot ports use the walls as one of the side - this does affect the lenght of the port for a particular tuning - Jeff B has a formula for calculating how much of the lenght should be altered if you. From my experience, aero ports are louder and slot ports sound better. But thats only because of a few limits of the aero port. They only come 17' long. So if you want a lot of port area, the ports cant be long enough to be able to tune low. So with the higher tuning you lose low end output. A slot port can be as big and long as you want it to be. They are just not as efficient. The port rotation of the ship; Whether there will be any restows en route or not; A shipping line has to take all of this into account before they advise the client the details of the lost slots and its associated costs. This is also the reason that the shipping lines sometimes take a while to advise you the costs for OOG cargo, so please be. Calculate Length of Vent or Port. L = Length of Vent or Port D = Diameter of Vent N = Number of Ports V = Volume of Box F = Tuning Frequency K = End Correction Factor. Enter your values: Diameter of Vent.
Port Area Calculator
Slot Port Design
The box port can be calculated with a simple formula. Box volume in cubic feet X 16 (the amount of port area in square inches per cubic feet of box volume). For example, 3.4 cuft X 16 sqin= 54.5 square inches of port area. Try to stay within 10% of this number.
The port length should be 16 inches deep. This tunes the boxes to about 40 Hz.
How To Make A Slot Port
The easiest and most effective way to build a port is to use a slot shaped port that uses 3 sides of your enclosure as port walls. If the port is located at one end of the box, only one additional piece of wood is required to complete the port. The additional piece of wood should be spaced off the end of the box.
The port area is in square inches, meaning it takes height times width to calculate total area. A port 4 inches high by 4 inches wide would calculate as 4 X 4= 16 square inches.
In our example box, we have an inside height of 14.5 inches. To calculate the slot width that would make a total area of 54.5 square inches, and we use 14.5 inches as the height: divide 54.5 by 14.5= 3.76. Round that figure to nearest ¼ inch, and you get an offset measurement of 3 ¾ inch wide. The slot port would be 3 ¾ inches wide by 14 ½ inches tall.
You don’t have to get too critical about the box and port volume, a good rule of thumb is that if you stay within 5-10% of calculated volumes, there will be very little if any audible effects.
Port Length Obstructions
Some port lengths do not allow for 16-inch port depths without some sort of modification. The rule of thumb is not to let the end of the port get any closer to the back wall than the width of the port. So back to our example, we have an internal box depth of 12.5 inches. We need a 16-inch deep port. We will have to bend the port along the back wall to get the full port length. To calculate where to make the bend, subtract the port width from the inside box depth. 12.5 – 3.75=8.75. We must bend the port at 8.75 inches, then continue the port parallel to the back wall for an additional 7.25 (8.75+7.25=16).
You now have an L shaped port totaling 16 inches in depth.
WHY GO PORTED?