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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 28th October 2018, 10:27 PM   #1
academia50 is offline academia50  Argentina
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Default Eminence Delta Pro 18 A in prism sealed 150 liters

Hello

This thread is the continuation of a cartoon that started here:


Vintage JBL for subwofer

I transcribe the text of my notes:

DEFINITIVE DECISION :
CORNERS !
I will use this two furniture, the white will be for the box and the red for the front panel.

Box:
Prism
Volume 300 liters gross
Design: sealed
QTC: 0.550
Perfect transients, although less SPL, this is compensated with a gain of + 3 db in each box when increasing to this volume ..
So for the same SPL will need half the power (watts)

These pieces of furniture have been a gift from a friend who did not use them anymore.

They serve ? he asked me .....

The next day they were in the hall, WAF asked where we would take the dog for a walk, for the same place that we will enter and leave, I answered, or is not he another member of the family?

The prism (irregular) will be 0.50x0.50x0.70, and the height of the box of 1.40 meters.

Soon I will attach the results of the simulations with WinIsd

Ohhh, I will have to make many gifts (and many invitations to go out to dinner) to my wife, these monsters are not easy to accept in a living room ....
I am a lucky man, yes sir !
Attached Images
File Type: jpg IMG_20181028_184053.jpg (820.2 KB, 1288 views)
File Type: jpg IMG_20181028_181504.jpg (870.7 KB, 1253 views)

Last edited by academia50; 28th October 2018 at 10:44 PM.
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Old 29th October 2018, 08:48 PM   #2
academia50 is offline academia50  Argentina
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Here the simulations

I have attached SPL to 20, 30 and 40 hertz which is the range that I am most interested in reproducing with these boxes, remember that there will be room gain because they are located in corners of the room and are two cabinets, so we will have to add a minimum ( FWIW ) of + 3 DB to each graph of SPL in practice.
Attached Images
File Type: jpg Transfer function magnitude.jpg (136.2 KB, 1209 views)
File Type: jpg SPL at 20 hertz.jpg (147.0 KB, 1145 views)
File Type: jpg SPL at 30 hertz.jpg (145.5 KB, 1115 views)
File Type: jpg SPL at 40 hertz.jpg (145.3 KB, 65 views)
File Type: jpg Transfer function phase.jpg (134.1 KB, 60 views)
File Type: jpg Cone excursion.jpg (144.0 KB, 41 views)
File Type: jpg Group delay.jpg (128.6 KB, 27 views)
File Type: jpg Impedancia curve.jpg (135.3 KB, 33 views)
File Type: jpg Impedancia phase.jpg (137.5 KB, 36 views)
File Type: jpg Maximum Power.jpg (137.2 KB, 36 views)
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Old 29th October 2018, 08:55 PM   #3
academia50 is offline academia50  Argentina
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....the last, power management.
Attached Images
File Type: jpg Maximum Power.jpg (137.2 KB, 61 views)
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Old 29th October 2018, 09:09 PM   #4
academia50 is offline academia50  Argentina
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Why does the group delay increase as the volume of the box increases? Is it closer to the behavior of a BR box? Is that ?

Compare 137 liters ( Q 0.707 ) with 300 liters ( Q 0.550)
Attached Images
File Type: jpg Group delay.jpg (128.6 KB, 79 views)
File Type: jpg Group delay Q 0.707.jpg (127.9 KB, 54 views)
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Old 29th October 2018, 09:16 PM   #5
academia50 is offline academia50  Argentina
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Here frequency response vs spl graph, of the 137 liters box and Q 0.707.
Attached Images
File Type: jpg 137 litros Q 0.707.jpg (119.5 KB, 84 views)
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Old 30th October 2018, 01:09 AM   #6
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by academia50 View Post
....the last, power management.


Power management was repeated, the missing graph is this :

Maximum SPL


I'm sorry
Attached Images
File Type: jpg Maximum SPL.jpg (141.6 KB, 91 views)
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Old 30th October 2018, 09:57 PM   #7
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by academia50 View Post
Why does the group delay increase as the volume of the box increases? Is it closer to the behavior of a BR box? Is that ?

Compare 137 liters ( Q 0.707 ) with 300 liters ( Q 0.550)

Someone can shed some light on this ?
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Old 31st October 2018, 02:06 AM   #8
freddi is offline freddi  United States
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Eminence Delta Pro 18 A in prism sealed 150 liters
here's what hornresp says for those two boxes

Click the image to open in full size.

and impulse - note 470uF cap flattening the passband

Click the image to open in full size.

Last edited by freddi; 31st October 2018 at 02:21 AM.
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Old 31st October 2018, 04:02 AM   #9
freddi is offline freddi  United States
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Eminence Delta Pro 18 A in prism sealed 150 liters
and effect of low loss series 600uF cap on the 300 liter sealed box

Click the image to open in full size.
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Old 31st October 2018, 10:38 PM   #10
academia50 is offline academia50  Argentina
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Quote:
Originally Posted by freddi View Post
here's what hornresp says for those two boxes

Click the image to open in full size.

and impulse - note 470uF cap flattening the passband

Click the image to open in full size.


Hello fedir

Thanks for these graphics, once again I appreciate your kindness....

I see many similarities between Win Isd and Horn Resp, I have not analyzed each one of them in depth, although in a quick glance I see a great difference in the movement of the cone.
Win Isd does not reach 2 mm (the red flat top line is 6.70 mm, driver spec)
I'm struck by that.

There can not be the possibility of having entered incorrect data?
Or that Xlim (15 mm) has been put in place of Xmax (6.70 mm) ?
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