Eminence Delta Pro 18 A in prism sealed 150 liters

academia50 · 2019-05-07 7:56 pm

I have found two hardwood slats, (here we call it teak) and I thought it would not be too much to place two cross reinforcements in the upper compartments to increase the rigidity and raise even higher
the resonance of the panels outside the working range ...
I had to cut them in half, (they were too big and not enough for both cabinets, and yes, the idea is to take advantage of all the elements that I have at my disposal ...

I do not use all the tools offered by Paint, so the letters and lines seem to be written by someone suffering from Parkinson's Disease ......

Luckily that is not my case, and I hope you understand the idea of how they will be installed.

This is going to be very heavy ...

Osvaldo de Banfield · 2019-05-07 8:10 pm

Che, ¿pero agregar tanto refuerzo no te quita excesivamente volumen interior? ¿Tuviste eso en cuenta en el diseño original? Ojo, no es una crítica molesta, sinó una simple sugerencia constructiva.

It seems to me that to add too reinforcements inside the cabinet will reduce internal volume too much. Did you take in mind when designing the box? I am not criticizing the construction, only a constructive suggestion.

academia50 · 2019-05-07 8:12 pm

Osvaldo de Banfield said:
I was cheating. Say to those gilazos that he says "few means and highs" and "piped sound " that in the originals of Karlson he himself says that it is necessary to use speakers of extended range or coaxial, what a bunch of ********, they do not know nor to read.
As of 15" I didn't have (those of the photos are repaired units), I coaxed them myself with a 4 "tweeter in front of them.

Los estuve chusmeando. Decile al gilazo que dice "pocos medios y agudos" y "sonido entubado" que en los originales de Karlson él mismo dice que hay que usar parlantes de rango extendido o coaxiales. Que manga de pelotudos, no saben ni leer. Como de 15" yo no tenía (esos de las fotos son reenconados), los coaxiales me los hice yo mismo con un tweeter de 4" delante.

I had Karlson cabinets with Leea 12-inch extended-range speakers, it was many years ago and I do not think it lacked highs. They were those of the metallic dome, I do not remember the exact model....
But of course, I could listen to 20 Khz at 18 years of age .....
In any case, what I liked most was the great sound stage they achieved.

academia50 · 2019-05-07 8:24 pm

Osvaldo de Banfield said:
Che, ¿pero agregar tanto refuerzo no te quita excesivamente volumen interior? ¿Tuviste eso en cuenta en el diseño original? Ojo, no es una crítica molesta, sinó una simple sugerencia constructiva.

It seems to me that to add too reinforcements inside the cabinet will reduce internal volume too much. Did you take in mind when designing the box? I am not criticizing the construction, only a constructive suggestion.

Yes, it is contemplated, the filling will compensate all the reinforcements with spades.
Before closing the baffle I will calculate all the extra volume that I added, to have an approximate idea of the resulting Qtc.
It will not be exact because there is no way to calculate exactly the percentage of virtual volume that is added with the filler material. But surely it will not be higher than the ideal of 0.707, although I prefer it to be less.

Si, esta contemplado, el relleno compensara todos los refuerzos con creces.
Antes de cerrar el baffle calculare todo el volumen extra que agregué, para tener una idea aproximada del Qtc resultante.
No será exacto porque no hay forma de calcular exactamente el porcentaje de volumen virtual que se agrega con el material de relleno. Pero seguro no será superior al ideal de 0.707, aunque yo prefiero que sea menos.

Osvaldo de Banfield · 2019-05-07 8:47 pm

academia50 said:
the great sound stage they achieved.

Those 3 depicted below, are powered from an SS amp made with TDA2006´s for the woofers (6W) and TDA2003's for the tweeters. I can ensure you that never could I give the volume pote over ½ its resistance (They are linear, not log, a mistake I do 20 years ago) because my home becomes destroyed. Glasses in the windows, walls and floor (1° Floor) shakes markedly.

HammerSandwich · 2019-05-07 10:04 pm

academia50 said:
...it would not be too much to place two cross reinforcements in the upper compartments to increase the rigidity and raise even higher the resonance of the panels outside the working range...

I wouldn't worry about bracing the top & side panels. Top is small, making its resonance naturally high. The sides lie against the walls, so their output is easy to absorb. Damping the baffle seems like the #1 priority here.

IIRC, you're already using the basket for this. Maybe put the teak on edge, radially around the cone to stiffen the baffle without reflecting or blocking the rear wave.

freddi · 2019-05-07 10:12 pm

academia50 · 2019-05-08 12:56 am

HammerSandwich said:
I wouldn't worry about bracing the top & side panels. Top is small, making its resonance naturally high. The sides lie against the walls, so their output is easy to absorb. Damping the baffle seems like the #1 priority here.

