Hi qguy,
I must explain why I first thought the vertical branch of your filter is a misplaced Zobel.
Looking at your R,C, L branch, I found a low Q and a center frequency of 1125 Hz that is
very close and is strongly interacting with the other components, so I tested with two
different loads to se what happened with the amplitude and the phase.
Then I moved the 2-Ohm resistor and the capacitor and placed the component as a Zobel.
For both loads the plots look much better, but I could be mistaken and your filter is in reality
a filter with a slope about 4.5 dB/octave and not a close to 18 dB/octave as it looks like?
Take a look at my plots :
B
I must explain why I first thought the vertical branch of your filter is a misplaced Zobel.
Looking at your R,C, L branch, I found a low Q and a center frequency of 1125 Hz that is
very close and is strongly interacting with the other components, so I tested with two
different loads to se what happened with the amplitude and the phase.
Then I moved the 2-Ohm resistor and the capacitor and placed the component as a Zobel.
For both loads the plots look much better, but I could be mistaken and your filter is in reality
a filter with a slope about 4.5 dB/octave and not a close to 18 dB/octave as it looks like?
Take a look at my plots :
B
Attachments
bjorno,
Perhaps the filter response is what the driver actually needs. We don't have info on what the xo is driving... for example, it may be a way to extend the frequency response of the LF unit just a bit so that the HF driver can be crossed just a bit higher in frequency...
qguy,
I've seen KEF use a coupling capacitor into the LF unit to "hump" the response just a tad. The coupling capacitor also reduces extreme LF response so that boosting (via bass control on the amp) allows for a bit more subjective 'oomph' without bottoming out the LF driver...
Cheers
Perhaps the filter response is what the driver actually needs. We don't have info on what the xo is driving... for example, it may be a way to extend the frequency response of the LF unit just a bit so that the HF driver can be crossed just a bit higher in frequency...
qguy,
I've seen KEF use a coupling capacitor into the LF unit to "hump" the response just a tad. The coupling capacitor also reduces extreme LF response so that boosting (via bass control on the amp) allows for a bit more subjective 'oomph' without bottoming out the LF driver...
Cheers
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