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brians7

GSG Devastator

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I e mailed them Thursday.   Looks interesting. 

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Someone needs to buy one of these and test looks killer to me.

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29 minutes ago, rockhound said:

Someone needs to buy one of these and test looks killer to me.

Just need to get rid of my 684.

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I have 2 684 subs who is going to put them up for sale first 😀

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I'm sure it will go boom boom quite well. But its not a true horn. I'm still waiting for these guys to venture into true horn loaded subs. Even a flat pack of the F20 would be cool.

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Posted (edited)

Hi babadono,

 

While you are right that the Devastator cab is not a true horn in the eyes of many, what constitutes a true bass horn isn't actually well defined.

 

I've attached a couple of simulations that may be helpful in understanding this design.   Admittedly, simulations are not reality and measured results don't always conform to modeled results, but nonetheless they may be helpful in shedding some light on some key points, so here goes.

 

In the first simulation, the black line represents one model of the devastator cab--with its non-flared 'horn section' and ported rear section.  If we were simply to change the 'horn section' to have a flare that would make it look more like a traditional horn, the upper end shifts toward the light gray line.  Output above 90Hz rises, but at the expense of output below 90Hz.

On the low end, if the port is removed, output also falls.  Those two effects together give the light gray line.  Given that most folks who are running subs are looking for a good solution from about 20Hz to about 80Hz , we thought the design hit the target for that audience pretty well.

 

The second simulation shows the efficiency (again, just a model) of a 390hf-loaded F20 horn (top chart) and a devastator model (bottom chart).  the first efficiency peak occurs at different low frequencies owing to the different designs.  The F20 has its first efficiency peak at 20Hz, while the devastator having a ported rear section has an efficiency minimum at about that point.  Working up from there, both begin to rise in efficiency at 40Hz.  The intermediate drop in the devastator is much less that that of the f20 owing in part to the enormous motor that is on the driver.  Peak efficiency occurs at slightly different points, but overall the devastator seems to present a compelling efficiency case in the upper bass as compared with a traditional horn.  

 

All that efficiency translates into higher sensitivity too.  The devastator has about 6dB greater 1w1m (2pi space, power based on dc resistance of driver) sensitivity in the upper bass as compared with the F20 and with its much more massive driver has greater output capability across the entire bass range (about +6dB or so on the low end to about 15dB or more on the upper end depending on how much amplifier is put on it).

 

All this is in no way picking on the F20.  It is a good design and doesn't require as expensive of driver as the devastator.  I've recommended it to lots of folks. 

 

I suppose my point with all of this is to suggest that folks not get locked into specific definitions of subwoofers and what may or may constitute a particular configuration, but rather consider the performance characteristics of each against the target and choose the design that comes closest to hitting it.

 

 

 

1.png

2.png

Edited by LTD02
Found my shift key :-)
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Thanks for the heads up on the

Devastor...

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@LTD02 I meant no disrespect to you or your partners for the great work you are doing.

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On 7/16/2019 at 2:56 AM, billybob said:

Thanks for the heads up on the

Devastor...

 

No problem.

 

7 hours ago, CECAA850 said:

Thanks @LTD02

 

Do you have any frequency response graphs?

 

Shortly!

 

5 hours ago, Ceptorman said:

It sure is priced well at $495.

 

:-)  I'm not sure how long we are going to stay at these prices, but we don't have plans to raise them any time soon.  Mostly doing this to provide a resource for the guys who are stuck in between being able to completely DIY subs and those who have the money to just buy commercial solutions.  Well, we are also trying to create some interesting subs that might not otherwise come to market.

 

4 minutes ago, babadono said:

@LTD02 I meant no disrespect to you or your partners for the great work you are doing.

 

I didn't take it that way.  Several folks have asked what it is and there isn't a real clear answer.  :-)

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On 7/17/2019 at 5:21 PM, AHall said:

Man this design has me excited! 

 

Says the man with the monster Klipsch horn sub... 😁

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11 hours ago, Marvel said:

 

Says the man with the monster Klipsch horn sub... 😁

 

I’m feeling the need for more juice under 35hz. 

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I’m feeling the need for more juice under 35hz. 
Nothing wrong with more juice under 35hz. Feeling is believing.

Sent from my SM-G950U using Tapatalk

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@LTD02   i haven't been able to find the phyzical dimensions anywhere... how big it this?

 

Bruce

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6 minutes ago, Marvel said:

@LTD02   i haven't been able to find the phyzical dimensions anywhere... how big it this?

 

Bruce

They're on the site but just about the same dimensions as a 684.

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