2 way woofer + Horn PA - who first? - diyAudio
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Old 23rd July 2010, 04:05 PM   #1
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Default 2 way woofer + Horn PA - who first?

I wanted Altec Voice of Theaters, never could afford them if I did see some for sale. Saw Peavey SP5 on a website, went to the store, heard them, liked the SP2 better because the 15" woofer give better bass. The SP2 has a 2" piezo driven plastic horn, a 15" woofer, and a 1200 hz crossover. I love the sound, especially on top octave piano. Now I find out there are 6 or more vendors selling this design, although some have a smaller piezo driver. Yamaha, Mackey, American Audio, Electrovoice, all have versions of this design. There must be a lot of people that like it. I know some keyboard players on organforum.com are using different brands.
So who was first to do 15" woofer + piezo horn? I include some pictures gleaned from craigslist or peavey. Here is the primitive looking SP1.http://www.diyaudio.com/forums/attac...1&d=1279897280 Here is an early SP2http://www.diyaudio.com/forums/attachment.php?attachmentid=181361&stc=1&d=1279897 280 Here is a modern production SP2 http://www.diyaudio.com/forums/attac...1&d=1279897280
I've got some really old Peavey T-300 High Frequency Projectors, which are 2 10" woofers and three piezo drivers installed in a fan shape. They sound good on high piano, but there is a very small sweet spot where the highs are focused. The SP2-XT has highs spread all over the room, and the peavey literature discusses a patent where the sound is focussed down from the speaker stand to people's heads. Works great in my living/dining room.
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File Type: jpg SP1dryridgeKy.jpg (6.6 KB, 402 views)
File Type: jpg OldSP2Cincinnati.jpg (6.3 KB, 374 views)
File Type: jpg PeaveySP2front-00586500_8438.jpg (28.9 KB, 398 views)
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Last edited by indianajo; 23rd July 2010 at 04:16 PM. Reason: define term "first"
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Old 30th July 2010, 03:59 AM   #2
Pano is offline Pano  United States
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Are you sure those are piezo horns? Aren't they standard 1" throat compression drivers?


12" woofer + 1" compression driver on a horn is a very standard PA device. The origins go back to the 1930s or so.
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Old 30th July 2010, 01:57 PM   #3
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Quote:
12" woofer + 1" compression driver on a horn is a very standard PA device.
and now a standard DIY option
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Old 30th July 2010, 02:19 PM   #4
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And a darn good one, too!
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Old 30th July 2010, 02:43 PM   #5
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Don't know 'who was first' with this kind op setup, but for home use I think this is a very nice project;
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Old 30th July 2010, 03:09 PM   #6
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The earliest I'm aware of is Bell Labs/W.E. 50 Hz 'full-range' horn perched on top of an 18" OB from the 1920s used primarily in cinemas. This particular dual system has super tweeter horns mounted near the top of the OB:

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Old 30th July 2010, 03:15 PM   #7
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A single 18", 300 Hz horn for smaller venues, PA, large HT:

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Old 30th July 2010, 03:23 PM   #8
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Thanks for the answers. No, I'm not sure the horn driver is piezo, although some quoted text about another brand said it was 1.75" piezo. Beautiful pictures.
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Old 30th July 2010, 03:28 PM   #9
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They aren't piezo. They are standard compression drivers.

If you search the forum for "Econowave" you'll find a very nice project by Zilch using a 12" and horn. I use 15" to big horn myself. I have not found that a 15" and 1" compression driver match very well. But there may be exceptions.
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Old 30th July 2010, 03:52 PM   #10
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The 'modern' point source driver ('full-range', woofer, etc.) was invented in 1925 with the earliest 'modern' horn/reflex speaker AFAIK being a 1930 Bell Labs/W.E. 12" 'full-range'/800 Hz multi-cell design (can't find a photo ATM) that was quickly replaced with a cast alum. radial horn, then in 1936? a 15" woofer with a new 800 Hz multi-cell that remained in production with various horn, woofer models till the end of the 1970s ('80s if you include the Model 19) as the JBL/Altec Iconic, Valencia, 800 Hz Voice of the Theater in both pro and consumer versions. (JB) Lansing Manufacturing's version that would dominate after being bought out by Altec: http://www.lansingheritage.org/image...942/page07.jpg

The Bell Labs/W.E. design would be resurrected after the Korean War and last through the '80s with various woofer models as the A8: http://www.lansingheritage.org/image...vott/page4.jpg

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