ELAC SUB 2090 Operating Instructions Manual page 29

High-End Audio Components
Symmetrical connection (stereo XLR)
This type of connection is used to connect High-End audio components which offer the appropriate outputs to the subwoofer.
If your source provides symmetrical outputs (XLR) this kind of connection should be preferrably used as it offers the best audio
quality.
The "CUTOFF FREQUENCY" must be adjusted to suit the main loudspeakers.
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