Box Volume Worksheet

Fill this in before you cut any wood. Measure twice, cut once.

My sub and box

ItemMy number
Sub size (inches) 
Sub RMS power (watts) 
Sub Vas (from the spec sheet, if listed) 
Sub final impedance (ohms) 
Box type I want (sealed or ported) 

Box volume

StepNumber
Inside width (in) 
Inside height (in) 
Inside depth (in) 
Volume = W x H x D, then divide by 1728 for cubic feet 
Minus sub displacement (about 0.1 to 0.2 cu ft for a 12 inch) 
Net volume I want 

Check before I build

  • Volume matches what the sub manufacturer recommends
  • I checked the final impedance with the wiring plan
  • I have the right materials and tools (for example, 3/4 inch MDF)
  • I can say what to set the amp gain to later

Next: Box Size Calculator, Port Length Calculator, Wiring Wizard.

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