Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Eminence Delta Pro 18 A in prism sealed 150 liters
Eminence Delta Pro 18 A in prism sealed 150 liters
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 27th May 2019, 07:46 PM   #261
academia50 is offline academia50  Argentina
diyAudio Member
 
Join Date: Jan 2013
Do not be impatient, there are other prorities and first things first ...
  Reply With Quote
Old 1st June 2019, 08:13 PM   #262
academia50 is offline academia50  Argentina
diyAudio Member
 
Join Date: Jan 2013
I found this SPL calculator.

After entering the data of this project, the result is excellent, but a question arises here.

Within the values to be introduced, the sensitivity of the speaker refers to 1 W / 1m) but, and the gain or loss of the cabinet?
It is not the same a bass reflex, horn or sealed, correct ?

Thoughts ?
Attached Images
File Type: png Calculo SPL Eminence Delta Pro 18 A.png (218.1 KB, 68 views)
  Reply With Quote
Old 3rd June 2019, 03:36 PM   #263
David Morison is offline David Morison  Scotland
diyAudio Member
 
Join Date: Nov 2013
Location: Aberdeen, Scotland
Quote:
Originally Posted by academia50 View Post
I found this SPL calculator.

After entering the data of this project, the result is excellent, but a question arises here.

Within the values to be introduced, the sensitivity of the speaker refers to 1 W / 1m) but, and the gain or loss of the cabinet?
It is not the same a bass reflex, horn or sealed, correct ?

Thoughts ?
I think the writer of that tool expects this to be used for finished speakers with a flattish frequency response, thus one can expect there to be one sensitivity value that is a reasonable approximation of the whole speaker's response level.

Your project is a bit different in that you are accepting a loss in sensitivity as frequency decreases, so if I were you, I'd input whatever value corresponds to the expected sensitivity at the lowest frequency of interest rather than the nominal sensitivity which would only be relevant at higher frequencies. I thin that will be about 86dB for one speaker in your case.

HTH,
David.
  Reply With Quote
Old 4th June 2019, 01:41 PM   #264
academia50 is offline academia50  Argentina
diyAudio Member
 
Join Date: Jan 2013
Quote:
Originally Posted by David Morison View Post
I think the writer of that tool expects this to be used for finished speakers with a flattish frequency response, thus one can expect there to be one sensitivity value that is a reasonable approximation of the whole speaker's response level.

Your project is a bit different in that you are accepting a loss in sensitivity as frequency decreases, so if I were you, I'd input whatever value corresponds to the expected sensitivity at the lowest frequency of interest rather than the nominal sensitivity which would only be relevant at higher frequencies. I thin that will be about 86dB for one speaker in your case.

HTH,
David.


Sure help, thanks !

I will make the new calculations within the range I need, and upload them again.

I forgot the link, here goes :

Peak SPL Calculator
  Reply With Quote
Old 4th June 2019, 09:24 PM   #265
academia50 is offline academia50  Argentina
diyAudio Member
 
Join Date: Jan 2013
Well, here the final results, two subwoofers of 18 inches, sealed cabinets of 150 liters and located in two corners.
Listening point 6 feet (4 meters).
I have drawn a graph for a quick comparison of the SPL obtained at 20,30, and 40 hertz, with 1 Watt and 250 Watts ....
Attached Images
File Type: jpg IMG_20190604_175939.jpg (698.6 KB, 45 views)
File Type: jpg 20 hertz 76 DB 1 watt.jpg (198.2 KB, 41 views)
File Type: jpg 20 Hertz 76 Db 250 Watts.jpg (193.5 KB, 38 views)
File Type: jpg 30 hertz 84 Db 1 watt.jpg (199.0 KB, 38 views)
File Type: jpg 30 Hertz 84 Db 250 Watts.jpg (196.7 KB, 8 views)
File Type: jpg 40 hertz 89 db 250 watts.jpg (194.3 KB, 6 views)

Last edited by academia50; 4th June 2019 at 09:30 PM.
  Reply With Quote
Old 4th June 2019, 09:41 PM   #266
academia50 is offline academia50  Argentina
diyAudio Member
 
Join Date: Jan 2013
The rest ...
Attached Images
File Type: jpg 40 Hertz 89 Db 1 Watt .jpg (189.7 KB, 14 views)
File Type: jpg SPL 1m 1 watt.jpg (127.4 KB, 15 views)
File Type: jpg SPL 4 m 1 watt.jpg (125.8 KB, 15 views)
File Type: jpg SPL a 4m 250 watts.jpg (127.0 KB, 14 views)
  Reply With Quote
Old 5th June 2019, 04:47 AM   #267
academia50 is offline academia50  Argentina
diyAudio Member
 
Join Date: Jan 2013
Please, read:

40 hz 1 Watt , 92.80 Db at 6 ft.

I'm sorry, there was an error in the graph ...........
  Reply With Quote
Old 12th June 2019, 07:17 AM   #268
academia50 is offline academia50  Argentina
diyAudio Member
 
Join Date: Jan 2013
Quote:
Originally Posted by Lunchietey View Post
I built a fully braced tansmission line last week in 2 days(without paint time) and tested.
Well, we do not all have the same skills, congratulations for it !

Quote:
Originally Posted by Lunchietey View Post

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.

The idea is to go to more power with DSP if the result is not as expected.
That's why I'm building the strongest possible box.

Also, the resale value will be better, would you be interested ?
  Reply With Quote

Reply


Eminence Delta Pro 18 A in prism sealed 150 litersHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Two sub design options Eminence Lab 12 in 95 liters or Lab15 in 150 litres darkmatter Subwoofers 16 16th June 2018 04:34 PM
1st build: full range sealed for 4 liters zgtc Full Range 37 13th September 2017 11:32 AM
WTB: Eminence Delta Pro 12a Pollace Swap Meet 0 14th March 2015 08:19 AM
100 liters sealed. What sub driver goes the lowest?? jjkozlow Subwoofers 5 21st July 2005 07:14 AM
TC2+ in 60 liters sealed box ZACC Subwoofers 7 1st April 2005 05:00 PM


New To Site? Need Help?

All times are GMT. The time now is 08:55 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki