Has anyone had any experience with the Neo3 PDR tweeter? Any hints?

Hi all,

I just bought all parts I need to build my first speaker design. It'll be a D'Appolito design, with 2 Focal 5 N 421 woofers and the Neo3 PDR tweeter.

I'm trying to keep the crossover as simple as possible, although from simulations I think I'll definitely need a Zobel network (the woofers have a very low 2.9 Ohm impedance).

Anyway, my plan is to get things going by measuring the speakers in free air, designing a 2nd order x-over, measure every speaker mounted in the box, import the measurements into LSPCad, and then refine the design.

Assuming this plan is OK, is there anything I should know about crossing the Neo3 over? I'll start with a 2nd order Linkwitz-Riley crossover at 2,000 Hz. If the FR plots are correct, I don't think I'll need to use a notch filter... any hints on working with this particular driver?

Thank you very much for your help!

I have been a distributor for those tweeters for a long time and have built a lot of designs using them.

They are pretty easy to work with too.

I have crossed single units as low as 1,500Hz without problems.

A recent design crossed them in the 1,700Hz range with a 3rd order network. The speakers response fell to within +/-2db. It sounded great too.

You should have no problems with crossing them in the 2kHz range.

Base your measurements on 1 meter responses rather than near field. This will be much more accurate.
Here's one design we did with the NEO3 PDR tweeter (full dipole operation):


Overall, I am impressed with this tweeter. Clean and open sounding, fairly good dispersion for the size of the diaphragm, and you can run it down pretty low without any hint of stress or strain (in the design shown, the woofers reached their limits first before the tweeter).

Dan Wiggins
Adire Audio®