Carefully reread Magnepan's recommendation that PEH posted above.
Quite often (and, yes, it does depend upon the subwoofer in question) even when calibrated perfectly properly, a subwoofer will NOT reproduce the upper bass region appropriately. This problem can actually be MORE apparent with a more capable subwoofer. This is the "hole" they are referring to. They are not referring to a hole caused by too low a "global" crossover setting being utilized.
Right it could be interpreted as well, but once again they would throw a blanket statement on every subwoofer, and again this problem exitsts, because they center speakers can't reproduce any bass below 100-150hz depending on the model.
Even though we think that the digital crossovers available in processors are nifty and work perfectly, they are actually quite rigid. An 80Hz crossover setting, for example, utilizes an 80Hz HP and LP filter and this sort of rigid crossover (where the HP and LP point are identical) requires specific filter slopes in order for it to work properly.
THX certified processors are required to have 2nd order slope for HP and 4 th order for LP. Digital crossover are far more precise and don't introduce phase alterations like those in speakers and subwoofers that use analog type filters.
A subwoofer's variable low-pass filter often utilizes a more ideal slope and, more importantly, allows for a sliding LP relative to the fixed natural HP of a LARGE speaker.
Most subwoofer don't have built in HP filters, and the ones often use are just single XO point that maybe too high for the mains like the OP is planning to use. Their slope on the LP is usually is 4th order same as most receiver use these days THX or not.
You might think that multiple crossover points is a bonus, but many consider it a Pandora's box.
First of all it's not just me against the many as you put it, there are many also who thinks that better and multiple crossover setting can be
a good thing, but I laso think that it could
create more problems indeed though it depends on many variables.
This is not a Dolby requirement. The vast majority of processors simply direct rerouted bass to the subwoofer channel. Yes, there ARE some processors that will direct some or all of the redirected bass to the LARGE front channels. But (and correct me if I am wrong) what you are proposing is running the front channels as SMALL, too, in which case, there IS NO possibility that any redirected bass is routed to the front speakers. So that's a moot point, no?
Consider yourself corrected. The ability to set the subwoofer to no is a requirement of any bass management system which Dolby pretty much wrote, though they don't require it per se, but THX does. That's all I was refering to since that's what Magnepan want's you to do as step one.
I don't have to know what it can do. I am assuming it is the best thing since sliced bread; that it can wipe my butt and cook dinner, too. Not that it is crippled in any way shape or form.
It's too bad you had resorted to this..........
what a shame.