When using XSim to model, should I be "tuning" the driver for baffle step loss below the baffle step frequency? For example I am doing a 2 1/2 way and my BSF is 350 hz. Should I tune the half woofer down 3 db for loss? Right now the sim shows the system Fr bumped up when in reality it should be flatter. Cant really fool the Mid woof.
Another related question: In a 2,5 way do the 2 woofers have to have independent boxes? I have the 2 sharing one box.
Thanks
Another related question: In a 2,5 way do the 2 woofers have to have independent boxes? I have the 2 sharing one box.
Thanks
Member
Joined 2003
Xsim, and any crossover sim for that matter, just applies the transfer function of whatever filter you design to the response provided, so the result is only as accurate as the data you put into it. Is your frequency response meaured on your baffle, spliced with nearfield + baffle diffraction? Or is it some traced manufacturer half space response? Properly measured and processed data will result in accurate simulation, bad data = bad simulation. Xsim is limited to single axis simulation only and doesn't include any tools for response processing, so I'd recommend VituixCAD as a modern "does it all" simulation and response processing tool.
ok , but is my thinking correct that if I take the manufacturers frd and input into the tool, it doesnt know there is baffle step loss so if I want to "simulate" in a rough way I would have to lower the output below the bsf?
Member
Joined 2003
The crossover simulation doesn't "know" anything, it just does math. Sure, you can do some "rough" sim by 5-6dB loss, not 3..or you could just process the data so the response includes it and create something resembling reality. It's not hard.
How will you include the required acoustic delay using manufacturer data? just a guess I assume?
To answer your question on 2.5way, if the drivers are the same and operate using the same filter, they can share the same airspace. That is, the 0.5 way should have it's own chamber if it were me.
How will you include the required acoustic delay using manufacturer data? just a guess I assume?
To answer your question on 2.5way, if the drivers are the same and operate using the same filter, they can share the same airspace. That is, the 0.5 way should have it's own chamber if it were me.
Last edited:
If you do the 2.5 way the conventional way, you can model the crossover with just 1 woofer and ignore the baffle step. Then you can add an inductor to cut the lower woofer at 350Hz.
Thanks Allen, I was ignoring the bump up in the model knowing that in actuality I was getting loss.