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Multi-Way Conventional loudspeakers with crossovers

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Old 30th September 2008, 07:13 PM   #4481
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Default The AH-425's are done


Just got this e-mail from Martin Seddon - the AH-425's are done. Approximate dimensions are 262mm long, 418mm overall diameter, and 135mm diameter for the flange. The portion of the horn that rests on the carpet (where the walls are 90 degrees to the axis) is about 350mm across.

The LeCleac'h T ratio is 0.707 (this value of T came out of on-going research being done by Bjorn Kolbrek - results so far show that results for 0.707 and 0.8 are pretty similar).

The similarity to the effective horn inside a 15" Tannoy is not entirely an accident, since this design adheres to the Newell and Holland design criteria of minimum coloration for horns.

The three larger holes in the flange are drilled for the GPA & Altec 288, 290, 299, and 399 mounting studs (which are supplied with the driver).
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Old 30th September 2008, 07:19 PM   #4482
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Very saxy.
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Old 30th September 2008, 08:36 PM   #4483
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"Just got this e-mail from Martin Seddon - the AH-425's are done"

Finally!!!
Mine have no.2

C.
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Old 30th September 2008, 08:52 PM   #4484
agent.5 is offline agent.5  United States
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#3 here.
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Old 1st October 2008, 06:27 AM   #4485
Salas is offline Salas  Greece
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Fantastic finish! And the color very nice. Art objects. But I don't dare ask the price, or Dr. Geddes about the profile choice.
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Old 1st October 2008, 06:44 AM   #4486
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The price is extremely modest considering what you're getting - about AU$600 a pair, and postage about AU$90 a pair (two of them pack into one box, and they are not fragile). Wood horns are many more times expensive, and the Music Concrete horns about double - and shipping a pair of concrete horns from France to the USA isn't that cheap.

The dimensions of the AH-425 are bounded by the maximum length quoted by Newell and Holland, as well as the largest allowable box that AusPost will ship. Shipping from Oz to the USA using UPS or FedEx is much more, starting at $600 on up. Other dimensions are set by the 8-degree throat of the GPA/Altec drivers, along with the results of Bjorn Kolbrek's simulations and measurements.

In short, it is tightly optimized for a 1.4" large-format compression driver and a 700 Hz ~ 1 kHz crossover. The intended complement on the LF end is a 12~15" direct radiator or an AH-160 or AH-204 Azurahorn with 5~7" high-efficiency driver - Lowther, AER, Feastrex, or a professional midrange driver.

Three different audio-enthusiasts in the Denver area are using the larger Azurahorns with Lowthers and AERs, and they're getting very very good results with them. If I get results midway between Azurahorn/AERs and Altec 288's with 1505 multicells, I will be very pleased.
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Old 1st October 2008, 07:10 AM   #4487
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"Fantastic finish! And the color very nice. Art objects."

pics of a 550 horn with extension for goto drivers from Martin.
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Old 1st October 2008, 07:11 AM   #4488
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second one.
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Old 1st October 2008, 07:24 AM   #4489
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As you can see, Martin does good work - and the LeCleac'h sonics have nothing to apologize for. Despite what the polar curves imply, in reality the LeCleac'h profile is very spacious sounding, akin to a 1505 multicell but a lot more coherent-sounding.
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Old 1st October 2008, 09:15 AM   #4490
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Quote:
Originally posted by caninus80
"Fantastic finish! And the color very nice. Art objects."

pics of a 550 horn with extension for goto drivers from Martin.

Oooh, where did you get the Goto adapters from? I have the 550s (I originally comissioned them from Martin for Vitavox S2s, with a 1.5" throat) but would like to try them with my Gotos....
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