What Phase Should I Set My Subwoofer At? – HiFiReport
Regarding 'phase' setting on my REL subwoofer : r/audiophile
Phase Control | SVS Home Audio Glossary
REL phase 0 vs 180 | Audio Science Review (ASR) Forum
The structure inside a subwoofer's box must shift the phase of all frequencies by 180, or only the frequencies the subwoofer works with (the low ones)? - Quora