boosting frequencies from 45-65hz

qguy · 26th October 2006, 09:52 PM

newbie warning...

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

pinkmouse · 26th October 2006, 10:03 PM

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

qguy · 26th October 2006, 10:29 PM

here it is

Cal Weldon · 26th October 2006, 10:30 PM

Link doesn't work for me.

qguy · 26th October 2006, 10:31 PM

me too... hehehe

there... now its fixed

bjorno · 26th October 2006, 11:30 PM

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, 01:20 AM

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, 01:21 AM

pic2

clem_o · 27th October 2006, 01:30 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, 02:01 PM

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

26th October 2006, 09:52 PM	#1
qguy diyAudio Member Join Date: Mar 2005 Location: Burnaby	boosting frequencies from 45-65hz newbie warning... Is there a way to boost this frequency range by modding a passive 2 way crossover ? __________________ na

26th October 2006, 10:03 PM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Not simply. What is your kit and what are you trying to achieve? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

26th October 2006, 10:29 PM	#3
qguy diyAudio Member Join Date: Mar 2005 Location: Burnaby	here it is __________________ na

26th October 2006, 10:30 PM	#4
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Link doesn't work for me. __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

26th October 2006, 10:31 PM	#5
qguy diyAudio Member Join Date: Mar 2005 Location: Burnaby	me too... hehehe there... now its fixed __________________ na


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26th October 2006, 11:30 PM	#6
bjorno diyAudio Member Join Date: Mar 2005 Location: Jacobsmountain	Hi gguy, I think your Zobel, 2 Ohms and 12uf is missplaced and should instead be mounted over the driver + an - terminal. B

27th October 2006, 01:30 PM	#9
clem_o diyAudio Member Join Date: Jun 2005 Location: Manila	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

27th October 2006, 02:01 PM	#10
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	If this band is below the vent tuning frequency, forget it. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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