offsetting, rounding edges, driver placement

[tech.knockout]

some people say you should:

2. Round the baffle edges
3. Offset the tweeter/midrange so that the distances from the dges are different.

Now I see lots of speakers that dont obey these rules at all.

Can somone explain this?

and then theres this rule about distance between the drivers must be a fraction of the wavelength of the Xover frequency

[coolkhoa]

These are not as much "rules" as they are just things to consider to make a better sounding speaker. Some designs need such features more than others, and some won't sound very good if they're not implemented. Most designs benefit from baffle edge-rounding, and I recommend using the largest-radius bit you can get. Offset tweeters/midranges are a less common feature but can be beneficial in some designs. But personally, I like my speakers symmetrical...

[tech.knockout]

Most designs benefit from baffle edge-rounding

Many high end designs dont do baffle rounding.

E.g. Dynaudio and Proac. Even the highly popular Proac response DIY project.

personally I like the look of having sharp edges. The speakers look more imposing.

[Guss]

Svante brought us ''the edge'', have a look at his website.