Sub best at high crossover?

Dbphd - I fail to see what is silly about asking about other users' experiences, or what this has to do with magical thinking. As others here have commented, there are often several ways to do it, much depends on the room, etc. And do you find it totally impossible that the equalizer has a negative effect?

OK folks, I am back in the fold. That is, I've changed speakers, I now have bipoles that go lower down in frequency, and have found that the sub now sounds best with the crossover at 40 hz or so. There is a plus and a minus, and what is most important varies with the situation.

Hello Holter.

I'm experimenting with sub placement and settings myself, coming from one REL Storm III and now running two very heavy DIY 12" Rythmik subs that sport many setup controls, and I also use a measurement mic, REW software and an external board.

Lately I'm experimenting with Dr Earl Geddes approach for setting up multiple subs (you can google it typing in that phrase), and I'm very happy with the results so far. This appproach calls for yhe use of at least two subs, one of which runs purposedly in overlap with the mains. I let mine go up to 110 Hz and limit the lower extension. The other sub takes care of the lowest frequencies. The final goal of Geddes approach is to achieve a smooth room frequency response, and while I'm far from done yet, I see it's working.

Worth reading, in my opinion. And the measuring equipment is sooo helpful to make decisions quickly, to later listen and decide with your ears.

Thanks for interesting info, Lewinskih01. I had two RELs once but never tried the setup you describe. Perhaps others here have experience?

An update from me.
I am back to a conventional setup, the sub closer to the wall, crossover at 50 or so, with my new full range Audiokinesis speakers. It sounds best at phase 90.
Although in some contexts the Velodyne DD18 sounds best on low volume with no crossover and no EQ, this seems to be quite special contexts. In my case, to get the timing and depth added value (more than the bass effect as such), it worked best with the sub front a foot or so in front of the speakers. This was not very practical in our combined living / listening room, however.
My purpose with this thread is only learning - all options should be considered. The DD18 is a good sub, able to contribute in different ways.