Subwoofer wiring and Subwoofer enclosure calculators. Fraction to Decimal, Parallel wiring, Series wiring, Port Length and Volume Calculators. Now buy all the tools, wood, and supplies that you need to build the box and set up the subwoofer. Tip There are many varieties of wood out there to choose. PORT Size Calculations and Formulas for WOOFER and Subwoofer BOXES. Subwoofer Enclosure Calculators, Parallel, Series, Port Length and Volume. Sealed Subwoofer Box Enclosure Design Software Example Speaker Cabinet Program. This is an example on how to use AJ Sealed Designer to build a sealedclosed enclosure. The following will be discussed. SpeakerDriver Specifications. SpeakerDriver Selection. Input Parameters. Box Results. Box Designer. Box Construction. The following speaker parameters were provided with the data sheet that came with a 1. Qes 0. 4. 9Fs 2. Hz. Vas 3. 2. 3 ft3. Vas 9. Vas in litersPmax 1. Diameter 9 inches. Langsung Main Point Blank Tanpa. Diameter 2. 1. 9 cm. Xmax 4. 0 mm. Note, the input for diameter is 9 inches not 1. The diameter is the measured diameter of the actual speaker cone. Do not include the speaker frame diameter for this value. Speaker parameters should have come in the packagingliterature with speaker. Ballantyne Pro 35 projector Ballantyne Pro70 special venue Ballantyne Pro3570 instruction manual Bauer U2 3570 film path parts projector manual. BW subwoofer amp repaired By Riaan Diedericks. Resource for building, calculate and measuring Hi Fi Loudspeakers, DIY LoudspeakerSite, Acoustic treatment, loudspeaker calculations, hifi links, high end. If they are not available contact the manufacture to obtain any missing speaker parameters. Also, most manufactures have their current driver data on their web sites. Sometimes, a speaker is designed or engineered for a specific enclosure. On the other hand, a majority of woofers can be used in various enclosure types. As a rule of thumb, use the following equation to determine the suitability of your speaker. Suitability factor fs Qes. Factor less than 5. Factor between 5. Factor above 1. 00 the driver is best suited for a vented enclosure. Use these factors as an estimation. For example if you want to build a sealed enclosure and the factor of the speaker is 5. The speaker suitability value is in the vicinity of the sealed factor. The speaker being used has a Suitability factor of 5. This was determined by the following calculation Suitability factory fsQes 2. The speaker parameters are entered into Sealed Box Designer Speaker Parameters group box. Qtc is a user defined parameter. Qtc is related to the amount of dampening the enclosure will provide the back surface of the speaker cone. As the box size increases, dampening decreases, because there is more air space. Higher Qtc values increase the dampening effect and decrease volume. There is no perfect value for Qtc. Values between 0. A value of 0. 7 will give a flat response. Note how the volume of the box Vas increases or decrease as the value of Qtc is varied. A Qtc of 0. 9 was chosen, because the enclosure is going into the trunk of a car and space is an issue. A higher Qtc results in a smaller box. The following parameters were calculated after pressing the Calculate button. A Vb of 3. 2. 3. 5 liters results in a relatively small box with a F3 of 4. Hz. The F3 value will provide good bass extension, because a sealed enclosure has a 1. Boctave roll off. A vented enclosure have a 2. Boctave roll off. The Frequency Response vs. Frequency plot is as follows. Note how a hump or dip develops and how the F3 value changes as you increase or decrease Qtc. Next, the Box Designer function is used to calculate the internal dimensions of the box. The box dimensions using the Golden Rule calculations are as follows. Doing some conversions, the dimensions of the box are determined in English units. Length L 3. 1. Width W 5. Depth D 1. 9. After checking the dimensions of the speaker, it was determined that constraining was not needed to make the speaker to fit in the box. The constrain function is used when you are limited by the speaker size or wish to set a dimension at a set value. Remember, Box Designer determines the internal dimensions of an enclosure. Building material thickness will have to take into account when building the enclosure. The boards dimensions used for construction are as follows. Note how the board dimensions are used to enclose the internal dimensions. For more information on Sealed Box Calculator, click here. Note the following when building an enclosure. Needs to be strong enough to withstand the energy produced by the driver. Needs to be airtight. The following materials and parts are suggested for construction. Do not use nails. Nails will vibrate out of the wood. High quality wood glue Elmers wood glueSilicon caulk. For larger boxes, an internal brace should be installed to prevent excessive vibration. Apply wood glue to all fastening joints. The glue provides additional strength to the joints. Apply silicon caulk to all internal joints. This will ensure any leaks in the enclosure are sealed. A small leak can produce noticeable noise and degraded sound output of the enclosure.