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RE: Passive, Active and EQ

B_ATL: "Cleanest?"

LOL! To be sure, it is tricky...but yes if the PLLXO is custom designed for a given set of hardware and with quality parts...and only for the proper application. Unfortunatly, the right combination of hardware, speakers and skills/knowledge does not happen all that often.

Luckily, many Maggies prefer the shallow slopes that a PLLXO can do well...but that's just a part of it.

In addition, I have to say that some kind of measuring capability is needed to fully calibrate. Anyone who tries a PLLXO simply on the basis of the theoretical component behavior will miss some of its great potential. As an example, careful selection and matching of the caps and resistors will make a huge difference compared to other sets of similarly rated quality parts.

I can relate to your reservations about the impedance. I had them at first. A bit of luck helped me in that the equipment I have already allows for lower impedance matches. I can run the mid/bass panel in 1st or 2nd order. The higher impedance imposed by 2nd order in my case (<5k ohms for 1st vs <53k ohms for 2nd) causes a 6db signal loss...but no loss of clarity that I can perceive.

In general, one can go and throw some numbers relative to the interface specs, and typically wind up with a PLLXO bi-amp that can be clearly superior to a speaker-level xover but miss the mark against a good ALLXO.

Or, one can go further by choosing, matching and measuring behaviors, and further refining accordingly. Then one winds up with something that can't be beat...but it is a lot of work and it is not for everyone.

Still, thank heavens for the good ALLXOs. They maintain signal strength. They can do sharp slopes when needed and allow for multi-drivers much more easily. Some can even do quite nifty digital tricks for those who don't mind extra digital steps. Furthermore, ALLXOs can do most of this without a care for what they are hooked into (my PLLXO will easily need a redesign if I change some components).

ALLXO can do all this in manners that are more practical for most everyone...and do it superbly.

However, the parts count...count. If one can get away with a proper PLLXO implementation, this shows.






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  • RE: Passive, Active and EQ - JBen 11:18:29 03/16/12 (0)

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