I just started using xsim v 1.2.00 and have made a simple circuit of one woofer (with its .frd and .zma files loaded) and I added a simple parallel notch filter just to get acquainted. My plan was to change the values of the filter to see the changes in the response curve.
But the curve did not change when I made changes in the component values.
What am I missing?
But the curve did not change when I made changes in the component values.
What am I missing?
What Bill ( the author of XSim ) calls a parallel notch filter many ( including myself ) call a series notch filter .
This sort of filter ( paralleled across the driver ) needs resistance between it and the voltage source ( amplifier ), before it will give any attenuation.
If there's no inline resistance, then this LCR simply becomes a frequency-dependent impedance modifier.
Stick a 10 ohm resistor right after XSims voltage generator, before your LCR filter > then the LCR will start acting as a notch filter.
🙂
This sort of filter ( paralleled across the driver ) needs resistance between it and the voltage source ( amplifier ), before it will give any attenuation.
If there's no inline resistance, then this LCR simply becomes a frequency-dependent impedance modifier.
Stick a 10 ohm resistor right after XSims voltage generator, before your LCR filter > then the LCR will start acting as a notch filter.
🙂
Thanks for your reply,
In my attempt to learn how to use this program I entered values for my crossover and drivers into the program to attempt to make adjustments to the crossovers for new mid and tweeters in my 3 way towers. When the curves did not respond to the changes I went to
Audio peak filter circuit - with practical example | Audio Judgement
and tried to follow his example just to see if by starting simple I could make the curves change by changing values of the resistor in the notch filter as the author suggested. No joy. Then I just followed your advice and still no change in the curves.
I've got to be doing something wrong. But I can't figure it.
In my attempt to learn how to use this program I entered values for my crossover and drivers into the program to attempt to make adjustments to the crossovers for new mid and tweeters in my 3 way towers. When the curves did not respond to the changes I went to
Audio peak filter circuit - with practical example | Audio Judgement
and tried to follow his example just to see if by starting simple I could make the curves change by changing values of the resistor in the notch filter as the author suggested. No joy. Then I just followed your advice and still no change in the curves.
I've got to be doing something wrong. But I can't figure it.
Zip the .dxo ( XSim ) file and then attach it with your next post.
This way it can be reviewed by others.
:_)
This way it can be reviewed by others.
:_)
You're right, that is kind of messed up. Probably I was thinking of how they'd get used (in series or shunt with a driver), but that's not conventional.
Also, I see that I got the calculation for the "shunt notch" depth value wrong in the 'circuit block' (resistor value not right, goes wrong direction with depth).
Hi,
The reason your notch filter wasn't working was because you had C1 shorted out > due to running a connection line through it ( connecting the amp and S1 ).
🙂
PS; I've included a fixed version of your test file
The reason your notch filter wasn't working was because you had C1 shorted out > due to running a connection line through it ( connecting the amp and S1 ).
🙂
PS; I've included a fixed version of your test file
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