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The SPG555 features our patented-pending 3.5-inch RV C™ (Removable Voice Coil) allowing you to either change the impedance of the subwoofer or repair a defective voice coil; without having to remove the SPG555 from its enclosure! By removing six screws, you can simply slide out the RV C™ and replace it with a new one. In addition, the SPG555 features our SPS™ ( S o f t Part System) allowing the user to replace the entire cone/surround/spider assembly should they ever become damaged. The SPG555 i