Zobel with 3rd order crossover

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
Zobels and 3rd order crossover???

when using a zobel calculator I was given 14uf and 8ohms for my driver, however this is for use with a 3rd order crossover and will essentially be put in parrallel with a 4uf and 2ohm.

Does this need to be taken into consideration?

Should I run a 10uf instead of the 14?

Is there a formula?

Also is there a calculator for a zobel using an inductor to take the low range impedance hump out? I'd also like to experiment with that while I'm currently running wires out of my ports.

Thank you
 
I tried using two different software and ended up frustrated, one was eminence software which is very limiting when free, stumbled across that when I was looking for specific files from eminence to run in another program that needed them (forgot the name, I think it was an independent software). couldn't get either to work for me.

Can you recommend one?
 
Moderator
Joined 2008
Paid Member
The impedance rise compensation that you are using can stay as it is. Apply the third order filter regardless. If you were measuring or simulating you could afford to consolidate and minimise the component count. It is difficult to calculate and otherwise not recommended to guess.

About the impedance resonance peak filter, yes that can be done but you may not need to.
 
Just another Moderator
Joined 2003
Paid Member
The best zma and frd files are the ones you measure yourself, with the driver in your actual cabinet :)

Impedance is quite easy to measure. You only need a cable, a resistor and a full duplex sound card with line out and line in. software such as ARTA, REW, AudioTester or speaker workshop can then be used to measure the impedance. I used to use speakerworkshop but found with light cones it doesn't seem to get it right, so now use REW.

http://www.claudionegro.com/sw/swsetup/cables/cables.html

FRD requires a bit more, in that you should have a calibrated microphone, and potentially a microphone preamplifier. REW, ARTA or Holm Impulse can all do frd measurements.

I find speaker-workshop great for simulating crossovers, and it has an auto zobel calculation.

Tony.
 
Moderator
Joined 2008
Paid Member
I find speaker-workshop great for simulating crossovers,
So do I. Other than that I only use it for displaying, operating on and combining charts. I still need to export everything to display polar charts, and I still need to do my own power and D.I. calculations. I don't use any of the automatic functions or measurement tools. Still, it accounts for many lost hours.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.