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Old 26th October 2006, 09:52 PM   #1
qguy is offline qguy  Canada
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Default boosting frequencies from 45-65hz

newbie warning...

Is there a way to boost this frequency range by modding a passive 2 way crossover ?
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Old 26th October 2006, 10:03 PM   #2
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Not simply. What is your kit and what are you trying to achieve?
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Old 26th October 2006, 10:29 PM   #3
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here it is

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Old 26th October 2006, 10:30 PM   #4
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Old 26th October 2006, 10:31 PM   #5
qguy is offline qguy  Canada
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me too... hehehe

there... now its fixed
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Old 26th October 2006, 11:30 PM   #6
bjorno is offline bjorno  Sweden
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Hi gguy,

I think your Zobel, 2 Ohms and 12uf is missplaced and should instead be mounted over the driver + an - terminal.

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Old 27th October 2006, 01:20 AM   #7
bjorno is offline bjorno  Sweden
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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
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Old 27th October 2006, 01:21 AM   #8
bjorno is offline bjorno  Sweden
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Old 27th October 2006, 01:30 PM   #9
clem_o is offline clem_o  Philippines
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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...

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Old 27th October 2006, 02:01 PM   #10
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If this band is below the vent tuning frequency, forget it.
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