cross over frequency

Thread Starter

ninjaman

Joined May 18, 2013
341
hello

the cross over frequency. it usually has a -3dB drop. what are the problems if it doesn't have a -3dB drop
the circuit is a third order butterworth for both low and high pass.
I know that if the two signals are in phase then the phases add meaning there is a peak. but im not sure how to best word this. and what the consequences are

if any could help I would appreciate it

thanks
simon
 

tubeguy

Joined Nov 3, 2012
1,157
hello

the cross over frequency. it usually has a -3dB drop. what are the problems if it doesn't have a -3dB drop
the circuit is a third order butterworth for both low and high pass.
I know that if the two signals are in phase then the phases add meaning there is a peak. but im not sure how to best word this. and what the consequences are

if any could help I would appreciate it

thanks
simon
The crossover point may be considered to be at the -3db point.
Are you thinking of the slope of the filter?
3rd order filters just have a steeper slope, than a first or second order filter.
The -3db point is still the -3db point.

For a speaker crossover some think out of phase at the crossover point is preferred. And sometimes it's useful to have different Hi-pass and Lo-pass crossover points to deal with uneven speaker frequency response.
A steeper slope, especially on a speaker Hi-pass is sometimes beneficial to keep excessive low frequency energy out of a HF driver (tweeter)
 
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