Passive filter with odd values. Why? - Page 2

Radioman62 · 16th February 2010, 09:34 PM

Panomaniac
What software are you using?

PeteMcK · 16th February 2010, 10:23 PM

re:'I have allready measured the values of the elements' -
sorry, didn't make it clear, but you need to measure the drivers you're using, an impedance curve. Then you'll know what impedance values to plug into your calculator

Pano · 17th February 2010, 12:00 AM

That's the "Passive Crossover Designer" from the FRD Consortium. It runs in MS Excel. I love it. Free, too.

Passive Crossover Designer

Radioman62 · 17th February 2010, 10:54 AM

Thank you panomaniac!

That was an amasing spreadsheet. Together with the Unibox spreadsheet, where I export my impedance curves to be imported to this "Passive Crossover Designer", I can see what I have now and what I need to do.

My old filters can really need some adjustments

It's also great to be able to test different "what if" scenarios.
It's almost a pity I have decided to go with active filtering later on. I may go halfway though. Bi amping with a passive filter for the mid and tweeter.
Anyway, knowledge doesn't hurt, does it?

Pano · 17th February 2010, 01:06 PM

You're welcome! The spreadsheet is a great tool. Just playing around with it will teach you a lot about how crossovers work.

If you can get the impedance curves of your drivers, you should plug them into the sheet. That allow you to see what the filter is really doing. It does not tell you the real frequency response, but it gets you closer.

Radioman62 · 17th February 2010, 03:56 PM

Hi
I have now found the spreadsheet "Response modeler" from the same author.

Awesome! Seems to be all I need for armchair designing

Radioman62 · 17th February 2010, 05:04 PM

At first I thought I had it all.

Now I see Í have problem with the spreadsheets. I can't save any setup. I can't load any of the examples in PCD without errors. I get errors 13 and 1004 All seems related to mid range driver calculations.

I'm running Office 2007 with all upgrades Win XP and SP3.

Ohh if something could be easy and fun all the way

************* time goes by ... *********

Just before I pushed the submit button on this reply, I gave my old Excel 2003 a chance. Installed beside my 2007 installation.
Now it seems to work.

Why isn't Office backward compatible? This is a PITA

Hope someone else can get use of my findings.

Pano · 17th February 2010, 05:40 PM

Good to know. Guess I'll stick with my Excel 2003!

jerome69 · 05:50 PM

There is an excel 2007 version, better to see below

jbagby

Radioman62 · 17th February 2010, 06:58 PM

Thanks jerome69
This seems to be the umbrella for all those good softwares.

Anyone been in contact with this genious Jeff Bagby?

16th February 2010, 09:34 PM	#11
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	What softwrae Panomaniac What software are you using? __________________ Cheers// Ove

16th February 2010, 10:23 PM	#12
PeteMcK diyAudio Member Join Date: Feb 2002 Location: Western Sydney	re:'I have allready measured the values of the elements' - sorry, didn't make it clear, but you need to measure the drivers you're using, an impedance curve. Then you'll know what impedance values to plug into your calculator __________________ Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency

17th February 2010, 12:00 AM	#13
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	That's the "Passive Crossover Designer" from the FRD Consortium. It runs in MS Excel. I love it. Free, too. Passive Crossover Designer __________________ Take the Speaker Voltage Test!

17th February 2010, 10:54 AM	#14
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	I got the tools now Thank you panomaniac! That was an amasing spreadsheet. Together with the Unibox spreadsheet, where I export my impedance curves to be imported to this "Passive Crossover Designer", I can see what I have now and what I need to do. My old filters can really need some adjustments It's also great to be able to test different "what if" scenarios. It's almost a pity I have decided to go with active filtering later on. I may go halfway though. Bi amping with a passive filter for the mid and tweeter. Anyway, knowledge doesn't hurt, does it? __________________ Cheers// Ove

17th February 2010, 01:06 PM	#15
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	You're welcome! The spreadsheet is a great tool. Just playing around with it will teach you a lot about how crossovers work. If you can get the impedance curves of your drivers, you should plug them into the sheet. That allow you to see what the filter is really doing. It does not tell you the real frequency response, but it gets you closer. __________________ Take the Speaker Voltage Test!


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17th February 2010, 03:56 PM	#16
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	Hi I have now found the spreadsheet "Response modeler" from the same author. Awesome! Seems to be all I need for armchair designing __________________ Cheers// Ove

17th February 2010, 05:04 PM	#17
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	At first I thought I had it all. Now I see Í have problem with the spreadsheets. I can't save any setup. I can't load any of the examples in PCD without errors. I get errors 13 and 1004 All seems related to mid range driver calculations. I'm running Office 2007 with all upgrades Win XP and SP3. Ohh if something could be easy and fun all the way *********** time goes by ... ***** Just before I pushed the submit button on this reply, I gave my old Excel 2003 a chance. Installed beside my 2007 installation. Now it seems to work. Why** isn't Office backward compatible? This is a PITA Hope someone else can get use of my findings. __________________ Cheers// Ove

17th February 2010, 05:40 PM	#18
Pano diyAudio Moderator Join Date: Oct 2004 Location: North Carolina Blog Entries: 4	Good to know. Guess I'll stick with my Excel 2003!

17th February 2010, 05:48 PM	#19
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	There is an excel 2007 version, better to see below jbagby Last edited by jerome69; 17th February 2010 at 05:50 PM.

17th February 2010, 06:58 PM	#20
Radioman62 diyAudio Member Join Date: Mar 2005 Location: Near Gothenburg, the westcoast of Sweden	This is the ultimate passive filter page? Thanks jerome69 This seems to be the umbrella for all those good softwares. Anyone been in contact with this genious Jeff Bagby? __________________ Cheers// Ove

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