Sub best at high crossover?

Vicdamone, IIRC it used to be common practice to use the 3 dB down point when quoting frequency response limits. But that may no longer be the practice and it may never have been universal. Frequency response tends to drop like a rock below the 3 db down point.

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Dbphd, that's my experience. Even if a speaker system actually measures reasonable output at 25Hz the room usually requires gain in that region.

I've gone round and round with some folks on Bass forums regarding their electric Bass cabinets which generally begin rolling off at 40-50Hz. While low E is about 41Hz there are fundamental overtones that reach well below and even further from a Double Bass.

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.