REL's instructions are pretty clear and straightforward to use and they are also accurate guidance with respect to optimal setup. I use mine near the corner of a half-wall, with the center line of the sub sitting at 45° with either side of the two walls.
With respect to the sub, the control that by far determines the bass output and the integration is the sub Gain setting, not the crossover (remember my DOE on my integration)
You can see this from the graphs below. The first plot is crossover (XO), the second is Gain (volume) and the third is the Gain/XO interaction.
You can see from the steepness of the line that its really the Gain (volume) that drives the 20 Hz response. Also, the p-value number shows that its statistically signficant as its less than a value of 0.05 (the industry standard value for significance at 95% confidence level)
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Lumin P1 streamer/DAC/preamp, Constellation Inspiration integrated TT: Michell Gyro SE MkII, SME V, Koetsu Urushi Vermilion, EAR324. Harbeth 30.2s, REL R-305, Shunyata Alpha V2 ICs, Alpha V2 SPs, Sigma XC, Sigma NRv2, Omega QR-s & Alpha NRv2 PCs, segmented Altaira SG stack w/ Alpha & Omega CGCs, Everest 8000 PD. Remote Server Room: Uptone EtherREGEN, AfterDark Master Clock & LPS, Alita, Battle Angel, (Akasa NUC Roon Core), iFi DC Purifiers (for SMPS used for Alita & router), Shunyata Gemini combo power distributor & Altaira-type CG GP-NR hub, Venom & Alpha CGCs, Shunyata NRv14 power cords for digital components.
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