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| Parameter | Unit Type | Description |
| Vas | volume | Volume of air equal to the speakers spring characteristics in liters. This is a Thiele Small specification or parameter. |
| Qts | unitless | Total Q of the speaker. This is a Thiele Small specification or parameter. |
| fs | hertz | Free air resonance of speaker in Hz. This is a Thiele Small specification or parameter. |
| Qtc | unitless | Total Q of the speaker and box . Also known as the total Q of the system. |
| Pd | length | Port diameter |
| # ports | unitless | Number of ports or vents installed |
| gain | decibel | db increase in the system |
| alignment | unitless | SBB4: Good response, Large enclosure, Low tuning frequency QB3: Slightly degraded response, Small enclosure, Lower F3 SC4: Degraded response, Large enclosure, Low tuning frequency |
| ripple | unitless | S = 0.5 - Degraded response pronounced ripple S = 0.6 - Slightly degraded response slight ripple S = 0.7 - Best transient response no ripple |