NX Otica Build

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russellberg

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NX Otica Build
« on: 10 Mar 2022, 09:29 pm »
Well this is my fourth GR Research project and the first time that I have used a flat pack.  The precision of the work and the care that is invested in the packaging was immediately apparent.  This is very precise and careful work.  I had bought a Wagner Flexio 3000 sprayer because I wanted to have that smoother sprayed on finish.  I started by taping the dadoes and the edges of the braces.  This would maintain a raw edge where the glue was going to come into contact. 


It turns out that if you centre a piece of ¾" painters tape over the edge of the brace the overlap is almost exactly the depth of the dado so you don't end up with unpainted gaps on the edge of the braces.  I then painted everything with Zinsser primer.  I have found that a good primer is essential for painting MDF.  I hand painted an extra coat into the exposed edges of the MDF so that I could sand it down before I sprayed on the first coat.


I really didn't want to be painting inside that tight cabinet and this left me with a pretty good finish inside with out drips or runs.  After I had put on two coats of primer I hand sanded and then began painting the flat black.







After everything was dry I pulled off all the tape.



Then it was time for dry fit and glue up.



The precision of the parts from Jay means that you don't need a lot of glue, or even that many clamps considering the complexity of the glue up.





I then painted the exposed edges with primer and then sanded them to get a nice smooth finish.  Been messy with the paint brush didn't matter too much because this was all going to get another coat of paint with the sprayer.





Early B.

Re: NX Otica Build
« Reply #1 on: 10 Mar 2022, 09:35 pm »
Impressive work, sir.

kickngas

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Re: NX Otica Build
« Reply #2 on: 10 Mar 2022, 09:59 pm »
Great job! Thanks for the tips.  I will be doing the same for my Otica's soon.  Are you going to veneer the sides and front baffle?

russellberg

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Re: NX Otica Build
« Reply #3 on: 10 Mar 2022, 11:26 pm »
Great job! Thanks for the tips.  I will be doing the same for my Otica's soon.  Are you going to veneer the sides and front baffle?
Nope, I am going all black.

sortner

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Re: NX Otica Build
« Reply #4 on: 11 Mar 2022, 01:26 am »
Great job- Speakers look great, man you are in for a treat! I built these with the tripples,  blown away every time I fire them up.

Jay's flat packs are top shelve, would love to see them (pictures) on the web sight!

Cheers,

Steve

kickngas

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Re: NX Otica Build
« Reply #5 on: 11 Mar 2022, 07:58 pm »
Can you please share which specific primer and paint you are using? Thanks! I am looking at the Wagner Flexio's now 😉

Endo2112

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Re: NX Otica Build
« Reply #6 on: 12 Mar 2022, 04:40 am »
Great job indeed!! I love/miss those speakers, they do so many things, so well, like a desert island speaker

Enjoy,

Don

Captainhemo

Re: NX Otica Build
« Reply #7 on: 14 Mar 2022, 07:56 pm »
Hey Russell,  nice to see them coming together, as Don mentioned,  you're  going to love  these  guys.

Great job- Speakers look great, man you are in for a treat! I built these with the tripples,  blown away every time I fire them up.

Jay's flat packs are top shelve, would love to see them (pictures) on the web sight!

Cheers,

Steve

Steve,  thanks for the feedback on the  flat packs :)  Yeah,  would be nice     to once  again be on the  GR Research website....  We've been supplying these cabinet since their introduction along with the  rest of the NX  series,  the Super Series  when it  was previously available, and ofourse ,  our beefed-up version of the  OB servo sub towers from   duals to  6  stacks in both solid and modular  desings for over  6 years.....
Anyhow, looking forward to seeing more progress Russell  !

jay

russellberg

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Re: NX Otica Build
« Reply #8 on: 14 Mar 2022, 10:27 pm »
Can you please share which specific primer and paint you are using? Thanks! I am looking at the Wagner Flexio's now 😉
The primer I used was Zinnser Bullseye 123.  The paint was Home Depot Behr Ultra Scuff Defence matte black.   I watered the primer down about 10%, it is pretty thick.  See the post below, I did run into some odd issues.

russellberg

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Re: NX Otica Build
« Reply #9 on: 14 Mar 2022, 10:35 pm »
I painted everything in my garage that is heated only periodically by space heaters.  I left the heaters on to allow the pain to cure but then they sat in the unheated and damp (Pacific Northwest), garage for about a week.  When I next went to check on them they had these weird discolourations.  I almost looked like milldew but not quite.


These markings where all over the speakers in different places.  Anyone seen this before?  I rubbed them down with a dry cotton rag and it almost completely came off.



I am going to let them sit for a few days inside and see what happens.  If it comes back I will assume its milldew and sand it down and repaint.  They are stored inside the house now.  Aside from the weird stuff on them I am happy with how the pain job turned out. 


