Has anyone simulated a filter for the Somasonus 4" waveguide and sb-acoustics-sb21 tweeter?
I will try to mate this combination to a Kef b110.
Thus I'm searching a circuit layout that could lineraise the output from the waveguide, and then I hope to be able to alingn that with the Kef low pass filter.
Any comments?
I will try to mate this combination to a Kef b110.
Thus I'm searching a circuit layout that could lineraise the output from the waveguide, and then I hope to be able to alingn that with the Kef low pass filter.
Any comments?
Do you have acoustic measurements? If not, I would suggest to buy a mic and perform them yourself.
You can get this in less than three minutes:
1) get the measurements posted by Brandon
2) trace them in vituixcad
3) use the traced data to design your xover
Basically, you have the data already. It's on the somasonus web site. You just need to get it into vituixcad. That's where the tracing utility is useful.
Here are two crossovers for the SB21SDC in the 4" waveguide. They are very similar, I can't remember which one I used.
Baffle is 8 in wide x 13-1/2 in tall with 3/4 inch roundovers on all sides.
Horizontal and Vertical measurements at 20 degree increments are in the zip file if you want to play around with the data.
Baffle is 8 in wide x 13-1/2 in tall with 3/4 inch roundovers on all sides.
Horizontal and Vertical measurements at 20 degree increments are in the zip file if you want to play around with the data.
Thanks guys!
The filter circuit plans posted will be perfect for starting the simulation.
I have tried XSim software, without claming to master it, but never tried vituix cad, would you suggest vituix to be more useful?
Also, I have a microphone; a Line Audio Omni 1, and also a USB sound card.
You can see a CAD image of my project below.
The filter circuit plans posted will be perfect for starting the simulation.
I have tried XSim software, without claming to master it, but never tried vituix cad, would you suggest vituix to be more useful?
Also, I have a microphone; a Line Audio Omni 1, and also a USB sound card.
You can see a CAD image of my project below.
Attachments
If you don’t plan to take measurements at multiple angles then both pieces of software will get you to the same results. Vituixcad supports multiple angles natively and Xsim can do multiple angles if you do your calculations on the side.
This is how I measure the SB21 in a 4" Somasonus waveguide, at 1m, without crossover filter and at a low sound level. I don't really see a way to adapt this to my speaker crossover, maybe I will move to a standard SB21 without the waveguide! The peak at 6.5 kHz seems particularly troublesome.
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You could begin by breaking it down into the component tasks, and if you can simplify it at some point, all the better.
1. High pass filter,
2. Level set,
3. Tilt the treble back up and
4. Flatten the peak.
Two components for the first, one or two resistors for the second, a capacitor across one of the resistors for the third and three components for the fourth.
By the way, some prefer their treble tilted down.
1. High pass filter,
2. Level set,
3. Tilt the treble back up and
4. Flatten the peak.
Two components for the first, one or two resistors for the second, a capacitor across one of the resistors for the third and three components for the fourth.
By the way, some prefer their treble tilted down.
I hear some say that it's problematic to put a notch filter close to the crossover frequency, but I'm not sure about that.
I decided to check the other tweeter, also without filter, and it gave a more expected result, without the disturbing bump:
Now what to do with the first tweeter?
Now what to do with the first tweeter?
I'd just about leave it for now and focus on more important things unless you feel like working on your measurement accuracy.. but I'd expect to find the reason for the difference at some stage, if there is one... For now at least they're similar near the cross.
