Calculators
Speaker box calculators
Quick answers for speaker boxes, worked out with the same model as 00 Simulator, with the reasoning shown. Open the full simulator when the design needs more.
Start with a driver
Design the box
Pick a driver from the library or paste its T/S values, and see how it behaves in the box.
Subwoofer box calculator
Uses a driverSealed or ported? Starting boxes for your driver side by side, by size, extension and the most each can play, with a pick for your goal.
Example: ported 79 L reaches 31.3 Hz; sealed 38 L, 58.9 Hz
Open calculatorSealed box calculator
Uses a driverThe box volume for the Qtc you want, or the Qtc of a box you have, with the response, F3 and cone excursion of a real driver.
Example: 37.6 L for Qtc 0.707, F3 58.9 Hz
Open calculatorPorted box calculator
Uses a driverVolume and tuning for a flat vented alignment, with the port to build, the response against sealed, cone excursion and port air speed.
Example: 79 L tuned to 30.8 Hz, F3 31.3 Hz
Open calculatorBuild and check
Build it
Turn a volume into a cabinet, cut the port to length and check its air speed.
Speaker box volume calculator
No driver neededNet volume from outside or inside dimensions, the depth for a target volume, or a whole box in golden-ratio proportions, with a cut list.
Example: 386 mm × 586 mm × 330 mm in 18 mm board, 50.0 L net
Open calculatorBass-reflex port calculator
No driver neededPort length for any box and tuning, or the tuning of a port you have. Round or slot, with other sizes, a trim guide and a fit check.
Example: 50 L at 30 Hz with a 100 mm port, 460 mm long
Open calculatorPort velocity calculator
Uses a driverAir speed in the port across the bass range with a real driver, power and high-pass filter, and the cone excursion alongside.
Example peak: 16.9 m/s at 26 Hz with 130 W
Open calculatorNeed impedance, group delay, EQ or several designs on one graph? The simulator does all of that, horns and bandpass boxes included, and the calculators that design a box can open it there.