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-   -   Eminence Delta Pro 18 A in prism sealed 150 liters (https://www.diyaudio.com/forums/subwoofers/329267-eminence-delta-pro-18-prism-sealed-150-liters.html)

academia50 28th October 2018 10:27 PM

Eminence Delta Pro 18 A in prism sealed 150 liters
 
2 Attachment(s)
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 ! ;)

academia50 29th October 2018 08:48 PM

10 Attachment(s)
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.

academia50 29th October 2018 08:55 PM

1 Attachment(s)
....the last, power management.

academia50 29th October 2018 09:09 PM

2 Attachment(s)
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)

academia50 29th October 2018 09:16 PM

1 Attachment(s)
Here frequency response vs spl graph, of the 137 liters box and Q 0.707.

academia50 30th October 2018 01:09 AM

1 Attachment(s)
Quote:

Originally Posted by academia50 (https://www.diyaudio.com/forums/subwoofers/329267-eminence-delta-pro-18-prism-sealed-150-liters-post5586622.html#post5586622)
....the last, power management.



Power management was repeated, the missing graph is this :

Maximum SPL


I'm sorry :)

academia50 30th October 2018 09:57 PM

Quote:

Originally Posted by academia50 (https://www.diyaudio.com/forums/subwoofers/329267-eminence-delta-pro-18-prism-sealed-150-liters-post5586632.html#post5586632)
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 ? :confused:

freddi 31st October 2018 02:06 AM

here's what hornresp says for those two boxes

https://i.imgur.com/YrWH2IQ.jpg

and impulse - note 470uF cap flattening the passband

https://i.imgur.com/WhGtBQE.jpg

freddi 31st October 2018 04:02 AM

and effect of low loss series 600uF cap on the 300 liter sealed box

https://i.imgur.com/M5lAQyo.jpg

academia50 31st October 2018 10:38 PM

Quote:

Originally Posted by freddi (https://www.diyaudio.com/forums/subwoofers/329267-eminence-delta-pro-18-prism-sealed-150-liters-post5587901.html#post5587901)
here's what hornresp says for those two boxes

https://i.imgur.com/YrWH2IQ.jpg

and impulse - note 470uF cap flattening the passband

https://i.imgur.com/WhGtBQE.jpg



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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