Woofer Lookup
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▸ Help me find the right woofer for my available airspace
Enter the space you have and we'll match woofers to it. We match against the room a finished box really takes — SoundQubed's published volume plus the woofer, port and bracing.
Narrow it down here, then confirm the build in enclosure software.
▸ Why these sizes look bigger
▸ Box design software
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Net Air vs. Space Needed
Two different measurements — this tool converts between them.
The published number
When a spec sheet says a woofer wants 1.00 ft³, that figure is net air inside the finished box — measured with the woofer, the port and the bracing already taking up their share. It isn't the size of the space in your vehicle.
What gets added back
The woofer — from its cone area and mounting depth. Roughly 0.02 ft³ on a 6.5″, about 0.49 ft³ on an 18″.
The port — ported boxes only, about 20% of net air. On most ported builds the port takes up more room than the woofer does.
Bracing — about 3%. Nothing this size gets built without it.
The port — ported boxes only, about 20% of net air. On most ported builds the port takes up more room than the woofer does.
Bracing — about 3%. Nothing this size gets built without it.
Where it's an estimate
The woofer and bracing figures are tight. The port is the loose one — port volume depends on your tuning frequency, and a lower tune means a longer port and less air left over. Across normal tunings the port runs somewhere around 10–35% of net air, and we use the middle of that range. So treat these as a starting point: narrow your choices here, then confirm the final box in enclosure software.
▸ See box design software
Box Design Software
Once you've narrowed down a woofer, these programs take its Thiele/Small parameters and work out the actual enclosure — including driver displacement, port volume and bracing.
WinISD ↗
Sealed, ported and bandpass. The long-standing free option — last release 2016 and still officially beta, but widely used.
BassBox 6 Pro ↗
Sealed, ported, bandpass and passive radiator, with graphs and an estimated in-car response.
Term-PRO ↗
Full enclosure design and cut-sheet package. Digital download, first year of maintenance included.
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| Part # | Head‑to‑Head | Price Sheet | Rival Data | Series | Size | RMS (W) | Peak (W) | Basket | Voice Coil | Mount Depth | Coil Len | FS (Hz) | SPL (dB) | BL | Xmax | Xmech | SD (cm²) | Le (mH) | Qms | Vas (ft³) | Qts | Qes | EBP | Enclosure Pref. | Sealed | Ported | Spec Sheet | MAP Price ($) |
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