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Old 16th April 2014, 05:00 AM   #1
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Default Pics new 4-way Azura horn system, plus BIG bass horn

Having built numerous projects including Tannoy GRF, Carfrae Little Big Horn, numerous Lowthers, GOTO, Altec and Klipsch...I'm now embarking on a radical new 4 way system, featuring:

Azura 340Hz horn and JBL 2445 drivers (with large 2 inch throat)

Eminence Lab12's 12-inch subs (2), with rear facing baffles for corner loading

Large new mid-bass horn taken from Martin Sneddon's design, plus tweaked...will be 1.5m tall, with mouth of 85cm x 85cm, and geature Altec 515 15-inch woofers.

Tweeter TBA, likely Azura 1,000Hz and suitable 1-inch compression driver.

Dual MiniDSP's to run the xovers.

Holton Precision Audio six channel power amp.

The Azura 340's are sounding very nice indeed....and I'm 70% through the build of the mid bass horns. The Lab12 subs are completed, and recently painted in mid gloss white to match the horns.

The mid bass horn upright tower section will be white, while the mouth is in Birch Ply, and I will leave natural colour.

xover points are:

Subs 20-90Hz
Mid bass 90-450Hz
Azura 340 horn 450Hz to 5,000Hz
Tweeter, 5k+

A really fun project...but a lot hinges on the mid bass horn for the true magic.

Andrew
Attached Images
File Type: jpg 340.jpg (86.5 KB, 1112 views)
File Type: png horn inside 3.png (500.3 KB, 1097 views)
File Type: jpg mouth bass horn.jpg (108.2 KB, 1051 views)
File Type: png sim.png (120.3 KB, 1027 views)
File Type: png bass horn drawing.png (312.4 KB, 1024 views)
File Type: jpg DSC_0303.JPG (187.3 KB, 349 views)
File Type: png painted cabs.png (493.9 KB, 246 views)
File Type: jpg ports in.jpg (95.7 KB, 278 views)
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Old 16th April 2014, 05:01 AM   #2
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Note - on mid bass horn drawing, it shows mouth as 85cm x 70cm...that is incorrect...it will be 85cm x 85cm.
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Old 16th April 2014, 08:56 AM   #3
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Man, that is some serious speaker-porn!
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Old 18th April 2014, 12:43 PM   #4
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Today I chamfered 6 pieces of ply to create a curved section near horn mouth.

Used fast drying glue for quick adhesion.
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File Type: jpg horn curve pieces.jpg (88.2 KB, 320 views)
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Old 18th April 2014, 03:46 PM   #5
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Old 18th April 2014, 10:56 PM   #6
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atilsley

I have seen some of your past builds and was impressed, however I don't see why you would build a mid bass solution that is much less efficient than your midrange horn even with using dsp.
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Old 19th April 2014, 12:16 AM   #7
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What drivers are you using on the Azura?
Would like to see actual measurements if possible on the 340 wide open... no xover.

hottattoo, I think that is why they invented bigger amplifiers?
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Old 19th April 2014, 12:30 AM   #8
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Quote:
Originally Posted by hottattoo View Post
atilsley

I have seen some of your past builds and was impressed, however I don't see why you would build a mid bass solution that is much less efficient than your midrange horn even with using dsp.
Thanks.

The build of the mid bass horn is mainly around the dynamics and scale such a horn delivers...plus I simply like large horns...!

Efficiency wise, not an issue. With altec 416 or 515, I'll have 100db...with small adjustment on minidsp, this will work fine with azura.

Azura is being used with JBL 2445 at the moment.

I'll submit a recording of another 340 I had with selenium one inch driver....remarkably flat for a cheap driver and relatively cheap horn.

The two inch throat 340 provides more attack...and I'm currently crossing this at a low 450hz.

Mid bass horn especially designed to cover 100hz to 500hz....which is the very critical range.

Martin Sneddon of azura has same type of horn, and puts this way ahead of his other horns, eg the big 160 model. It was his comments that made me decide to go down this fun path.

Plus, I'm a builder and creator...!
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Old 19th April 2014, 01:26 AM   #9
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atilsley;

You cant.t go wrong with the Altec 515. I use the 515b and found it to be the best for mid bass duty. Your system should sound great when complete !!!
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Old 19th April 2014, 02:13 AM   #10
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Quote:
Originally Posted by hottattoo View Post
atilsley;

You cant.t go wrong with the Altec 515. I use the 515b and found it to be the best for mid bass duty. Your system should sound great when complete !!!
Thanks...I've spent a few years working it all through...and have built many systems using 604's, 416's, my own made Yuichi 290Hz horns, Tannoy GRF horns, GOTO bass horns etc.
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