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Discussion Starter #1 (Edited)
I've been working on a semi full range combination of two EL70's plus some bass reinforcement with SDX7's. The EL70's are great but when you really want to crank it up as is concert level steroe or a great movie you need more help than the two EL70's.

So here is the start of the monster. SDX7's are flat to 30hz. Max SPL within excursion limits:

30 watts power input for all pics.










The EL70's will have their own sub enclosure. They will be an almost perfect match to the two SDX7's. So you get the sweet sound of a good full-range with the umph of a decent bass horn.

Will post pics as I have it built.

Mark
 

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Discussion Starter #3
Hi Mike

Sure ask good questions!

Width 9" Depth 18.5" Height 34"

Floor standers with the horn port to the back. All the sound tailoring in the world should you car to move about a little here and a little there.

Mark
 

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Discussion Starter #4
I was reading the SDX10 thread when I got to thinking how loud could the low end of this speaker go?
So a bit of fooling in the simulator and Voila:



150 watts input. So if you go Bi-amped this box can really rock.



Still within X-max. If you have a high pass filter you can even go a little louder than this. Not to bad for just under two cubic feet.

Mark
 

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Discussion Starter #6
These numbers are for wall floor junction or two reflections ( wall + floor ). If you go to a corner with a third reflection ( wall + wall + floor ) you can add another 3 db.

Mark
 

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Care to post up the parameters for these horns? What are we talking about here TH designs? The simulated responses look pretty good if so.
 

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Discussion Starter #8
Care to post up the parameters for these horns? What are we talking about here TH designs? The simulated responses look pretty good if so.
It's really a double tapered quarter wavelength resonator. A fancy name for a shape like two funnels spout to spout. If you balance everything out you get pretty good response. If you tap a second driver at the right place it works even better.

I'll post some thing tonight. Still have work to do.

Mark
 

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Discussion Starter #9 (Edited)
As promised the input screen from Hornresp.



If you have the program mess with it a bit. It really is quite interesting.



Here is one way it can look.



As for completion. I've drawn it out full scale but I have a client that wants something else done. SO first things first.

Mark
 

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Discussion Starter #10
Hi guys I'm still working to make a living this week and the project unfortunately has to go on the back burner until next week. Next week I'm in the shop all week and I will have time to get this up and running. Sorry for the long wait.
 

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Discussion Starter #11
I've been working on the design all weekend along with some others. Will post pics and descriptions tonight.

Mark
 

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Discussion Starter #13
Hi Steven

This design has been taking me a great deal of time. The horn section has been worked on for over 120 hrs to date. The fold is the hardest part with this unconventional shape. But I think I have licked it. Had a cold bug over the weekend and now I have a couple of days of work before I can put the finishing touches on the bass section. Once that is proven I will plunk in the EL70's I have no questions as to how they sound. Bare with me this will be a pretty good box.

Mark
 

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Discussion Starter #16
Working on it. Been crazy busy in the real world trying to make a living. My daytime job alternates between fine cabinet making and general construction. More of the latter than the former as of late. What I want to do gets knocked out of the ball park all to often by the realities of being an evil genius ( LOL ) MONEY! If only I could figure how to mass produce the money all my problems would be solved! I think that may be a little on the illegal side of things though.

But I have some time this week to get things done. On the block is the bass section of this speaker. It is almost ready. Then there is a 4 driver EL70 Bi-Pole surround. After that there is a computer speaker system with 2 EL70 per cabinet in a 7 liter configuration plus a more or less conventional sub-woofer. So busy I am I am.

When I have something to post I will do so mucho pronto!

Mark
 

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Discussion Starter #18
Not dead yet!

Bass section to be tested is going together today and I will be able to test something or the other tomorrow.

High section is a snap.

Mark
 

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Discussion Starter #19 (Edited)
Ok gents a bit of an update. The low end of the design is almost ready for testing.

Here are the specs::reading:



Mark
 

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Discussion Starter #20
Well gents the tests on the concept design have passed with flying colors and this one is next batter up.

Problem is now I have to make a set for my Dad! See what happens when you let people listen to good sound. It is contagious!

The box will be a slimish tower design around 42 inches tall. The height is there so that when you sit down you have the fullrange drivers on axis with you ears. Makes for the best image presentation from the recordings.

Can't wait to put it through it's paces.

Mark
 
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