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Subwoofer Box Design Comparison Calculator

Sealed Ported Bandpass Closed Vented

Low Frequency Enclosures - Car Audio - Home Theater Sound System


Description:

This page allow you to compare the different types of subwoofer box enclosures for a particular driver. The types include sealed, ported and bandpass enclosures. Some of the comparison parameters include box volume, frequency curve, -3 decibel point and box resonance frequency.

Calculator:

Subwoofer Box Comparison Calculator
1. Input/Enter Known Values:
Vas:
Qts:
unitless
fs:
hertz
Qtc:
unitless
Port Diameter:
# of Ports:
unitless
Gain:
decibel
Alignment:
SBB4QB3SC4
Ripple:
0.50.60.7
Output Units
Volume:
Length:
Graph: Output vs Frequency
Solution: Box Parameters


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Input Definitions:

Vas: (Thiele-Small):
- Volume of air equal to the speaker's spring characteristics
- Related enclosures: Sealed Ported Bandpass
- Obtained from speaker manufacturer
- Units: Volume
Qts: (Thiele-Small)
- Total Q of the speaker.
- Related enclosures: Sealed Ported Bandpass
- Obtained from speaker manufacturer
- Unitless
fs: (Thiele-Small)
- Free air resonance of speaker
- Related enclosures: Sealed Ported Bandpass
- Obtained from speaker manufacturer
- Units: Frequency in hertz
Qtc:
- Total Q of the speaker and box
- Related enclosure: Sealed
- User Defined (you choose a value)
- Unitless
Gain:
- dB or sound volume increase of the system
- Related enclosure: Bandpass
- User Defined (you choose a value)
- Units: Sound intensity in decibel
Ripple:
- S = 0.5 - Degraded response pronounced ripple
- S = 0.6 - Slightly degraded response slight ripple
- S = 0.7 - Best transient response no ripple
- Related enclosure: Bandpass
- User Defined (you choose a value)
- Unitless
Alignment:
- SBB4: Good response, Large enclosure, Low tuning frequency
- QB3: Slightly degraded response, Small enclosure, Lower F3
- SC4: Degraded response, Large enclosure, Low tuning frequency
- Related enclosure: Ported
- User Defined (you choose a value)
- Unitless
Pd:
- Diameter of the port or vent
- Related enclosures: Ported Bandpass
- User Defined (you choose a value)
- Units: length
# Ports:
- Quantity or number of ports
- Related enclosures: Ported Bandpass
- User Defined (you choose a value)
- Unitless

Output Definitions:

Vb:
- Vb - The airspace volume of the box. The volume of the subwoofer and any building material needs to be added to this value. For bandpass boxes, the volume includes both front and rear chambers
- Related enclosures: Sealed Ported Bandpass
- Units: Volume
Vf:
- Front chamber volume.
- Related enclosure: Bandpass
- Units: Volume
Vr:
- Rear chamber volume.
- Related enclosure: Bandpass
- Units: Volume
f3 or fl:
- lower -3db frequency
- Related enclosures: Sealed Ported Bandpass
- Units: Frequency in hertz
fh:
- higher -3db frequency
- Related enclosure: Bandpass
- Units: Frequency in hertz
fb:
- box frequency
- Related enclosures: Sealed Ported Bandpass
- Units: Frequency in hertz
Alignment:
- SBB4: Good response, Large enclosure, Low tuning frequency
- QB3: Slightly degraded response, Small enclosure, Lower F3
- SC4: Degraded response, Large enclosure, Low tuning frequency
- Related enclosure: Ported
- User Defined (you choose a value)
Pl:
- port length
- Related enclosures: Ported Bandpass
- Units: length

References - Books:

Lindeburg, Michael R. 1992. Engineer In Training Reference Manual. Professional Publication, Inc. 8th Edition.
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