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Old 15th November 2013, 08:13 PM   #381
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Originally Posted by xrk971 View Post
Run the mids open baffle (open frame drivers without rear chamber) on the synergy and you get a nice effect too. It helps to have a high Qts driver.
I'm going that route with mine. Chronicled in the thread "Monster Massive"

The dipole arrangement has a few advantages:

1) The sounds doesn't seem 'attached' to the horn. The horn disappears better.
2) It reduces the "I'm listening to a giant set of headphones" effect that you get with regular Synergy horns. (In a club or church, you *want* that effect, because it allows you to array them better, but at home, I like to minimize that effect.)
3) It's easier to build, easier to find midranges
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Old 15th November 2013, 08:40 PM   #382
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Originally Posted by gedlee View Post
I have heard some system with a big horn and big woofer that were simply awful, so I don't think that one can assume that combination will always be great.
Well of course you are right , but the thing is the vast majority if them have the potential to sound great. FWIW the more I learn from the design angle the more I'm certain that yours already do, and anything that I wish I could change about them is something that you would too if it were economically feasible. Case in point, I now know that a dedicated tweeter midrange is a complete mistake when using a compression driver in a home environment, with the headroom available there is simply no reason not to stretch it as far as the harmonic distortion component on a given horn with a given driver for a given spl will allow, and in a home as opposed to a theater or club that will be a LOT of headroom indeed! I'm so glad you are getting smarter E.G. I was concerned for you when I was younger and knew more.
I am The Audio Infidel..... I don't even tolerate my own BS.
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Old 15th June 2014, 01:52 PM   #383
frangus is offline frangus  Australia
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Originally Posted by peteleoni View Post
My thoughts?

Don't control reflections from a great speaker like that at all! For listening purposes? Instead create them! Go with your Synergy/headphone type design don't change a thing. Do this: Get another tiny set of full range speakers, (i.e minimus 7 et al) bandpass the living crap ( yes a very steep hump all middle) out of them and place them *behind* your Synergies facing into into the walls. Drive them (through separate cheap amp) with same signal or digital room sim and mix them in at only a few percent to taste.

Think I'm kidding? I'm not. Surround sound "reverb" sounds goofy as hell because of where it originates, this does not sound goofy at all, vastly natural in fact.
In fact, it is an improvement of what we already do in the studio, only we have to do it in the same dimension (same speakers) and you would be amazed at how much band passing is actually needed, I'm not even going to tell you, because a guy with your 'skillz" will figure it out very, very fast. the bose 901 crap had it backwards, the reverb tanks from decades past had it wrong, surround sound has it wrong now. I'm not guessing this I know it.
what is the purpose of band passing the rear firing set of speakers? What are the cut off frequencies?
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Old 21st November 2015, 05:06 PM   #384
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Hi Tom and Dr Geddes,

I know this is a very old thread, but did Tom have chance to visit Dr Geddes place ?
Just curious to know if we will see Synergy polars on Dr Geddes polar map software .

And Tom, I hope your home variant of SM60 (or maybe SM96 as they are 90 x 60) , which have much flatter response, are also sold someday...

Last edited by Hifisound; 21st November 2015 at 05:15 PM.
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Old 21st November 2015, 06:23 PM   #385
gedlee is offline gedlee  United States
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Nothing ever happened - sorry. I'm available, but the ball is in Tom's court.
Earl Geddes Gedlee Website
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Old 21st November 2015, 07:29 PM   #386
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Originally Posted by Hifisound View Post
Hi Tom and Dr Geddes,

I know this is a very old thread, but did Tom have chance to visit Dr Geddes place ?
Just curious to know if we will see Synergy polars on Dr Geddes polar map software .

And Tom, I hope your home variant of SM60 (or maybe SM96 as they are 90 x 60) , which have much flatter response, are also sold someday...
No i didn't get a chance to before i moved to Georgia, maybe i can next time i go north to visit my brother.

From the outset, we supplied the polar data in the two formats that are used in commercial sound design, EASE and CLF, the "common loudspeaker format" (the latter has a lot more than just polar data and many of the products are independently measured).

We also have the CLF data in the free "Direct" software we give away which is much faster than EASE for what most designers need for venue and stadium design jobs. Right now about half of the 100,000 seat plus stadiums have switched from line arrays to Synergy horns and several more will next season.

Right now there are a couple pairs of the home / studio sm-60 version and a well known studio in Memphis is installing some in a mix down suite but other than that, the home market is not attractive to the office in light of all the stadium work going on using the larger boxes.
Hope that helps
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Old 21st November 2015, 07:59 PM   #387
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Default Stadium systems

I must say the Jericho system at Spartan Stadium in East Lansing sounds great!
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Old 22nd November 2015, 10:16 AM   #388
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Hi Tom,

Any design, which is not sold currently , which you can release for DIYers ?
Maybe with crossover changes which result in flat response...
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Old 22nd November 2015, 03:50 PM   #389
Cask05 is offline Cask05  United States
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Hey Tom...

MST3K Successfully Crowdsources Its Comeback - Slashdot

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Old 23rd November 2015, 05:06 AM   #390
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Hello Dr Geddes and Tom,

I just realized one thing.
As Dr. Geddes has mentioned here

".....and just as clearly by 1 kHz we need to have the directivity well under control since, by this frequency, the ear is beginning
to get quite sensitive to reflections and timing aberrations......"

The above fact applies to normal listening rooms. I guess it doesn't apply to vast open spaces where synergy horns are used , right ?

Now my question is : Will the benefit of large synergy horns (and hence their very low pattern control ability) be diminished in normal rooms , due to this fact ?

Though I think one benefit of synergy horn may still be applicable, esp. the asymmetric ones.
Which is, the ability to have a narrower vertical pattern (than horizontal) but same vertical pattern control frequency as horizontal.
Something which is a tradeoff between elliptical and circular waveguides.

[Kindly forgive if there are some basic flaws in my understanding]
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