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Old 19th September 2012, 10:32 AM   #1301
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Did I post that...? Must have been some time ago.

The two links worked for me.

Cheers, Joe R.
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Old 20th September 2012, 09:51 AM   #1302
irext is offline irext  Australia
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Originally Posted by spoonted View Post
Back in Black......... 4 coats of black 5 coats of clear and polishing.

Lots of beers to hand polish the wave guides turned out good,thanks again Joel.
They look brilliant. A collegue of mine is also in the process of building a pair of Elsinore,s and he was also looking at finishing in piano black. I will steer him in your direction if you don,t mind. Very nice work. It,s great to see so many different takes on finishing.
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Old 20th September 2012, 12:25 PM   #1303
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Originally Posted by irext View Post
...and he was also looking at finishing in piano black....
Looks stunning when it's done well and horrible if it isn't.

I think you have to be some kind of Sado-Masochist. LOL

Good luck - in the best sense of the word. I wish mine were like that too.

Cheers, Joe R.
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Old 21st September 2012, 01:11 AM   #1304
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Originally Posted by irext View Post
They look brilliant. A collegue of mine is also in the process of building a pair of Elsinore,s and he was also looking at finishing in piano black. I will steer him in your direction if you don,t mind. Very nice work. It,s great to see so many different takes on finishing.

Thanks for the complements.

And yep you need a spray booth at least and a down draft oven is best.

I tried in my shed with plastic everywhere, wet down the floor and used two pack with a very quick drying time and you still get dust particles. Its not bad but nothing compared to doing it properly using the right equipment.

A controlled environment is key.

Lots of sanding between coats 400 grade up to 1200+ then polishing with a cutting compound.

Cheers
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Old 21st September 2012, 01:23 AM   #1305
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Originally Posted by spoonted View Post

Lots of sanding between coats 400 grade up to 1200+ then polishing with a cutting compound.

Cheers
And he will kill any of you who puts a scratch on them !!!

So it ala CSI - always wear gloves.

Cheers, Joe R.
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Old 2nd October 2012, 04:40 PM   #1306
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JR Minis - Part 2

Here is the Crossover:


Click the image to open in full size.

The following shows ON Axis response, impedance and impedance phase:

Click the image to open in full size.

The increased output centered around 150Hz is primarily an artifact of mic proximity effect - so ignore.

While the negative phase is -50 degrees @ 3KHz, the impedance is still high at almost 10 Ohm. The impedance does not drop below 5 Ohm. The speaker is not hard to drive.

Let's take a look at the OFF Axis response:

Click the image to open in full size.

It is actually smoother OFF Axis, but a bit more rolled off above 10KHz.

Now for a simulated 500Hz square wave:

Click the image to open in full size.

Even though the tweeter is not connected in phase, the speaker remains phase coherrent up to a reasonably high frequency.

That's it!

Joe R.

I have 4 JR Mini boxes made up from my cabinet construction experiments and decided I want to complete them..

My question is can I use the Nomex HDS woofer without Crossover change?

Thanks, Joel
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Old 2nd October 2012, 10:55 PM   #1307
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Quote:
Originally Posted by Joel Wesseling View Post
I have 4 JR Mini boxes made up from my cabinet construction experiments and decided I want to complete them..

My question is can I use the Nomex HDS woofer without Crossover change?

Thanks, Joel
Rather than scrounge around trying to find the crossover schematic you have there, could you email or post it. The answer should be yes, but need to take into account that the HDS Nomex version is slightly more sensitive (and efficient, even though both is not always the case, here it is) and affects the level of the Tweeter, or else it will sound brighter than intended.

Cheers, Joe R.
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Old 2nd October 2012, 11:49 PM   #1308
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Rather than scrounge around trying to find the crossover schematic you have there, could you email or post it. The answer should be yes, but need to take into account that the HDS Nomex version is slightly more sensitive (and efficient, even though both is not always the case, here it is) and affects the level of the Tweeter, or else it will sound brighter than intended.

Cheers, Joe R.
[QUOTE]Rather than scrounge around trying to find the crossover schematic you have there, could you email or post it./QUOTE]

Might be missing what you asking but the crossover I have is same as in
post 1306..

Thanks.. Came across a guy in California that had several boxes of the NOMEX
Have to search for him again...

Joel
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Old 3rd October 2012, 01:00 AM   #1309
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Quote:

Might be missing what you asking but the crossover I have is same as in
post 1306..
OOPS!

Didn't see that. Will look at it and report back asap.
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Old 3rd October 2012, 12:26 PM   #1310
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OOPS!

Didn't see that. Will look at it and report back asap.
Thats great, thanks

Looks like theres lots of the woofers out there...

Joel
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