https://supportarchive.cambridgeaudio.com/hc/en-us/articles/24649152366621-Does-the-EVO-75-150-apply-a-high-pass-filter-to-speaker-outputs-when-a-subwoofer-is-connected-to-the-sub-out
No, the full frequency range is always sent to the speaker outputs, regardless of whether a subwoofer is connected to the sub out.
high pass filterevoapply