GR Neo3 back-cup ideas!

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Hobbsmeerkat

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Re: GR Neo3 back-cup ideas!
« Reply #40 on: 31 Jul 2020, 08:18 pm »
This is fun to watch, I'm looking forward to seeing Danny's testing results on all of this. Nice work Hobbs.

Thanks! Its been a fun project. I've been working on a sealed servo sub base for the NX Studio as well as an MTM/center version of the Studios. but that'll be a different thread going forward :P

Just got confirmation that everything printed well and will be mailed out this weekend.  :thumb:
Danny will get the 2nd model of the cup & spacer along with 5 of the round over bars for the front face of the Neo3.
And I'll be getting the first spacer/cup and the remaining 5 rods.

Im excited to do some of my own testing with these soon! And see how they compare with Danny's results of his cutom neo 3
Ill probably strip the stock cup off. Cant be any harder than delidding Intel i5 & i7 desktop CPUs when that was common back in 2013-2018 :P

Hobbsmeerkat

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Re: GR Neo3 back-cup ideas!
« Reply #41 on: 6 Aug 2020, 02:38 pm »
I got the tracking number for Danny's package,
Says It should arrive Saturday today  :thumb:

Checked the tracking again and its already out for delivery!
« Last Edit: 6 Aug 2020, 04:18 pm by Hobbsmeerkat »

Danny Richie

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Re: GR Neo3 back-cup ideas!
« Reply #42 on: 7 Aug 2020, 04:22 pm »
I got the tracking number for Danny's package,
Says It should arrive Saturday today  :thumb:

Checked the tracking again and its already out for delivery!

Got it.

Hobbsmeerkat

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Re: GR Neo3 back-cup ideas!
« Reply #43 on: 7 Aug 2020, 04:59 pm »
Got it.
Sweet! Mine will be here Tomorrow  :thumb:

Hobbsmeerkat

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Re: GR Neo3 back-cup ideas!
« Reply #44 on: 8 Aug 2020, 09:31 pm »
Looks like my prototype has been delayed.
Hopefully it'll be here Monday.

Hobbsmeerkat

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Re: GR Neo3 back-cup ideas!
« Reply #45 on: 11 Aug 2020, 02:10 am »
Okay, I got my 3D printed cups & bars in the mail today! I also went ahead a ripped off the original back cup, & I'm happy to say they fit really nicely, a little tight, but within tolerances.







Rear face with spacer and hand cut rubber gasket.
A silicon sealant should work well too:


The curved walls in the stock cup are doubled from the base to the first inch. The felt stuffing is glued in and incredibly soft. Not far off from the feeling of cotton balls, and should make for a fair substitute within the custom cups. It is also glued into place, so i imagine any cotton balls used probably should be glued into place as well.

The printed cup is pretty resonant, so lining the inside with a dense product like butyl based liners, or no-rez on the outside surfaces is probably a good idea.

If/when I make any further adjustments/prototypes, I'll probably use thicker walls to reduce the structural resonance, but will probably still recommend such a lining, unless using a dense glue with the cotton that can achieve a similar effect.

Now for the face plate rods:


They aren't quite as smooth as i hoped they'd be, but i imagine some coats of paint and a some gentle sanding should help smoothen them out. Tho I think I also want to make variants that are taller with a gentle curve until it gets close to the tip, I suspect it might be more beneficial to the response than just a simple half-circle option. With a waveguide or faceplate, only 3 rods are needed per Neo tweeter.

Danny Richie

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Re: GR Neo3 back-cup ideas!
« Reply #46 on: 11 Aug 2020, 11:09 pm »
I may be able to take some measurements on these tomorrow.

Hobbsmeerkat

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Re: GR Neo3 back-cup ideas!
« Reply #47 on: 11 Aug 2020, 11:18 pm »
I may be able to take some measurements on these tomorrow.
Awesome! Im excited to see your results! :thumb:

Hobbsmeerkat

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Re: GR Neo3 back-cup ideas!
« Reply #48 on: 12 Aug 2020, 02:48 am »
Hooray for accidentally deleting my whole post by hitting the back button when i wasn't looking! :D

Okay! I cut myself a better gasket that fits the shape of the cup half of the mod, & got some nice results and was able to mount it to the flush mount i got with it. :thumb:



I also have some thermal tape on hand and it made for a pretty effecient way to mount the rods to the face of the Neo3, tho I definitely want to try some taller options once i can also get my hands on my own 3D printer. (Probably in the $300-500ish range?)



That said, i did come across a similar thread to the one i have linked here, but som users there did some testing and they seem to think their tests were done right next to the Neo 3, rather than 1 metre away as Danny's tests are done. And considering that a headphone company did something similar but by rounding the magnets instead to achieve a similar response. (I wanna say it was Hifiman??)

But I definitely want to test if taller "micro-wave guide" rods help in long distance response curves, or if by the time they get to 1M return to standard normal response curve.