where do you cross over your ht setup

I have come to the conclusion that SW/Main crossover should be set based on what your particular SW can do rather than what your Mains can do. Any decent Main speaker ought to get down to 40 Hz or so, but doing so may adversely affect the Mid bass range, 70Hz up to about 200 Hz. Give the Mains a break, and set the X/O to 80-100 Hz. Try it that way first. If you don't think the SW can hack it, then go lower.

Vedric...Take off the grill and look at what your woofer is doing while it reproduces 20 Hz (or even 30 Hz). Do you want that going on while it is trying to reproduce the critical 80-800 Hz range? Same goes for the power amp.

Vedric...I read your earlier post. Sorry, but I believe that a 25Hz crossover (mains) is just about the same as no crossover. 35 Hz (center) and 40 Hz rears barely qualify as a X/O (IMHO). Remember that no crossover is a complete cutoff, and there is significant signal below the nominal X/O frequency.

You argue that LF capability of the mains should not be "wasted". OK. Why waste the HF capability of your SW?(if you can call 80 Hz HF). If your SW can't run up to 150 Hz or so without difficulty you need a different SW.

I guess no one can answer this one.

Question to you...Why do you think that a cone driver mounted in the main enclosure is superior to a similar (perhaps identical) cone driver mounted in a different box?
Six of one: half a dozen of the other.

Well regarded subwoofers are described as "fast". Surely that is the same thing as saying that they are capable of relatively high frequency reproduction. The subwoofer system that I built includes 15" JBL drivers that were used as woofers in their speaker systems crossed over at 800 Hz. Obviously 80 or 90 Hz is no problem.

Vedric...Agreed that LF from a SW has directional aspects which should be preserved. (Unless you are playing an LP where the LF has already been mixed to mono). I think that every speaker should have its own SW: at least 2, and I have 3. However, I thought that this post was about crossover frequency.

Distortion...Every crossover except 6 dB/octive is a cascade of several filters. The common 24dB/octive slope used with electronic crossovers is four stages. Guess how you make a 48 dB/octive X/O.

There is nothing evil about "stacking" two crossovers, however the very steep crossover may not be desirable, and if the two X/O are set to different frequencies things could get messy.

Vedric...I have cited my reason for a "high" (80-90 Hz)crossover...(to keep the LF that requires large cone excursions out of the mains so that they can better reproduce the rest of the sound). You have recommended 25-35 Hz, suggesting that there is directional information down there. (OK, but that argument does not apply if multiple SW are used).

Question to you...Why do you think that a cone driver mounted in the main enclosure is superior to a similar (perhaps identical) cone driver mounted in a different box?
Six of one: half a dozen of the other.

In my case, where the mains are planar MG1.6, there might be an argument that spatial effects would be different if the higher range of LF eminates from the SW. I have addressed this issue by building three multi driver SW systems into the wall behind the three MG 1.6, so that the SWs "play through" the screens. Believe me, 80-90 Hz works best, even though the MG1.6 measures flat in my room to about 40 Hz.

Vedric...I normally don't use the LFE channel to drive my subs. If and when I get into movies I can switch the center SW to use the LFE signal.