Plans for Alfredo Horn from Alf Lepp

fito

Member
2009-06-15 11:43 am
Hello,

I found a few comments on the "Alfredo" horn, a back-loaded Tractrix horn designed by Alf Lepp from Australia.
But I wasn't able to find the plans for it or to find conact dates or homepage fof Alf Lepp.

can anybody help me

many thnaks and regards

Thomas
 

tb46

Member
2006-01-09 7:04 pm
Texas
Hi,

Not the best resolution, maybe somebody has something better.

Regards,
 

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fito

Member
2009-06-15 11:43 am
Oliver, many thanks

it gives me an idea of the speaker; maybe somebody has ab better plan to be able to build it.

Does anybody have experience with this speaker?
I am looking for horn cabinets for Lowther PM2C (old version with new cones cones from Stefan Stamm)

best regards
Thomas
 

fito

Member
2009-06-15 11:43 am
Hello Leon,

many thanks for it.
Does anybody has built or heard the Alfredo horn? What is the lowest response frequence? I'm looking for a horn that has deeper bass frequence than my Acousta 115 horns. And the Alfredo horn ist not significantly lager so I dout if it really goes much deeper.

regards
Thomas
 
The Alfredo reaches down to 60Hz, in good quality bass.
I'm redesigning it for a double mouth structure (twice as large!!) for higher spl in the bass.
Will not go deeper!!
You will get deeper bass from the "big fun horn" (corner loading) and the "Mau horn".
"Small horns", like the Alfredo, seldom go deep, use a "high-speed"sub.
 
Hi everyone, I just noticed these posts and that there have been a number of comments about the Alfredo Horn and trying to contact Alf Lepp. I note that they are a year old, so you may not pick this up.

First the bad news, Alf passed away around 5 years ago. He lived a long life and was a brilliant engineer and craftsman. One of the greatest. I had the pleasure of growing up across the street from him and build loudspeakers with him for over 20 years. I have no doubt that Alf would be absolutely thrilled to hear that some of his designs are being discussed long after he was gone.

Now the news about the Alfredo Horns. I don't have any additional plans, however, they are currently sitting slightly wounded in my garage. As tends to happen with Lowther's one of the foam surrounds has decayed and cracked in one place. I can confirm that they average around 96 - 97db @1w/1m and like any other lowther that I have seen measured they were pretty bumpy above 5 kHz. While the measuring system we used wasn't the best below 100Hz, they were pretty useful down to about 50Hz. They used a Lowther PM6A Silver Speech coil unit.

I have attached a photo. Hope it is of interest to you.

Regards

Peter
 

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Certainly of interest. I have print-outs of the "wrong" alfredo horn, the one with both front and rear loading and they're about 12 years old. It helped feed my interest in horns. Good to hear some background about the designer.

The "right" alfredo horn looks great. The front is mostly mouth, like it should be. Doesn't look too complicated to build, either.
 
If anyone is planning on building this horn the plans posted by Dave (post 13) are very close to scale...enough to build them. I blew up the plans, printed and started measuring the given dimensions. The most variation I could find was 4 mm. Most of the lengths were right on or a mm out.

If anyone out their does find the dimensions please post them.

Also, any info on the commercial rights?

Thanks
Sean
 
If anyone is planning on building this horn the plans posted by Dave (post 13) are very close to scale...enough to build them. I blew up the plans, printed and started measuring the given dimensions. The most variation I could find was 4 mm. Most of the lengths were right on or a mm out.

Sean,

I have no more than i have posted already. Someone will need to redraw the plans from the picture, keeping the known dimensions the same and deriving the rest.

dave