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Eminence Delta Pro 18 A in prism sealed 150 liters
Eminence Delta Pro 18 A in prism sealed 150 liters
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Old 24th November 2018, 12:06 PM   #21
academia50 is offline academia50  Argentina
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I understand the idea, thank you.

Just a doubt, why do you say two guides? to do it in two passes, one on the bottom and one on the top?

I have to review the strawberries that I have in my possession, if I find a 45 degree one, I think that with a single pass it will reach because the thickness of the MDF is 18 mm.

Regards

PS : Strawberries , they are called strawberries here ... the translation is correct ....

Fresas Para Router Madera - Fresas en Mercado Libre Argentina[A:fresas-para-router-madera]

Last edited by academia50; 24th November 2018 at 12:19 PM.
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Old 24th November 2018, 01:46 PM   #22
academia50 is offline academia50  Argentina
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An interesting link about the behavior of acoustic cabinets in corners


corner loaded louspeakers
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Old 24th November 2018, 03:29 PM   #23
RobWells is offline RobWells  United Kingdom
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Quote:
Originally Posted by academia50 View Post
I understand the idea, thank you.

Just a doubt, why do you say two guides? to do it in two passes, one on the bottom and one on the top?

I have to review the strawberries that I have in my possession, if I find a 45 degree one, I think that with a single pass it will reach because the thickness of the MDF is 18 mm.

Regards

PS : Strawberries , they are called strawberries here ... the translation is correct ....

Fresas Para Router Madera - Fresas en Mercado Libre Argentina[A:fresas-para-router-madera]
I have always done stuff that needs to be accurate in 2 passes (from back when I was a tool maker) so I guess it's just a habit of mine.. rough cut to remove the bulk and final cut to make good. (tool is more accurate when it doesn't need forcing ?)

Strawberry caught me out but when you said 45 degree it suddenly made sense
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Old 24th November 2018, 05:04 PM   #24
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by RobWells View Post
I have always done stuff that needs to be accurate in 2 passes (from back when I was a tool maker) so I guess it's just a habit of mine.. rough cut to remove the bulk and final cut to make good. (tool is more accurate when it doesn't need forcing ?)

Yes, I was very perfectionist in everything I did, I understand you, but there is not much time left for details .....

I understand, you say in a first approach and a final.

Well, I think it's better to prevent two passes ... if you exceed, there's no going back ...


Although you can always supplement with a glued lamimate and start again ...



Quote:
Originally Posted by RobWells View Post
Strawberry caught me out but when you said 45 degree it suddenly made sense
straberry beatles - Google Search

Do not worry, I was many years to understand one day the meaning of The Beatles - Strawberry Fields Forever, and in the end it was just a remembrance, but it is not clear to me, was there a consensual sexual act or a violation? I guess that anyway, the pants could hang, as a war trophy or as a romantic memory ... well I guess the first thing would be more typical of the Rolling Stones
And to think that one believed that he understood the "message" ....

Last edited by academia50; 24th November 2018 at 05:13 PM.
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Old 27th November 2018, 08:21 PM   #25
academia50 is offline academia50  Argentina
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I have found a big mistake in my work !!!!

The previous simulations with Win Isd were correct, they correspond to 300 liters of internal volume, but the measurements of the box that I have begun to build are exactly half....

I do not know what happened, but something aroused my suspicions .....
My DTQWTII cabinets are gross 150 liters, and really, these prisms did not seem to be double the size, so I decided to corroborate everything.

Let's go in parts, as Jack the ripper said ...

The base of the prism (irregular) can be calculated in several ways, the most common is multiplying the three dimensions of it, that is:

0.50 m x 0.50 m x 0.70 m = 125 cm2 (0.125 m2)

The height the prism is 1.20 meters.

The formula for the volume is: Base surface multiplied by height, that is:

0.125 x 1.20 = 150 liters

This is the volume taking the external dimensions and without calculating the Vas of the speaker and the reinforcements, in practice, the abundant filling of polyfill will comfortably compensate for this .

I leave all the simulations again, they are final this time, I'm sorry ......


I have not found a way to change the title of the thread, maybe a moderator can do it so as not to create unnecessary expectations when reading "300 liters"...

I sorry again....
Attached Images
File Type: jpg - 8Db at 40 Hz.jpg (139.1 KB, 217 views)
File Type: jpg - 13db at 30 Hz.jpg (139.0 KB, 215 views)
File Type: jpg - 19 DB at 20 hz.jpg (135.9 KB, 214 views)
File Type: jpg Box 150 litros closed 0.685.jpg (121.3 KB, 213 views)
File Type: jpg F 10 36 Hz.jpg (120.9 KB, 214 views)
File Type: jpg Cone excursion.jpg (141.1 KB, 8 views)
File Type: jpg F3 63 Hz.jpg (120.1 KB, 7 views)
File Type: jpg Group Delay.jpg (125.4 KB, 6 views)
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Old 27th November 2018, 08:24 PM   #26
academia50 is offline academia50  Argentina
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Last pics simīs .

Vol : 150 liters
Q: 0.685
F3 : 63 Hz
F10 : 36 Hz
Attached Images
File Type: jpg Impedance phase.jpg (133.9 KB, 7 views)
File Type: jpg Impedance.jpg (133.0 KB, 9 views)
File Type: jpg Maximum power.jpg (132.1 KB, 9 views)
File Type: jpg Maximum SPL.jpg (140.3 KB, 7 views)
File Type: jpg SPL.jpg (141.1 KB, 14 views)
File Type: jpg Transfer function magnitude.jpg (134.9 KB, 15 views)

Last edited by academia50; 27th November 2018 at 08:29 PM.
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Old 29th November 2018, 12:42 AM   #27
freddi is offline freddi  United States
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Eminence Delta Pro 18 A in prism sealed 150 liters
(I've been ill for a month - got better then seems like a flu has hit today)

fwiw -

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Old 29th November 2018, 01:18 AM   #28
freddi is offline freddi  United States
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Eminence Delta Pro 18 A in prism sealed 150 liters
and approximate effect of a low loss 500uF series cap

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Old 1st December 2018, 04:34 PM   #29
academia50 is offline academia50  Argentina
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Thanks freddi !
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Old 3rd December 2018, 06:45 PM   #30
academia50 is offline academia50  Argentina
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It has been raining a lot here and the MDF as we know is highly affected by humidity and we must protect it.

So until I can recover from the knee arthroscopy, I added some new stuff in the kitchen of the house.

Here is the new 10.6 ft3 refrigerator !

Now, Waf is beginning to show me that everything has a limit, I have invaded territory of his property .......

"Hey, heal up soon and get those crap out of here! "
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File Type: jpg IMG_20181203_151135.jpg (360.6 KB, 62 views)
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