The Crossover in a REL is a tuneable electronic circuit that filters out frequencies above where the Sub Bass System works. These higher frequencies are not useful to provide the foundation of very low frequencies that the REL is working at. This circuit is tunable so the adjusting the crossover will let the REL seamlessly integrate into the system and room.
REL controls have detents you can feel when rotating them. We refer to these as clicks and use them to guide positions of these controls.
In our experience, it is best to start the Crossover control at 15 clicks from the minimum setting. For a majority of systems, the final set point for the crossover will be within + or – 3 clicks of this starting point.
If you are finding that you need to set the Crossover control to be above 20 clicks, then your main speakers may not be making very much low bass. Or there is likely problem with your setup.
The REL could be:
- Out of phase with the main speakers so together they are cancelling the sub bass frequencies.
- Not in the optimum place so that it is not effectively pressurizing the room.
- There is a problem with the input connection so there is not enough input signal to get amplified.