Originally Posted by tuxedocivic
Yes, thank you for answering. So I'm measuring free space and you are measuring the baffle step.
One more time: If the source isn't radiating omni-directionally it's not free-space. Free-space refers to what you're measuring, not where you're measuring it.
What is referred to as baffle step... is where the frequencies in the lower regions stop being omni-directional
You have it backwards. It's where the higher frequencies become fully directional when the baffle is one wavelength in dimension.
From reading those links that Bill posted up, it says that the high frequency drivers should not be mounted directly in the middle of the enclosure, no matter how high up it is, it should always be staggered....is this correct?
The idea of staggering is that it smooths the baffle step transition by having the step take place at different frequencies on either side of the baffle. Perhaps, but IME it doesn't make that much of a difference.
Also, shouldn't the woofer, mid-range driver and, tweeter all be located as close to each other as possible?
Yes, to minimize response lobing,
Is it generally a bad idea to pad down the tweeter in a crossover in order to match the SPL in the woofer due to the diffraction less or baffle step? Would it not be better to add some attenuation to the woofer to match the tweeter?
The tweeter can't be louder than the woofer and the woofer louder than the tweeter at the same time. Padding down and attenuation is the same thing.
In any event I don't believe in padding anything, all that does is to unnecessarily burn off power as heat. The entire notion of flat response out of the box is intrinsically flawed, because when you put a perfectly flat speaker in a room it's not flat anymore. You must use EQ to get flat in-room response, so passively correcting anything other than a gross mis-match of components, which indicates a basic design flaw anyway, is a waste of parts.