The making of: The Two Towers (a 25 driver Full Range line array)

It still works for me... but I have an ancient browser in use. Internet Explorer 11.
I still use it quite often to go from one value to another.

Might it be the difference between European/American settings? Things like which decimeter to use etc.


I use updated versions of Chrome, Firefox, and Safari. I tried using the default settings at first as I'm trying to convert my brain to the admittedly more straightforward metric system. I still find myself converting metric into feet/inches in my head, though. I wonder if it's Java or Flash-based? Flash is going the way of the dodo and Java has intensified its default security levels over the years. Those have been known to cause outdated websites to fail on modern browsers.
 
I've had a few more listening sessions after my latest tweaks. This is a keeper, settings wise. I thoroughly enjoy what I have right now. Even if it is just some details that I changed, it works like a charm.

Perception is a strange phenomenon. Once you work your way around those first reflections you can really hear minute differences. It is a joy to listen to some tunes before I have to move on to work. I walk out of here with a big smile, still singing the tunes along the way. :)

On another note, the supplies to finish the subs are coming in slowly, it will still take a while though. Lots I still have to decide upon. Yesterday my damping feet came in. Due to the success of the damping feet with the arrays (I used industrial type damping feet for machinery) I ordered the same type, just a bit bigger in size as the subs are a lot wider. Basically they have a round sphere which gets pressed into a nylon piece and a rubber underside to avoid it slipping across the floor. They can take up to 600 Kg each (!).
 
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A little OT, but couldn´t resist:
Got this offer from Parts Express:
Dayton Audio CE Series CE32A-4 1-1/4" Mini Speaker 4 Ohm

Maybe a candidate for a cheap Line Source? I know they won´t play any bass, but a triangular enclosure with 4 side firing Mivoc AW2000 and 66 of these small <$ 2,50 drivers per side? A little too low sensitivity and power handling though..

Maybe a candidate for trying out this concept:
My New Line Array--It's a Modified CBT24

Or to go full tilt with my wet dream of an omni line source:
A 220 cm high tube with up- and down-firing subs inside (in the middle) of a hexagonal enclosure with 66 small units on each side. That is 396 units per side :eek::D Hate to wire these babies up though...
 
X-max, 0.5 mm, neh, I don't think these would make the cut.
There's not much open space (to breath) behind the cone either.

I've thought about a 3 sided or 5 sided array, with enough DSP you can make it do anything you want! From highly focussed (as cardoid) to complete Omni. Similar to what the Beolab 90 does.

But I'd like 5x (or 7x) arrays like I have now too, in it's own dedicated room with a big screen.
I think I'd rather have that than the 5 sided array.
 
You are probably right. Did the math on volume displacement on the hexagonal enclosure with 400 pcs CE32A vs 25 pcs TC9.
400 pcs CE32A can move max. 78 qubic cm air and 25 pcs TC9 can move 236 qubic cm air. That is more than 3 times in favor of the TC9s. Could still work with a subwoofer taking over around 100 Hz. I think I would deviate from the idea to make a cylindrical sub. inside the hexagonal as the distance horizontally between the CE32A´s would be too big and instead make the hex. enclosure as small as possible and that would be about 6 cm wide sides so the total width and depth of the hex. would be 10 cm.. :eek:. Very small indeed.. And then have four subwoofer towers in each corner of the room, floor to ceiling with , say , 4 pcs Mivoc AW2000 or AW3000 in each.

By the way you could make your 5x arrays as hexagonal omni´s ... That would be 2000 units :D

But I guess one should look for a unit with 1.5 mm displacement instead.
 
Not right now. I am too busy making my DAC to a 4 channel balanced DAC so I can build two floor to ceiling sub-woofers with 4 pcs Mivoc AW2000 per cab. placed in the front corners of my room, but later, who knows? I love the idea and I have heard what omni ( true omnis, not just dipols) , almost line arrays, can do . First of all the Mbl speakers, and one of my friends Ole Thofte, the guy responsible for the La Folia project, made an omni ribbon speaker, with a lot of issues (didn't play very loud, as there was phaseout issues) but the kind of spaciousness produced from these kind of speakers is awesome...
 
