crossover design...

[theakstone]

Hi I am trying to understand the design of crossovers....few questions...

1/ how does a REAL crossover differ from a texbook design...ie what are the all the extra factors that are normally taken into account..eg time, diffraction, etc.

2/ what will the drivers roll off do to the crossover slopes? ie difference between electrical rollof, etc....(so when a design says...say 2nd order is that the physical bits themselves?)
ie I don't fully understand what target 4th order linwitz riley using 2nd order slopes means, and why in that case are the slopes on woofers and tweeters sometimes different....

ie woofer 2nd, tweeter 3rd,
or woofer 3rd, tweeter 2nd....

why sometimes steeper on woofers..


3/ what is the logical design sequence from scratch...

4/ what will the difference in baffle position do to the slopes?

any help much appreciated, thanks, Ian

[cstrahm]

Have you read the Tutorials? All of your questions are answered there.

[theakstone]

ask a stupid question, but where are the tutorials...I haven't bought the software yet as it is quite a committment...is it possible to have a preview of sorts, ie a manual or something?? at expense?

[cstrahm]

Oh. Well we generally do not put manuals up for public download. One reason is the size. The PDF files for the LEAP-5 four volume manual set is about 20MB. If people started downloading these in large volume we would pay a lot of money to our ISP for bandwidth consumption.

I can tell you that all of these issues are handled. Most of your questions are addressed by the fact that actual measured data is utilized for the crossover design. It is not a 'textbook' design. It is a simulation with real measured data of a prototype enclosure. To go into all of these details is simply not possible here in the forum.

Drivers are not flat. They have transfer functions themselves. A 4th order section response may be comprised of a 2nd order in the crossover and another 2nd order in the natural response of the driver. That is one reason why you must work with actual measurements for crossover design.