wasn't there a link to some cool prototypes in this thread? i know i saw them recently, but for the life of me i just cannot find that link anymore 🙁
This message is for Timn8ster.
I received the NEO3PDR transducers and I was wondering if you could provide me with instructions to have the rear cup removed.
It appears that the rear cup is glued on with some type of epoxy.
Looking at the rear view of your DDR, you manged to remove the rear cups without damaging the unit.
I thought I consult you first before I start to implement some method to remove the cup.
Thank you in advance for your response.
I received the NEO3PDR transducers and I was wondering if you could provide me with instructions to have the rear cup removed.
It appears that the rear cup is glued on with some type of epoxy.
Looking at the rear view of your DDR, you manged to remove the rear cups without damaging the unit.
I thought I consult you first before I start to implement some method to remove the cup.
Thank you in advance for your response.
The glue is not very strong but you do have to be careful. I used a small blade on a hobby knife and slowly ran the blade around the gap between the driver and the rear cup. I slipped once and scratched the frame but not bad. Just make sure the pressure on the blade is not going toward the diaphram as you work around the frame.
just finished reading this thread and consider me intrigued.
I have a 4.1 Magnepan home theater now (no center channel), so I am not a stranger to the open baffle sound. I've always wanted to upgrade my sub to a dipole and build some myself, so this is intriguing.
Also, my music system has Adire HE10.1's that I built about four years ago.
so all that being said . . .
what's the status on the Extremis drivers, replacements, kits, etc? Any idea on where to get them or when the replacements would be available?
Why isn't Adire making them anymore?
Finally, any followups from the people who built a center channel using this design? I imagine this dispersion pattern would be ideal (wide horizontal, narrow vertical).
Thanks,
AC
I have a 4.1 Magnepan home theater now (no center channel), so I am not a stranger to the open baffle sound. I've always wanted to upgrade my sub to a dipole and build some myself, so this is intriguing.
Also, my music system has Adire HE10.1's that I built about four years ago.
so all that being said . . .
what's the status on the Extremis drivers, replacements, kits, etc? Any idea on where to get them or when the replacements would be available?
Why isn't Adire making them anymore?
Finally, any followups from the people who built a center channel using this design? I imagine this dispersion pattern would be ideal (wide horizontal, narrow vertical).
Thanks,
AC
At present only the Extremis 6.4 (4 ohm) is available; the 8 ohm are reserved for kit providers Exodus Audio and RAW Acoustics. We have our designer working on a drop in replacement but that is still months away.
Bob
Creative Sound Solutions
Bob
Creative Sound Solutions
I don't recall Adire ever manufacturing the Extremis other than the prototypes. They did the design work.
Ah, I see. I first saw it here, and then read more on their website. Hence, the assumption . . .
I have a friend on here who is pitching using some different drivers for a similar result -- but it would require playing around with the crossover. I'm a bigger fan of building something someone else has already tested 🙂
Thanks for the replies!
AC
I have a friend on here who is pitching using some different drivers for a similar result -- but it would require playing around with the crossover. I'm a bigger fan of building something someone else has already tested 🙂
Thanks for the replies!
AC
Crossover question
Okay, even though this exercise is academic until a replacement driver comes out . . .
I was looking at the crossover schematic for the DDR and had two questions:
One, it says it's a 6th order Linkwitz-Reily alignment, but it looks more like a 4th order Link-Reily with a parallel R-L-C notch filter at the tweeter. What am I missing here?
I am by no means an expert on crossovers, so I'd like to learn more (espcially what makes this design work while others have failed in the bass range).
Two, that parallel R-L-C circuit on the tweeter models as a notch filter centered on about 12,900 kHz with a Q bandwith of 1.61 and an 11 dB cut. That seems like a really big cut in the last octave! What is the purpose of that filter? I played around with Passive Crossover Design Calculator 2.0 to get those numbers (and I had to reverse engineer, so they're not exact).
Anyway, I'm intrigued on how Dan got this to work and crossover seems to be the key -- so I'm trying to understand the crossover.
Any thoughs on this? I appreciate it.
AC
Okay, even though this exercise is academic until a replacement driver comes out . . .
I was looking at the crossover schematic for the DDR and had two questions:
One, it says it's a 6th order Linkwitz-Reily alignment, but it looks more like a 4th order Link-Reily with a parallel R-L-C notch filter at the tweeter. What am I missing here?
I am by no means an expert on crossovers, so I'd like to learn more (espcially what makes this design work while others have failed in the bass range).
Two, that parallel R-L-C circuit on the tweeter models as a notch filter centered on about 12,900 kHz with a Q bandwith of 1.61 and an 11 dB cut. That seems like a really big cut in the last octave! What is the purpose of that filter? I played around with Passive Crossover Design Calculator 2.0 to get those numbers (and I had to reverse engineer, so they're not exact).
Anyway, I'm intrigued on how Dan got this to work and crossover seems to be the key -- so I'm trying to understand the crossover.
Any thoughs on this? I appreciate it.
AC
Re: Crossover question
The total response is the electrical response cascaded with the acoustical response of the driver. 4th order cascaded with 2nd order is 6th order.
There is a peak in the Neo's frequency response, however you might be off a bit on the frequency and Q of your calculation, see here: http://www.zaphaudio.com/nondomes/standard.html
One could redesign the DDR crossover for the Extremis 6.4 (4 ohm) if people are sure that it is still available.
Pete B.
arc2v said:
The total response is the electrical response cascaded with the acoustical response of the driver. 4th order cascaded with 2nd order is 6th order.
There is a peak in the Neo's frequency response, however you might be off a bit on the frequency and Q of your calculation, see here: http://www.zaphaudio.com/nondomes/standard.html
One could redesign the DDR crossover for the Extremis 6.4 (4 ohm) if people are sure that it is still available.
Pete B.
Thanks for the quick reply.
I got the numbers by manually tweaking the crossover calculator until I got close. I know it isn't perfect, but at least now I understand the why.
So that's all very interesting. I was unaware of the peak of the Neo3PDR, so that makes sense, and it seems the padding resistors basically sacrifice 6 to 10 dB of output on the high end to match it up with the rolloff in the lows.
That explains what Dan mentioned on page 4 or 5 of this thread about having to sacrifice efficiency for extension.
Right now I'm trying to duplicate the design using a PE Reference Series 8" driver. Nowhere near the power handling of the Extremis, but good low extension from the larger area. It will be an interesting tradeoff. I imagine I'll have to tweak some in-room to get the response flat to 80, where the sub can take over. I have the drivers now, and just need to start playing around with the crossover.
Thanks again.
(and if he reads this, thanks to Dan Wiggins for coming up with a great design)
AC
I got the numbers by manually tweaking the crossover calculator until I got close. I know it isn't perfect, but at least now I understand the why.
So that's all very interesting. I was unaware of the peak of the Neo3PDR, so that makes sense, and it seems the padding resistors basically sacrifice 6 to 10 dB of output on the high end to match it up with the rolloff in the lows.
That explains what Dan mentioned on page 4 or 5 of this thread about having to sacrifice efficiency for extension.
Right now I'm trying to duplicate the design using a PE Reference Series 8" driver. Nowhere near the power handling of the Extremis, but good low extension from the larger area. It will be an interesting tradeoff. I imagine I'll have to tweak some in-room to get the response flat to 80, where the sub can take over. I have the drivers now, and just need to start playing around with the crossover.
Thanks again.
(and if he reads this, thanks to Dan Wiggins for coming up with a great design)
AC
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