Starting from a very low crossover setting, around 25 Hz and moving up until finding a desirable level makes a lot of sense. In fact that is exactely what REL manual suggests. However, REL distributor clearly states that:
In reply to:
in my experience, the REL is crossed-over around 25 Hz the overwhelming majority of the time when used with floorstanding speakers.
That is the part that I don't understand. I tried it yesterday at around 25: you could hear the sub when increasing the high-level volume knob all the way up. However it sounded a little weird, and kind of out of phase. I'll give a few more hours (days) at that setting.
