FRD data help

[GKF]

guys i need some help
new to xover software where it looks for driver data in a frd file.
how do i start to do this ?
my next build will be scan speak d2905/950000 and rival carbon 6 1/2 woofer
but nowhere is frd data for these 2 drivers
if any of you know and can steer me in the right direction
thank you

 

[Lojzek]

There is specialized software like FPGraphTracer from fprawn labs that makes one able to convert an image of measurement data into a textual file to later be manipulated by other software to arrive at a final frd or zma to be used in a simulator. VituixCAD is a program simulator with a tracer within it. There used to be available SPLTools to trace the curves by was not nearly as practical as the one mentioned in the first sentence.

 

[EarlK]

guys i need some help
new to xover software where it looks for driver data in a frd file.
how do i start to do this ?
my next build will be scan speak d2905/950000 and rival carbon 6 1/2 woofer
but nowhere is frd data for these 2 drivers
if any of you know and can steer me in the right direction
thank you

Actually, it's even more complicated than you think.

Cross-over software requires impedance ( .zma ) files as well as frequency response ( .frd ) files.

Manufacturers ( typically ) don't provide them ( though Dayton Audio does ).

It's up to you to create these 2 file types by using measurement software ( & then exporting the file types from your data captures ).

If that sounds a bit too daunting then consider using ( at this time ) only Dayton drivers ( Solen here in Canada carry most of their drivers ).

Alternately, one can use tracing software ( of the manufacturers spec sheets ) to create these two file types.
- VituixCAD2 has a great tracing tool well worth learning, that's as good as it gets ( for tracing & export ).

Rival Acoustics woofers response curves ( for the Paper/Carbon fiber model ) follow;

These are clear enough pics that one should be able to create/trace .frd + .zma files from them.

ScanSpeak D2905-950000 pdf

 

[GKF]

thank you
very good ideas which show me i should have mentioned that i want to buy some device to test a driver.
the one that parts expess sell or any other
do these show the needed data on my laptop?
see i downloaded the XSim from on a diy audio post . this got the ball rolling

 

[Lojzek]

They do. In fact if you care to save money, the software (REW, Arta Labs, HolmImpulse) is free to use, need only a sound card with in/out and either a microphone with some form of phantom voltage supply or an integrated one as umik-1 which has a sound card within. A separate sound card is useful for performing impedance measurements since modern notebooks do not provide a separate line/mic IN.