# Active Ground
The Qudelix DAC/AMP product supports Qudelix's unique Active Ground output mode.
Active Ground Mode is a feature that converts BALANCED output to suit UNBALANCED input. It actively controls the ground terminal using an operational amplifier (OPAMP) to improve sound quality.
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Active Ground actively maintains the GND reference through the output of the OPAMP.
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Active Ground Control by OPAMP
| BALANCED output (2.5/4.4mm) | UNBALANCED input (3.5mm, RCA, AUX) |
| :-------------------------: | :--------------------------------: |
| L+ | L |
| L- | Common GND |
| R+ | R |
| R- | Common GND |
For the Active Ground Mode, the BALANCED output must be connected to the UNBALANCED input as shown above, and an adapter cable or gender adapter is required.
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**2.5/4.4 Male to 3.5 Female Adapter**
[**https://shorturl.at/cuvxD**](https://shorturl.at/cuvxD)
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Some earphones and headphones cannot be replaced with a full-balanced cable. In such cases, the Active Ground Mode can significantly improve sound quality. Additionally, using the Qudelix device as a preamp and connecting it to another amplifier's RCA or AUX IN can completely eliminate noise caused by ground loops.
