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-   -   boosting frequencies from 45-65hz (http://www.diyaudio.com/forums/multi-way/89100-boosting-frequencies-45-65hz.html)

qguy 26th October 2006 10:52 PM

boosting frequencies from 45-65hz
 
newbie warning...

Is there a way to boost this frequency range by modding a passive 2 way crossover ?

pinkmouse 26th October 2006 11:03 PM

Not simply. What is your kit and what are you trying to achieve?

qguy 26th October 2006 11:29 PM

here it is

http://i70.photobucket.com/albums/i1...psis/xover.gif

Cal Weldon 26th October 2006 11:30 PM

Link doesn't work for me.

qguy 26th October 2006 11:31 PM

me too... hehehe

there... now its fixed

bjorno 27th October 2006 12:30 AM

Hi gguy,

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

B

bjorno 27th October 2006 02:20 AM

2 Attachment(s)
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

bjorno 27th October 2006 02:21 AM

2 Attachment(s)
pic2

clem_o 27th October 2006 02:30 PM

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

richie00boy 27th October 2006 03:01 PM

If this band is below the vent tuning frequency, forget it.


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