Frd and Zma file creation

[TBone211]

I’ve recently started a speaker building project and have reached the point whereby I need to make some frd and zma files to further my design. I’m local to the south west of the UK and was wondering if anyone on here was nearby and had the tools to do so or knew someone nearby who did??

 

[AllenB]

Do you want to turn your measurements into these files? in which case you already can.. or do you want to trace plots to make the files? in which case you can either use a tracer or post them here for someone to do.. or something else?

 

[TBone211]

Do you want to turn your measurements into these files? in which case you already can.. or do you want to trace plots to make the files? in which case you can either use a tracer or post them here for someone to do.. or something else?

I want to see if anyone has the equipment to be able to get the measurements to make files as I don’t currently have any of this equipment myself but want to get more accurate frequency responses in the box I will be using

 

[AllenB]

Ok. Also, an option that doesn't require equipment is factory responses put through a diffraction simulation.

 

[TBone211]

Ok. Also, an option that doesn't require equipment is factory responses put through a diffraction simulation.

Is this as good as getting actual measurements?? If so is there one you would recommend. Then for impedance is using the factory figure a good idea or is there a simulator that can measure this?

 

[AllenB]

Baffle diffraction simulation has the potential to be quite accurate, although simulators can use simplified models. There are many people that use only simulation to design, although measurement is to be preferred. So if you're not set up for measurement then simulation is a reasonable alternative.

Keep in mind that response variations can average out over different angles, so regardless of which way you do it, it's not always a good idea to jump on every peak the baffle causes.

is there a simulator that can measure this?

There are several. The FRD consortium spreadsheet is getting harder to find, but there's this one from Jeff Bagby - http://audio.claub.net/software/jbabgy/BDBS.html
..also Vituixcad and Tolvan have simulators.