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It’s the amount of resistance that the speaker has, the lower the ohm the more watts an amp can produce. Normally car audio speakers are 4-ohm we’re house speakers are 8-ohm. If your amp is rated at 400-watt at 4-ohm then these subs would work nice if an amp is rated 400-watt at 2-ohm then putting a 4-ohm speaker to it will lower the output of the amp. So when in doubt always use a higher ohm. Unless you are very familiar with ohms and watts. By going lower you raise the output and risk overheating the amp and causing damage. KickerU is an app that will help match subs and amps by answering a few questions, it really takes the guesswork out of wiring and wattage related questions
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