Eminence Delta Pro 18A - is it what it claims to be?

Spasticteapot · 29th April 2010, 01:55 AM

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?

GM · 29th April 2010, 04:48 AM

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

Moondog55 · 29th April 2010, 04:59 AM

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 )

GM · 29th April 2010, 05:26 AM

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

Spasticteapot · 29th April 2010, 05:31 AM

Quote:

Originally Posted by GM

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

GM · 29th April 2010, 05:43 AM

~124 dB/m/60 Hz/300 W.

Moondog55 · 29th April 2010, 05:56 AM

Quote:

Originally Posted by GM

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 )

Rademakers · 29th April 2010, 10:41 AM

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

Josephjcole · 29th April 2010, 01:45 PM

Quote:

Originally Posted by Spasticteapot

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

sumaudioguy · 2nd May 2010, 02:38 AM

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.

29th April 2010, 01:55 AM	#1
Spasticteapot diyAudio Member Join Date: Jan 2006 Location: Wisconsin....what did you expect?	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!

29th April 2010, 04:48 AM	#2
GM diyAudio Member 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.

29th April 2010, 04:59 AM	#3
Moondog55 Dilletante, tinkerer and beggathoner supreme diyAudio Member 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"

29th April 2010, 05:26 AM	#4
GM diyAudio Member 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.

29th April 2010, 05:43 AM	#6
GM diyAudio Member 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.


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29th April 2010, 10:41 AM	#8
Rademakers 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.

2nd May 2010, 02:38 AM	#10
sumaudioguy diyAudio Member 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

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