DTQWTII from Argentina

[academia50]

Now, the last step before gluing the sarcophagus lid .....😀
I tried the crossover dedicated to the area of ​​low frequencies. And everything works fine again.🙂
Apparently provides only a correction to flatten the peak impedance Deltalite 2510 Eminence II, and there is a cutoff frequency specified, at least I have not found in the description of the page.😕
But I remember having tried these speakers when acquired, directly to the amplifier output without any filter and the middle area is clearly heard.
The upper limit declared by the manufacturer is approximately 4000 Hz.
Well, that middle I hear now highly attenuated, and the treble control of NAD3020 appears to be no ..🙄
So I conclude that this is consistent with the role of these two speakers, which are in theory an additional TQWTII subwofer.😉 The lower zone extends as measured by Troels up to 40 hz. In short, it is a topic for experts crossover network topologies, and I'm not ....😱



DTQWT-mkII mkII crossover


" Crossover topology:
For the two bass drivers we have a textbook 1st order crossover. Impedance correction is provided by R3031 and C3031."

 

[academia50]

I finished gluing one of the two cabinets. Which manufactures presses worked well, distributing the pressure evenly.🙂
I used cuts "under carpet" to avoid damaging the veneer. But then retighten it takes a while because crushed. Humm, for the other cabinet I think that will use my traditional system, old newspapers. But is no longer left me many, now the people read newspapers online ....😀

 

[academia50]

The box is now closed on both side panels ...🙂
The next step is to place the absorbent material.

 

[academia50]

I changed my previous idea and decided to cut 2 mm the rear panel so that it is flush with the board of the binding posts ....🙂

 

[academia50]

I have begun to place the absorbent material.....🙂

 

[academia50]

New developments:

I have almost finished gluing the felt, absorbent material.

Before gluing the cloth top panel must glue it. Binding to 45 degrees is one of the most important and sensitive points for a good finish of the box ...... we'll see how it looks .....

 

[academia50]

Some extra photos 😉

 

[Osvaldo de Banfield]

Lots of tools... Are you carpenter?

 

[academia50]

Lots of tools... Are you carpenter?

Osvaldo:

Sí, trabajé en carpinteria naval mucho tiempo atras, me quedó el oficio y algunas herramientas manuales viejas.
También he comprado algunas nuevas del tipo de mano electricas, el router por ejemplo, muy útil para los agujeros de los parlantes, aunque no imprescindible. Se pueden hacer manualmente, pero , claro, es mucho más trabajo.
El punto mas delicado en este trabajo es lograr buenos cortes en 45 grados para la tapa superior. Con la sierra circular de mano ha sido muy difícil. ( el disco, por ejemplo, tenía mucho " juego " lateral en su eje, lo que hacia muy inexactos los cortes. Tuve que eliminar ese problema. Es una herramienta para trozar, no para trabajos de precisión.Lo ideal es un banco de carpintero como los de las fotos, pero eso cuesta mucho dinero si uno no se dedica exclusivamente a trabajar de carpintero. Y ni hablar del problema con los vecinos !
Saludos !


Osvaldo:

If, naval carpentry work on a long time ago, I left the office and some old hand tools.
I also bought some new type of electric hand router for example, very useful for the holes in the speakers, but not essential. They can be done manually, but, of course, is much more work.
The most delicate point in this work is to achieve good cuts at 45 degrees to the upper cover. With the circular saw has been very difficult. (Disk, for example, had much lateral "play" on its axis, which made very inaccurate cuts. I had to eliminate that problem. It is a tool for cutting up, not to work precisión.Lo ideally is a workbench like the photo, but that's a lot of money if one is not dedicated solely to work as a carpenter. not to mention the problem with the neighbors ! 😀

Regards !

 

[academia50]

The process of bonding the top cover. Presses the extensible have made for this job .... They have a good extension! 🙂

 

[academia50]

The top panel and glued and sanded, ready to apply paint. I have not yet decided tone, but it is not clear, it is not my taste. 😕 I prefer semi dark woods...🙂

 

[academia50]

I worked on the rear panel.
I saw a small error in the plane above attached. (See post 12) The measure is correct because it was added 0.8 cm thickness of the original rear panel, making a total of 3 cm.Pero the arrow must go from the front panel to the rear panel. See bottom of the diagram. The total is correct, 50.8 cm.

 

[academia50]

Here the updates 🙂

 

[academia50]

Leave photos of the latest advances, placement of cushioning the bass sector, and marking the polarity of the wires ...

I also prepared the rear panel with T-nuts for fixing drivers Eminence Deltalite 2510 II. I removed the back board to achieve just leveling with the panel.

 

[academia50]

I forgot placement of T-nuts on the rear panel and the basket without the back seal.
Regards

 

[academia50]

I'll use screws with t-nuts are Allen head type. I could not get in my country appropriate screws for wood and of my taste. I wanted blued (black oxid) and head round type Phillips)
This has taken me a lot, but did not want to do as I advised in stores, "Paint it black" !! 🙄, as sung by the Rolling Stones ...

Up the volume !!!
https://www.youtube.com/watch?v=-dkAiWswi8A


One of four drivers Eminence has come with reverse polarity....😱 You can read something about it here :

http://www.diyaudio.com/forums/pa-systems/296692-eminence-deltalite-2510-ii-error-assembly-2.html

My god, my english is very bad ...😱

Regards

Rolando

 

[DIYBras]

OUCH... reversed magnet polarity... 😱 makes me wonder about Eminence production testing 🙄

I'm thinking of something now ... I made the smaller version, the TQWT, and yet I can not move/lay down this box alone ... I like to have a hoist at home to move it. I imagine when you need to move this DTQWT to the listening room ...

 

[anji12305]

My god, my english is very bad ...😱

Regards

Rolando

Your English is perfect.
Your excellent tutorial is generous.

Kudos



Sent from my Nexus 6 using Tapatalk

 

[anji12305]

OUCH... reversed magnet polarity... 😱 makes me wonder about Eminence production testing 🙄

I'm thinking of something now ... I made the smaller version, the TQWT, and yet I can not move/lay down this box alone ... I like to have a hoist at home to move it. I imagine when you need to move this DTQWT to the listening room ...

This is an important consideration. I built a similar DTQWT cabinet and barely managed to move it from my basement shop up two flights of stairs.

This much plywood is HEAVY.

Sent from my Nexus 6 using Tapatalk

 

[academia50]

Your English is perfect.
Your excellent tutorial is generous.
Kudos

Thanks Kudos ! , it's good to hear, San Google helps a lot, I must admit, although I correct enough ....