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

fjhuerta · 21st July 2005, 11:50 PM

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!

inertial · 25th July 2005, 11:42 AM

(sorry for my english)
Maybe 3rd or 4th order better.....

regards

fjhuerta · 25th July 2005, 02:14 PM

From what I've read, a 4th order is easy to implement, so I'd go with that. But why should I use it with the Neo? Is there any reason not to use the 2nd order filter (it's easier, simpler to build...)

Danny · 25th July 2005, 03:10 PM

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.

inertial · 25th July 2005, 03:20 PM

If you absolutely want a very low crossover point ( 2KHz ) a 4th order acoustic target function is the minimum IMHO.
When you will measuring the Neo3 on his cabinet the thing will be clear.
regards,

inertial · 25th July 2005, 03:28 PM

Danny,
please have you a THD graph of the Neo3pdr ( with or without the rear
"plate") ?

Danny · 25th July 2005, 03:42 PM

Quote:

please have you a THD graph of the Neo3pdr ( with or without the rear

I do not. From my experience I have not heard any distortion problems from them though, even when running them down low.

inertial · 25th July 2005, 03:59 PM

(sorry for my english)
Thanks the same,Danny.
I respect your opinion of course.
I asked also to BG the THD graph but they have answered " only for manufacturers"

Anyway I think the THD be similar to the Eton ER4 .
regards,

DanWiggins · 25th July 2005, 04:50 PM

Here's one design we did with the NEO3 PDR tweeter (full dipole operation):

http://www.adireaudio.com/Home/KITDDR.htm

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®

fjhuerta · 26th July 2005, 01:37 AM

Thanks a lot for your help! I was afraid about crossing the unit far too low. I'll start with 2KHz, 2nd order and work my way from there. From what I've read, the tweeter should be a very nice piece of engineering.

21st July 2005, 11:50 PM	#1
fjhuerta diyAudio Member Join Date: Apr 2005 Location: Mexico City	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!

25th July 2005, 03:10 PM	#4
Danny diyAudio Member Join Date: Nov 2002 Location: Texas	Neo's 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. __________________ www.gr-research.com

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25th July 2005, 11:42 AM	#2
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	(sorry for my english) Maybe 3rd or 4th order better..... regards

25th July 2005, 02:14 PM	#3
fjhuerta diyAudio Member Join Date: Apr 2005 Location: Mexico City	From what I've read, a 4th order is easy to implement, so I'd go with that. But why should I use it with the Neo? Is there any reason not to use the 2nd order filter (it's easier, simpler to build...)

25th July 2005, 03:20 PM	#5
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	If you absolutely want a very low crossover point ( 2KHz ) a 4th order acoustic target function is the minimum IMHO. When you will measuring the Neo3 on his cabinet the thing will be clear. regards,

25th July 2005, 03:28 PM	#6
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	Danny, please have you a THD graph of the Neo3pdr ( with or without the rear "plate") ?

25th July 2005, 03:59 PM	#8
inertial diyAudio Member Join Date: Aug 2004 Location: Italy	(sorry for my english) Thanks the same,Danny. I respect your opinion of course. I asked also to BG the THD graph but they have answered " only for manufacturers" Anyway I think the THD be similar to the Eton ER4 . regards,

25th July 2005, 04:50 PM	#9
DanWiggins diyAudio Member Join Date: Aug 2002 Location: Seattle or Shanghai	Here's one design we did with the NEO3 PDR tweeter (full dipole operation): http://www.adireaudio.com/Home/KITDDR.htm 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®

26th July 2005, 01:37 AM	#10
fjhuerta diyAudio Member Join Date: Apr 2005 Location: Mexico City	Thanks a lot for your help! I was afraid about crossing the unit far too low. I'll start with 2KHz, 2nd order and work my way from there. From what I've read, the tweeter should be a very nice piece of engineering.

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