Should I Connect Two Independent Subwoofer Outputs to the Same Subwoofer?

Connecting multiple audio sources to a single subwoofer can be tempting for those looking to maximize their audio experience, but it’s important to understand the potential risks and implications of such a setup. We strongly advise against connecting two independent subwoofer outputs to the same subwoofer. Here's why.

Different Signals and Corrections

When you connect two different subwoofer outputs to the same subwoofer, each output sends its own signal and correction profile. These signals are designed to optimize the audio performance based on individual parameters. Mixing these signals can lead to unpredictable audio performance and may cause the subwoofer to receive conflicting instructions. This can result in suboptimal sound quality and an imbalanced audio experience.

Voltage Concerns

Each subwoofer output carries its own voltage tailored to the specific signal it’s handling. Combining these voltages by connecting two outputs to one subwoofer can create an unstable electrical environment. This may not only degrade audio performance but also potentially harm the subwoofer's amplifier. While it is uncertain if this could cause permanent damage, it certainly doesn't contribute positively to the subwoofer's longevity or sound quality.

Risk of Overloading

Subwoofers are designed to handle a specific range of inputs. Feeding it multiple signals, especially if they are amplified, increases the risk of overloading the subwoofer’s amplifier. Overloading can lead to overheating and possibly frying the subwoofer’s internal components, especially if the volume levels are high. 

Conclusion

While the idea of connecting two independent subwoofer outputs to a single subwoofer might seem like a way to enhance your audio system, it poses several risks. Different signal corrections, voltage mismatches, and the potential for overloading the subwoofer’s amplifier are significant concerns. The best practice is to use a single XLR output from your AVR to the subwoofer's LFE (Low-Frequency Effects) port. Always prioritize the health of your audio components to enjoy a high-quality and long-lasting audio experience.