Subwoofer input impedance refers to the electrical resistance the subwoofer presents to the signal coming from your AV receiver or preamp. It’s measured in ohms (Ω) and typically falls in the range of 10kΩ to 50kΩ for line-level (RCA or XLR) inputs.
Why It Matters:
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Compatibility: High input impedance ensures that your subwoofer doesn’t place a heavy load on the signal source (e.g., AVR subwoofer output). This prevents signal degradation and helps maintain audio quality.
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No Need to Match Ohms: Unlike speaker output impedance (which can require more careful matching to the amplifier), input impedance on a subwoofer doesn’t need to match the output impedance of your AVR. Most modern gear is designed to be fully compatible.
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Multiple Subwoofers: If you’re daisy-chaining subwoofers (e.g., via XLR loop-out), high input impedance prevents cumulative loading on the AVR, making it easier to run multiple subs without overloading the source.
In Practice:
If a subwoofer has, say, 20kΩ input impedance, that means it’s easy for most AVRs to drive the signal to it without affecting voltage or current. You don’t need to worry about this value when setting up your system, it’s more of a background spec that ensures proper electrical behavior.
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