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Subwoofer:Amplifier Impedance Chart
Use this handy chart to take the guesswork out of deciding what impedance woofers to purchase. Once you have purchased the woofers, it will be important to make sure to wire them properly to get the correct impedance. You will want to check your amplifier to see the lowest impedance that it will run safely. If it doesn't show a power rating at 1 Ohm, it means it is not 1 ohm stable and you should select woofers for the 2 ohm or 4-ohm impedances. If your amp does not show a rating at 2 ohms, then it means it is not 2 ohms stable and you should select a configuration at 4 ohms.
It is very important to pay attention to whether the subwoofer(s) is a single or dual voice coil. This will have a big impact on how the subwoofers are wired in order to achieve the desired final impedance.
SVC = Single Voice Coil
DVC = Dual Voice Coil
| Amplifier Impedance | 1 Ohm | 2 Ohm | 4 Ohm |
| # Of Woofers | |||
| 1 Subwoofer | 1 Ohm SVC 2 Ohm DVC |
1 SVC 4 Ohm DVC |
4 Ohm SVC 2 Ohm DVC (Wired in Series) |
| 2 Subwoofers | 2 Ohm SVC 4 Ohm DVC |
1 Ohm SVC 4 Ohm SVC 8 Ohm DVC |
2 Ohm SVC 1 Ohm DVC |
| 3 Subwoofers | 4 Ohm SVC (1.34 Ohm Load) 2 Ohm DVC (1.34 Ohm Load) |
8 Ohm SVC (2.67 Ohm Load) 4 Ohm DVC (2.67 Ohm Load) 2 Ohm DVC (3 Ohm Load) |
|
| 4 Subwoofers | 2 Ohm DVC 4 Ohm SVC |
2 Ohm SVC 4 Ohm DVC |
2 Ohm DVC 4 Ohm SVC |
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