IIRC, you're already using the basket for this. Maybe put the teak on edge, radially around the cone to stiffen the baffle without reflecting or blocking the rear wave.

I think you have not seen that the baffle panel is twice as thick as the side walls, they are
2x 18 mm: 36 mm !

Anyway, you're right, I'm looking to reinforce even more the panels in the lower sector where the speaker will go ...
I think that some strips glued and screwed directly on them will be enough ...

academia50 · 2019-05-08 12:59 am

freddi said:
re: Karlson - many thanks for the links. As you may know. I have a few. Here's some of mine

Wow....

Projects by fanatics, for fanatics .........of Karlsons' !

academia50 · 2019-05-09 6:05 am

Osvaldo de Banfield said:
Those 3 depicted below, are powered from an SS amp made with TDA2006´s for the woofers (6W) and TDA2003's for the tweeters. I can ensure you that never could I give the volume pote over ½ its resistance (They are linear, not log, a mistake I do 20 years ago) because my home becomes destroyed. Glasses in the windows, walls and floor (1° Floor) shakes markedly.

Yes, Fletcher and Mundson were right, human ears are logarithmic ....
The same happened to me when I built my Rca power with linear volume controls, thinking that the volume of the preamplifier would do the whole process, but it was very difficult to handle the volumes, especially in the low levels, I had to change them for the logarithmic potentiometers, and I found some "modern" but very small when I went to buy them.

Sic Mallory Argentines? Do not even dream about it ! From Japan ? neither !
Chinese, Taiwan or Malasya. It is what it is.

Yes, with efficient speakers and Karlson in between, 6 watts are a lot of power.

Osvaldo de Banfield · 2019-05-09 1:11 pm

In my case, with a president whose name was capicúa (I couldn't find translation), were the only slider pot of 100K stereo I can found. Bad old times. Do you remember: "Revolucion productiva" and "salariazo" ?

academia50 · 2019-05-10 7:17 pm

Osvaldo de Banfield said:
In my case, with a president whose name was capicúa (I couldn't find translation), were the only slider pot of 100K stereo I can found. Bad old times. Do you remember: "Revolucion productiva" and "salariazo" ?

How to forget those times if we already went back to the old ways?
The rules of the forum say that you should not post "politics or religion", - which I see very logical - so we better leave it here ......

Capicúa is a word whose syllables are readable from the front to the back or from the back to the front.

For example :

Menem, former Argentine president

Osvaldo de Banfield · 2019-05-10 7:50 pm

academia50 said:
The rules of the forum say that you should not post "politics or religion",^

Where did I write any about politics? Just I mention two phrases of an extinct politic, not his name nor any comment about him.

academia50 · 2019-05-10 8:22 pm

Osvaldo de Banfield said:
Where did I write any about politics? Just I mention two phrases of an extinct politic, not his name nor any comment about him.

There, better use the MP

academia50 · 2019-05-18 2:07 am

A little late, but here I leave some images of the last work, which is not yet finished.
I thought about doing a "fit" between the vertical bar that can be seen and the next that will be horizontal, but definitely not worth the extra work.

At least for me.......

PS: I treasured these chrome-plated brass screws for a long time, finally the time came to give them a utility !

academia50 · 2019-05-22 1:28 am

The crosshead of the upper compartment is finished. The reduction of resonance is remarkable when compared to the central compartment (simple test, striking the knuckles)

The cut at 45 degrees with the miter is simple, but calculate the exact distance not so much ....
The old trick of the thread has worked again, remember not to tighten the same, just enough to keep it horizontal.

academia50 · 2019-05-27 4:01 pm

The reinforcements of the middle and upper sector are ready....

academia50 · 2019-05-27 4:06 pm

In the lower sector I will place a vertical reinforcement on each side of the side panels. :up:

Osvaldo de Banfield · 2019-05-27 4:17 pm

"que la fa lunga"...diría mi abuela. Yo tenía los Karlson andanado de un día para el otro.

Such a long job! I had my Karlson working in a day.

Lunchietey · 2019-05-27 5:18 pm

Why is this taking so long?

I built a fully braced tansmission line last week in 2 days(without paint time) and tested. All of these tiny braces etc will do very little, the box sides aren't that big and you're using low power anyway so the box flex will be minimal as is with such a thick baffle. The triangular braces would probably be plenty already.

Just finish it already, you can build a whole house in 5 months!

Eminence Delta Pro 18 A in prism sealed 150 liters

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