Battery test passed and doing some pre listening.. 😁
All the soldering done and all now left is glueing the left panel. The size of these are just perfect and looks really classy! Can someone tell me what kind of effect should I hear in sound,
1. No port at the back
2. No damping material inside
Good work.
IMPORTANT: Mount the tweeter with four bolts/nuts/washers to the waveguide. The two then becomes a single unit that is then mounted into the box.
IMPORTANT: Mount the tweeter with four bolts/nuts/washers to the waveguide. The two then becomes a single unit that is then mounted into the box.
Thanks Joe. Yeah i noticed that i had done it incorrectly and I'm in the process of changing that.
...I was thinking, it would be good if you can specify this amount required in grams/box as well (at least roughly). It would be specifically beneficial to international builders as they would have different materials available locally.
This is basically about density/volume etc, and I think I will post some numbers shortly as a guide, based on Polymax R.3.5.
I have just bought a full bag of 8 and each one can do a pair of Elsinores using the cutting guidance I posted earlier.
https://www.diyaudio.com/community/threads/the-elsinore-project-thread.97043/page-287#post-7433517
Late April 2020 was when my Elsinore's first played music
I finally got around to finish the magnetic grill covers ;-)
Wifey actually prefers the exposed speakers..
My Dog actually curls up in the corner right next to one of the speakers...
I have asked him many times, always nicely, if he would prefer a different spot in the house...
All of a sudden, he acts like he doesn't understand English... Sheeesh!
Meanwhile, my wife and I must actually spell some words out loud as he understands all to well...
Any how, to avoid further tense moments, I made use of some cheap burlap and a hot glue gun.
Besides burlap being a pita to work with and all kinds of imperfections in the fabric I think I'm pretty happy with the results
I know location of these is not ideal, our space is limited..
I finally got around to finish the magnetic grill covers ;-)
Wifey actually prefers the exposed speakers..
My Dog actually curls up in the corner right next to one of the speakers...
I have asked him many times, always nicely, if he would prefer a different spot in the house...
All of a sudden, he acts like he doesn't understand English... Sheeesh!
Meanwhile, my wife and I must actually spell some words out loud as he understands all to well...
Any how, to avoid further tense moments, I made use of some cheap burlap and a hot glue gun.
Besides burlap being a pita to work with and all kinds of imperfections in the fabric I think I'm pretty happy with the results
I know location of these is not ideal, our space is limited..
Thanks Joe. Any chance we could get these numbers by the weekend? As I may finish building my speakers over the weekend most likely!
OK, here we go.
The following is based on a sample, the whole sheet of 1160mm X 560mm Polymax R3.5 with a rated thickness of 180mm.
The whole sheet is 0.67sq.m and the used amount for a pair of speakers is 0.59sq.m, based on the cutting sheet below.
That means that one speaker box is 0.59/2 = 0.295 sq.m and hence based on 180mm rated thickness of 180mm = 53 Litres. Considering the speaker box volume is around 75 Litres, we can see that we have achieved around 70% fill.
Yes, this is unusual for a ported enclosure. The usual thing is just to line the box, but here we have a high level of fill factor. Checking the expected tuning measurements of the port means that we can tell that the box is behaving like a box volume of 100-110 Litres and not that the physical 75 Litres that it actually is.
I know that I am going to get into trouble with some people here, but this kind of tuning of the box, we are trying to get transmission line kind of sound in the bass. I used to build transmission lines many decades ago, and they are the unusual pain to put together. But the bass is the kind of bass that gets out of the box and into the room. The fill and tuning of the Elsinores (and other designs) that I have done, is aimed to get that kind of bass.
So what is the weight? Based on a smaller sample, the full sheet of 0.69sq.m is around 1.8Kg.
The amount used is approx. 88% is around 1.6Kg and about 800gr per box.
You can extrapolate more numbers from the above, but let me know if there is anything else.
A quick question. So as long as you maintain that weight/box and damping on the correct panels, it shouldn't really matter whether you use R3.5 or R3/R2 per se? As they differ in the thickness as I was told by the guys at the insulation shop
If I'm not mistaken, the R rating refers to insulating properties. Therefore when you compare two similar materials with different ratings then it typically only means different thicknesses. When comparing different materials other factors can be different, such as density which will mean thickness is unrelated as well.
It is the aim to get around 70% fill in total and R3.5 gets you that. You can use R3.0 if that is what is available, but likely the fill percentage will be a bit lower around 60%, which is not dramatically bad.
I might add that earlier on I did use R3.0 and there are Elsinores out there that still has that in them. But gradually gravitated to R3.5 and that is the current recommendation. The ULD speakers here has that and so does the NBAC under development right now.
"NBAC" Update:
I am working on 3D printing for the SB26CDC tweeter right now. I am liking the results very much but still needs to sort out the waveguide, hence the delay. But it has lower sensitivity compared to ULD (Purifi) and MFC (polycone). All three versions have that Elsinore sound as dominant qualities, so they are subtly different in interesting ways.
"NBAC" Update:
I am working on 3D printing for the SB26CDC tweeter right now. I am liking the results very much but still needs to sort out the waveguide, hence the delay. But it has lower sensitivity compared to ULD (Purifi) and MFC (polycone). All three versions have that Elsinore sound as dominant qualities, so they are subtly different in interesting ways.
Joe, when you refer to 70% is that of the internal volume? I have nowhere near that on mine, so might need to do some experimenting.
If you are able to do that, let us know your results. Keep in mind that 70% is based on the density of Polymax R3.5 and if you are using something that is also more dense, the 70% may not be ideal. So it comes down to what you are using right now, can you let us know?