since a couple of years, i've owned a pair of Summits (not X). Right from the beginning, I was not really happy with bass performance. Although the Summits are known for excellent and deep Bass, there is only very weak bass in my setup. I've heard Summits several times at other places, and compared with mine, lower frequencies were excellent, almost too much.
As I was used to weak bass with my CLS too, I thought, this might be caused by my room, which is not optimal for sure.
But now: accidentally I may have set the 25Hz Knob to -10 dB at one Speaker - and there it was. Enourmous and heavy Sub-Bass ! So, I did several Tests with Test Signals and it turned out, that every time I increase volume of one Woofer, bass disappears.
It seems to me, as if one of the woofers is not in phase. Is there anything I could inspect by myself? Maybe just the internal wiring is reversed. Are the inside connections accessible somehow?
Many thx for your Input,