Now I'm just waiting on parts :)   

kickngas

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Re: NX Otica Build
« Reply #10 on: 14 Mar 2022, 10:52 pm »
Thanks for the paint/primer call outs. Yeah, that looks like mildew, hope you get that sorted. Like you, I am also awaiting parts, I ordered early November. When did you place your order and when are you expecting delivery? Good thing I am in no hurry!

Peter J

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Re: NX Otica Build
« Reply #11 on: 14 Mar 2022, 11:45 pm »
Under humid conditions water-based home paint can leach ingredients to the surface. This describes it better, methinks:

https://www.benjaminmoore.com/en-us/contractors/job-solutions/troubleshooting/surfactant-leaching

Mildew is mold. It's not mold.

russellberg

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Re: NX Otica Build
« Reply #12 on: 15 Mar 2022, 11:58 pm »
Under humid conditions water-based home paint can leach ingredients to the surface. This describes it better, methinks:

https://www.benjaminmoore.com/en-us/contractors/job-solutions/troubleshooting/surfactant-leaching

Mildew is mold. It's not mold.
Thanks so much for the info.  Im sure that's what it was as it wiped off so easy.  Milldew does not come off this easy.

russellberg

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Re: NX Otica Build
« Reply #13 on: 16 Mar 2022, 12:02 am »
Thanks for the paint/primer call outs. Yeah, that looks like mildew, hope you get that sorted. Like you, I am also awaiting parts, I ordered early November. When did you place your order and when are you expecting delivery? Good thing I am in no hurry!
I ordered second week of December, (My Christmas present ;),  they haven't given me a date just, "when the inductors and tweeters arrive."  I get it, they can't ship what they don't have.
-Russell

russellberg

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Re: NX Otica Build
« Reply #14 on: 30 Jul 2022, 05:23 pm »
Well the parts finally got here last week and they are now finished!  I started with mounting all the drivers then I set up some padded blocking so I could lay them down on their fronts without damaging the drivers.


These diagrams from Rock Ball where so helpful.  I couldn't read a schematic to save my life.

Check out his build post for the rest of them  https://www.audiocircle.com/index.php?topic=169168.0

Keeping everything straight with masking tape labels was essential for me.


Now it was time to face my fears and start wiring the crossover.  This was my first attempt.


I got some wonderful advice from the community https://www.audiocircle.com/index.php?topic=182643.0 here and I made some changes to end up with this.  I didn't follow their advice exactly so any mistakes are mine.  I am still open to advice to changing it.




I plugged it in and to my immense relief everything worked!!  (If at first you do succeed try not to look too surprised.
Wiring the first speaker took me almost two full days of going back and forth over the diagrams, other folks' pictures and reading AudioCircle threads but I got it done.
The next speaker went much faster and last night I got to llsten to something amazing that I built.  That is so satisfying.  I played pink noise through them all night and even those 10 hours of burn in has already made a big difference.

I am really happy with the flat black of the finish.


I know that my room setup is far from ideal but I didn't really understand what sound stage was until I heard these.


This tweeter is unbelievable.


The only thing I haven't done yet is put the NoRes in.  Any thoughts on how much of a difference it makes?  I don't really like the way it looks but I am prepared to install it for a significant increase in sound quality.


For those who have been concerned about using NX-Otica's in a smaller room mine are in a 13x13 basement room and they sound amazing.  As you can see in the pictures there is another room behind that perhaps gives the Oticas room to breathe.  I will give a fuller description of my impressions of how they sound a little later once they have had time to burn in properly. 





corndog71

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Re: NX Otica Build
« Reply #15 on: 30 Jul 2022, 05:40 pm »
Nice job!  Yeah, don’t skimp on the NoRez.  It makes a big difference.

russellberg

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Re: NX Otica Build
« Reply #16 on: 30 Jul 2022, 06:16 pm »
The big wings are intended to be on the inside, right?

Tyson

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Re: NX Otica Build
« Reply #17 on: 30 Jul 2022, 06:47 pm »
I know that my room setup is far from ideal but I didn't really understand what sound stage was until I heard these.

Haha, I know exactly what you mean.   :thumb:



The only thing I haven't done yet is put the NoRes in.  Any thoughts on how much of a difference it makes?  I don't really like the way it looks but I am prepared to install it for a significant increase in sound quality.

I didn't think Norez would make much of a difference in my Super 7's, after all, it was just the bass section, how much difference could it possibly make down there?  Well, a lot, actually.  Definitely put in the Norez on your speakers.



The big wings are intended to be on the inside, right?

Correct.

russellberg

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Re: NX Otica Build
« Reply #18 on: 30 Jul 2022, 07:26 pm »
Thanks Corndog and Tyson, I think Im going to install it.