All this talk of Omni sources reminds me of the radial array Barleywater used to play with.

372946d1380045726-uniform-directivity-radial-woofers-jpg


I do miss Barleywater on the forums, I wonder what he's up to.
 
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Maybe this would be a better choice?
http://www.daytonaudio.com/media/resources/285-113-dayton-audio-ce30p-4-spec-sheet.pdf

It has a 1,1 mm max. displacement and a little more cone area. That comes out to 180 qubic cm total volume displacement for 400 pcs, almost the same as 25 pcs TC9 ...
And i guess the price could be around the same.

Why not look at the little Tectonic BMR 2" driver?
Great Xmax, flat FR, amazing dispersion, and better sensitivity than the ones you've shown.

https://www.parts-express.com/pedocs/specs/297-216--tebm35c10-4-spec-sheet.pdf
 
Why not look at the little Tectonic BMR 2" driver?
Great Xmax, flat FR, amazing dispersion, and better sensitivity than the ones you've shown.

https://www.parts-express.com/pedocs/specs/297-216--tebm35c10-4-spec-sheet.pdf

You are right. Much better driver. Unfortunately it is also almost 4 times as expensive. And if we are talking 400 units pr.speaker it is a lot... Well this is 2" so maybe we only need 250 pr. side, but that is still about $2000 pr. speaker :eek: compared to $800 for the small 1-1/4".
 
Long time!

Just thought id see if you were still at it. Apparently you are.

Good luck :)

Good to see you again, Jim, you beat me to it. Just today I was wondering how things were going for you. I never really stopped tinkering. However, these days I do remember the listening is at least as important as the tinkering! So lots of time goes up in smoke just enjoying myself that way :). I still have some things that I just need to try. The subwoofers being one of those projects.

How's your audio room doing these days?
 
Good to see you again, Jim, you beat me to it. Just today I was wondering how things were going for you. I never really stopped tinkering. However, these days I do remember the listening is at least as important as the tinkering! So lots of time goes up in smoke just enjoying myself that way :). I still have some things that I just need to try. The subwoofers being one of those projects.

How's your audio room doing these days?

The subs sound like a good move. Really hard (impossible?) to get a smooth deep bass response using mains only.

My audio room is basically the same as it was 2 years ago. Sadly, I barely have listened to anything lately. As it turns out, the tinkering is/was more interesting than listening in some ways. I always looked forward to how my favorite music could be improved as a listening experience. Some of this is due to there being virtually no new music I look forward to hearing. But that is another subject unto itself. That said, I miss my tinkering days.
 
Maybe that's why I don't dare stop tinkering :). The journey being a more enjoyable part than the destination?

I have thought about letting go of these tinkering projects I still do. In fact I remember me typing as much quite a while ago. I do not really need to do it to improve. What I have is certainly good enough (for me) to last me a lifetime.

However I do still enjoy this, as I still learn from it. I like the puzzle, but I also enjoy using my hands to build stuff. This way I still hear a lot of music, sometimes get queued into new music and I still do listen a lot and enjoy it.

I can relate to not finding all that much new music though.
I've always been somewhat like that, walking up to my Vinyl collection when I was young, staring at 400+ records and still being able to convince myself I have nothing worthwhile to play that day. In other words, a trip to the record store was in order.
I was late moving to CD's (late 80's) but continued buying lots of music (about 2 or 3 albums every week), but always on the lookout of getting more.
One day I came home from work and I had suffered a break in. My door was forced open and all my stereo equipment was gone, except for my loudspeakers (huge PA style, pretty heavy speakers). But all of my CD's were gone. The vinyl collection was still there. But that did change my buying habits for ever.
I was able to remember all of my CD's titles and artists by memory and the Police were able to retrieve about 70% of my disks, as I had been this thorough in my documentation of them. They ran into my collection by accident and recognised it as it was an exact fit to the list I gave them.
After that I still bought music, but never again at that same rate. The thrill was gone somehow.

Nowadays I do not find that much new music that really captures my attention. I usually find more of the oldies when I try. :)
 
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