I'm confused... I tried your XO and I don't get the same results. It's either this (with woofer inverted):
Or this (with normal polarity):
I don't think the phase extraction was succesful in Xsim. If I choose "as measured" for the phase I get your results.
/Anton
Here are the frd and zma files I used, lets see if they are different from yours...
Edit... oops again! I had the phase "as measured"... switched to derived and yes, not as pretty anymore.
Sorry! I've had so many things on my mind lately, I have been drawing blanks more often than I would like!
Edit... oops again! I had the phase "as measured"... switched to derived and yes, not as pretty anymore.
Sorry! I've had so many things on my mind lately, I have been drawing blanks more often than I would like!
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Well, the two peaks from the woofer, at 2.75kHz and 4.65kHz are really bothering me.
We'll have to see real world measurements... I have found that TB likes to "doctor" their FR curves often... so, if those two peaks are really there, and even worse than they appear, then it shall be difficult to do anything about them.
We'll have to see real world measurements... I have found that TB likes to "doctor" their FR curves often... so, if those two peaks are really there, and even worse than they appear, then it shall be difficult to do anything about them.
I don't know about that. I've had good results using TB plots in simulations. One design I did measured extremely flat like the sim, and I used TB manufacturer plots to get there. Now, do they smooth and shrink the vertical scale? Of course they do! But when you carefully trace the curves, you come out okay.
Later,
Wolf
Later,
Wolf
I don't think TB doctor their curves, probably just taken nearer field than is practical and then published on a silly scale/resolution (1dB=1pixel?)
I've had a couple drivers from them where it shows a small 3-5dB dip on their graph, and in real life is closer to 10dBs or more.
Not talking about room nodes affecting the low end, more like dips that appears minuscule between 6kHz to 15kHz, that are chasms in real life.
Anyway, life goes on...
Not talking about room nodes affecting the low end, more like dips that appears minuscule between 6kHz to 15kHz, that are chasms in real life.
Anyway, life goes on...
I experimented a little with 2nd order (electrical) XOs around 2.5 kHz with normal and inverted polarity on the woofer.
With inverted polarity on woofer:
With normal polarity on woofer:
I prefer the one with inverted polarity on woofer (only first order electrical XO), better phase + less components + smaller inductor on woofer.
The one with normal polarity suppresses woofer breakup better and also protects tweeter better.
Both leave room for a baffle step around 400 Hz.
The resistors take some heat in both designs (more power than tweeter), but I guess that's fine.
/Anton
With inverted polarity on woofer:
With normal polarity on woofer:
I prefer the one with inverted polarity on woofer (only first order electrical XO), better phase + less components + smaller inductor on woofer.
The one with normal polarity suppresses woofer breakup better and also protects tweeter better.
Both leave room for a baffle step around 400 Hz.
The resistors take some heat in both designs (more power than tweeter), but I guess that's fine.
/Anton
That impedance curve's phase can't be right. At the LF peak, the phase should be about zero, just below that it should be positive, above that it should be negative. Something very wrong with your drivers' impedance curves' phase.
Hi Bill!
The impedance curve is from datasheet as I haven't recieved the drivers yet. I have never payed attention to the impedance phase, does it matter?
/Anton
Hi onni,
without phase data, it is not possible to design a correct crossover.
That's why I wrote that the published data are not correct. There is a need to measure.
without phase data, it is not possible to design a correct crossover.
That's why I wrote that the published data are not correct. There is a need to measure.
Me too. I don't want coax for a compact system, I want it, with minimal midrange excursion due to good woofer support, for a more conventional 3 way XO with highish tweeter XO point.
On 2 european sites it was listed as shipping from the 25th ie next week.
Prices listed for the 8" range from €190 to €260.
Prices listed for the 8" range from €190 to €260.
Dear All, I’m new here pls apologize.
Those drivers got my attention too and since are availble in Italy at 166€ 6.5 and 233€ 8, I’m interested to build a 2-3 ways with active crossover (minidsp).
Before start I’d like to know if any of you (more expert than me) managed to get the off axis reaponse and step response. I’d like to compare with latest Seas C18EN002/A - 6.5"
(More expensive and less full range).
Looking forward for your support
My Best
Lorenzo
Those drivers got my attention too and since are availble in Italy at 166€ 6.5 and 233€ 8, I’m interested to build a 2-3 ways with active crossover (minidsp).
Before start I’d like to know if any of you (more expert than me) managed to get the off axis reaponse and step response. I’d like to compare with latest Seas C18EN002/A - 6.5"
(More expensive and less full range).
Looking forward for your support
My Best
Lorenzo
Might be a good candidate for sealed with 8 or 10" subwoofers providing the grunty end.
