I found this to be really elegant in its simplicity. I've attached the image of and the .dxo as a zipped file. He used it in a series xover on the former Epique 5.25" in a large 3way.
Hi, thanks.
What does the T filter formed by L3,C3 and L4, please ?
is it named "compensated low pass" ?
What does the T filter formed by L3,C3 and L4, please ?
is it named "compensated low pass" ?
L4 is deactivated, right?
That's the reason for impedance decreasing to zero at high frequencies.
What value would you suggest for L4 and R1?
That's the reason for impedance decreasing to zero at high frequencies.
What value would you suggest for L4 and R1?
Yes, I did that to show it as it was originally drawn. The added resistance would negate the short, as well as the coil ramping up impedance.
To another eye, it maybe doesn't look so novel, but the way this is shown looks like double notches.
To another eye, it maybe doesn't look so novel, but the way this is shown looks like double notches.
L4 could be replaced with a resistor too to fix that issue. In the Series Xover as JML posted, there was a series resistance before the split, but it was outside the basic circuit of what I posted above.
The circuit as drawn above may look more complicated than it is but it's simply a second order high pass and 3rd order low pass (including L4).. and then a bandstop filter across the driver.
This notch filter sets the low pass slope which in this case is quite steep. Phase may not agree with a more conventional slope of this steepness due to the out of band differences.
This notch filter sets the low pass slope which in this case is quite steep. Phase may not agree with a more conventional slope of this steepness due to the out of band differences.
https://purifi-audio.com/blog/app-notes-2/low-distortion-filter-for-ptt6-5x04-naa-11
Series vs parallel notch approaches and benefits with series. May or may not be beneficial with the epique driver
Series vs parallel notch approaches and benefits with series. May or may not be beneficial with the epique driver
Someone else pointed out elsewhere that redrawn this is as Allen stated.
And there is difference to the Purifi methods because a series notch has the components in series placed in shunt and a parallel notch are in parallel placed in series with driver. This is confusing many a builder.
And there is difference to the Purifi methods because a series notch has the components in series placed in shunt and a parallel notch are in parallel placed in series with driver. This is confusing many a builder.