distance between drive units question

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I noticed that some speaker designs such as Thiel sometimes have their bass units placed some distance away from the mid (altho maybe the baffle is curved for time alignment?)

I was wondering if there is a critical frequency cut- off for this-
i.e. at which mid to bass frequency point ( distance between bass and mid on the baffle) stop becoming placement critical?:confused:
 
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Hi,

It depends on the x/o frequency as to how much lobing you
will get if you separate bass and midrange by some distance.

Typically its done due to floor dip. Lowering the bass units lifts the
floor dip frequency, the idea being to move the dips apart for both
drivers and then x/o inbetween so the dips are nullified.

rgds, sreten.
 
Thanks for explaining, I kind of understand altho at the same time slightly went over my head. :)

Also the Kef Blade has a quite a high x/o of 350 hz (between the forward firing co axial and side firing bass units) so I'm guessing they implemented something like this.
 
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Hi,

It depends on the x/o frequency as to how much lobing you
will get if you separate bass and midrange by some distance.

Typically its done due to floor dip. Lowering the bass units lifts the
floor dip frequency, the idea being to move the dips apart for both
drivers and then x/o inbetween so the dips are nullified.

rgds, sreten.
I will probably have to separate my MF and LF drivers. Where do I find the info for the dip freqencies? My xover is active, and the bass cabs can be reversed, so I can alter things to suit.
 
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