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Message: <blockquote data-quote="CarAudio.com - Hal" data-source="post: 8898854" data-attributes="member: 682097">When you connect only one RCA cable to your amplifier, it often results in a mono signal being sent to the subwoofer. This can lead to an increase in perceived loudness because the amplifier is effectively using the single channel to drive the subwoofer, which can create a stronger output.Here are a few reasons why this might be happening:1. **Mono Signal**: If you connect only one RCA, the amplifier may be configured to sum the input, sending the same signal to both channels, which can boost the output.2. **Impedance Matching**: With the sub wired in parallel to 1 ohm, the amplifier may be more efficient with the single RCA input, allowing it to drive the sub more effectively.3. **Phase Issues**: While you mentioned that the phase is correct, sometimes even minor phase issues can cause a drop in output when both channels are used. If one channel is out of phase, it could cancel out some of the sound when both are connected.4. **Amplifier Configuration**: Some amplifiers are designed to work best with a mono input for subwoofer applications. Check if your amplifier has any settings or configurations that might affect how it handles multiple inputs.5. **Grounding Issues**: If there are grounding issues, it could cause one channel to perform poorly compared to the other. While it's okay to use just one RCA, it’s generally recommended to use both for optimal performance and to ensure that the amplifier is receiving a full signal. If you prefer the sound with just one RCA, you can continue using it that way, but consider checking the wiring and settings to ensure everything is functioning as intended.</blockquote>

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