The S8.3 also features a fully variable phase control, adjustable to any value from -180 to 180 degrees, allowing the subwoofer to be fine-tuned to improve integration with speaker setups. In addition, this model also features a variable low pass filter, adjustable from 50Hz to 110Hz. A crossover filter switch allows for the variable low pass filter to be disabled for improved integration with a system which already includes bass management.
The main feature setting the S line apart from the rest of Energy's speakers is the inclusion of a forward-facing volume control for the speaker. The S8.3 has less power and somewhat less deep frequency response compared to the S10.3 and S12.3, but is also smaller and lighter.
