Which drivers should I choose?

[johngalt47]

I am building a 2.5 way speaker using Usher 8945P drivers. Using WT-3, I tested all of them and the attachment shows the results.

Which of them should I use as pairs?

[darrenk]

Good morning,

I just noticed some of your params for sample 3 look incorrect; I would double-check and re-do the measurement on that one. From a driver physics standpoint, the Fs being the same and the Mms being half and the Vas being double is impossible. I'm thinking there must have been a wrong added mass or cone diameter used.

As for putting them in pairs, for the most part they look like they'd be pretty close as far as the box sizes go. Using the given information, I would probably match them by looking at your SPL figure (and with the SPL figures as printed by Usher on the driver as a reality check). Otherwise, if you wanted to be very precise, you could look at the actual frequency responses and match them that way.

Darren