Eminence Delta Pro 18A - is it what it claims to be? - diyAudio
Go Back   Home > Forums > Loudspeakers > Subwoofers

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 29th April 2010, 01:55 AM   #1
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
Default Eminence Delta Pro 18A - is it what it claims to be?

A friend of mine needs a portable PA, and this looks like a pretty suitable option for bass. A quick ISD sim shows them with an F3 of about 40hz in 2' cubed ported boxes, which is in this case probably good enough. Does anyone have any comments?
__________________
I WANT TO BUY SOME W22EX001s. PM me if you have some for sale!
  Reply With Quote
Old 29th April 2010, 04:48 AM   #2
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Hmm, for a ~40 Hz half space F3 I get ~10 ft^3/42 Hz Fb with WinISD Pro. A prosound alignment OTOH is ~4.93 ft^3/28 Hz Fb/~65.5 Hz F3 with a 6" dia. x ~15.33" long vent and Xmax limited to ~270W.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 29th April 2010, 04:59 AM   #3
diyAudio Member
 
Moondog55's Avatar
 
Join Date: Jun 2007
Location: Norlane; Geelong: Victoria: Australia
Hmmm?? 2 foot cubed equals 8 cubic feet, won't we be glad when simple scientific notation is included in messaging programs.

But for an 18 inch woofer a cube only 2 foot on a side sounds small ( I am assuming that this is internal )
__________________
QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"
  Reply With Quote
Old 29th April 2010, 05:26 AM   #4
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
Bummer, I 'saw' what I expected to see, 2 ft^3. Tuned to ~42 Hz, 8 ft^3 is close enough to a 42 Hz F3 and VC heating will flatten it out.

GM
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 29th April 2010, 05:31 AM   #5
diyAudio Member
 
Join Date: Jan 2006
Location: Wisconsin....what did you expect?
Send a message via AIM to Spasticteapot
Quote:
Originally Posted by GM View Post
Bummer, I 'saw' what I expected to see, 2 ft^3. Tuned to ~42 Hz, 8 ft^3 is close enough to a 42 Hz F3 and VC heating will flatten it out.

GM
That's what I thought.

You'll pardon my lack of ISD Pro (I'm running on a Macintosh ATM), but for a 40hz F3, what will excursion limit my output to? This is perhaps not the most ideal driver for a subwoofer, but it is quite cheap
__________________
I WANT TO BUY SOME W22EX001s. PM me if you have some for sale!
  Reply With Quote
Old 29th April 2010, 05:43 AM   #6
GM is online now GM  United States
diyAudio Member
 
GM's Avatar
 
Join Date: Jun 2003
Location: Chamblee, Ga.
~124 dB/m/60 Hz/300 W.
__________________
Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.
  Reply With Quote
Old 29th April 2010, 05:56 AM   #7
diyAudio Member
 
Moondog55's Avatar
 
Join Date: Jun 2007
Location: Norlane; Geelong: Victoria: Australia
Quote:
Originally Posted by GM View Post
Bummer, I 'saw' what I expected to see, 2 ft^3. Tuned to ~42 Hz, 8 ft^3 is close enough to a 42 Hz F3 and VC heating will flatten it out.

GM
Always glad to be of help ( it doesn't happen very often tho )
__________________
QUOTE" The more I know, the more I know, I know (insert maniacal laugh >here<) NOTHING"
  Reply With Quote
Old 29th April 2010, 10:41 AM   #8
diyAudio Member
 
Join Date: Jan 2005
Location: Rotterdam, NL
Cubo 15 The 18" version of this 15" cabinet is suited for the Eminence Delta Pro 18, it's tried and tested with that specific driver.

Regards Johan
__________________
Impossibilities we do immediatly, miracles take slightly longer.
  Reply With Quote
Old 29th April 2010, 01:45 PM   #9
diyAudio Member
 
Josephjcole's Avatar
 
Join Date: Jun 2004
Location: Wisconsin
Quote:
Originally Posted by Spasticteapot View Post
That's what I thought.

You'll pardon my lack of ISD Pro (I'm running on a Macintosh ATM), but for a 40hz F3, what will excursion limit my output to? This is perhaps not the most ideal driver for a subwoofer, but it is quite cheap
Just as an aside Unibox is a nice program (free) that runs on excel. It's what I use on my Mac. It will model excursion.
Joe
  Reply With Quote
Old 2nd May 2010, 02:38 AM   #10
diyAudio Member
 
sumaudioguy's Avatar
 
Join Date: Jan 2010
Location: Midwest U.S.A.
One thing that won't work is that small port. The port will go into power compression long before 123dB is reached at 40Hz, My "educated" guess is 112dB will be about as loud as the port will go at 40Hz.

How about a sealed box of 8 cubic feet and this woofer?
Parts-Express.com:Eminence Sigma Pro-18A-2 18" Cast Frame Driver | sigma pro-18a subwoofer 18" subwoofer pa subwoofer 18" driver
This will produce about 121dB at 40Hz in reality and 200 watts of drive~ 40 volts.

Small ports still don't work! A port absolutely needs to have a minimum size of 1/3 the area of the driver so for a typical 18 that means AT LEAST a 9 inch round port. Half size is much better which is just over an 11 inch round hole.

Please do not make the port to small.
__________________
What the other guy said----Standing on the shoulders of giants.
New avatar- no more little array
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
FE207E + Eminence Delta 12 LF larkinrulez Full Range 22 18th January 2009 05:28 PM
Eminence Delta B 8 inch driver BudP Multi-Way 1 29th April 2008 11:56 AM
Eminence Delta 12LFA is 10 ohm nom?! geminni Subwoofers 2 11th July 2007 06:49 AM
FS : pair of Eminence Delta 10" ***LOWERED PRICE*** punk Swap Meet 1 12th July 2006 03:08 AM
FS : pair of Eminence Delta 10" woofers punk Swap Meet 0 9th July 2006 06:52 AM


New To Site? Need Help?

All times are GMT. The time now is 02:47 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2