Hi, I have always preferred to have filters and eq's via dsp but I want to try a passive filter on this horn and c.d.
As I have never tried xsim before, I wanted to check with others. I have added a notch filter, a shelf filter and a 12db high pass filter in this order and the result seems promising. The high pass filter is there for protection mostly.
The horn has very even DI so all that I do will be reflected in off axis. So with this horn on axis response gives me a good enough foundation.
Loss of efficiency is no problem here. Please let me know if this is meaningful or crap!
As I have never tried xsim before, I wanted to check with others. I have added a notch filter, a shelf filter and a 12db high pass filter in this order and the result seems promising. The high pass filter is there for protection mostly.
The horn has very even DI so all that I do will be reflected in off axis. So with this horn on axis response gives me a good enough foundation.
Loss of efficiency is no problem here. Please let me know if this is meaningful or crap!
Meine Reihenfolge sieht am Beispiel eines Hochtöners eher so aus:
Hochpassfilter - passives Equalizing - Spannungsteiler zur Pegelanpassung. evtl. mit einer Kapazität parallel zum Serienwiderstand, um z.B. den Pegelabfall zu den Höhen hin von CD-Hörnern zu kompensieren.
Viele Grüße
Michael
Hochpassfilter - passives Equalizing - Spannungsteiler zur Pegelanpassung. evtl. mit einer Kapazität parallel zum Serienwiderstand, um z.B. den Pegelabfall zu den Höhen hin von CD-Hörnern zu kompensieren.
Viele Grüße
Michael
( post #2 translated: )
"My order looks more like this using the example of a tweeter:
High-pass filter - passive equalizing - voltage divider for level adjustment. possibly with a capacity parallel to the series resistance, e.g. to compensate for the level drop to the heights of CD horns.
Many greetings
Michael"
"My order looks more like this using the example of a tweeter:
High-pass filter - passive equalizing - voltage divider for level adjustment. possibly with a capacity parallel to the series resistance, e.g. to compensate for the level drop to the heights of CD horns.
Many greetings
Michael"
Here is the same with different values, but now impedance is better, the other one dipped around 2ohms, this is within 10ohms to 6 ohms. The response between about 900hz to 16khz is within -+1db and the lower knee looks good. I will match it with active bass with dsp so I don't think there would be a problem there.
Still, does this look ok to experienced passive crossover designers?
Still, does this look ok to experienced passive crossover designers?
The filtered system SPL response function seems to be good. It's nice and flat in the passband, and rising only by a few dB above about 14kHz. The lower frequencies below 1kHz are being rolled off quite smoothly and quickly. And the system impedance doesn't drop below 6 ohms in magnitude. These results look quite good.
I don't know where one should stop, I work on it more and get better results, within 0.75db for the same bandwidth above plus better lower knee behaviour. Impedance looks good too. I still wonder if I am missing something.
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I deliberately left the high frequency rise. It is also too high up, so mostly what people call "air". Also with the falling response of the off axis, the total room response would be flatter I guess
The bass is active and has dsp so no problem there. As long as the lower knee of this part is good, it will be easy to do.
Fo the notch filter I used how different do you suggest to implement it? By series, you mean CLR I guess. C on the positive and R on the negative line and L in between. I will model that on Monday as I am out and do not have access to PC at my work for the weekend.
In the meantime I will build this crossover and test it. I can later build one with series notch filter and test and compare that too.
I understand. I am just a bit curious about the height and extent of the high-frequency rise. From what I could see, it seemed quite mild in degree.
Here is one with 18db filter, followed by series and parallel notches. There is less loss of efficiency in this version I made, a little more deviation but within -+1db from 900hz to 16khz. The lower knee looks like I can work with it. The impedance does not dib below 5ohm too and is looks reasonably flat to me.
Here is the real life measurement taken at 1m and has a gating of 5ms (no room effects) the crossover at post #9
It is within 1db and this was a test crossover, the values are measured but it is a lot of stuff from the drawers to get the numbers right. So a better version may be even closer.
vs the xsim simulation of
It is within 1db and this was a test crossover, the values are measured but it is a lot of stuff from the drawers to get the numbers right. So a better version may be even closer.