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Old 30th July 2010, 03:01 PM   #11
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Quote:
Originally Posted by panomaniac View Post
I have not found that a 15" and 1" compression driver match very well. But there may be exceptions.
In what way(s)? I mean it depends on both the woofer's and horn's specs, so it's admittedly pretty easy to get a poor performing combo. The Altec M19 is considered by many to be the best overall sounding of the classic combos and the Geddes Summa easily outperforms it.

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Old 30th July 2010, 03:11 PM   #12
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I suppose that was mostly in pro applications. The 1" driver is crossed high to protect it. To my ear it doesn't mate well with the 15" woofer. A 10 or 12" woofer, yeah, sounds much better on vocals, especially.

But for domestic use it can work, true enough. Even I've done it. =) Usually need a big horn tho. Like the 811 cited in your examples.
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Old 30th July 2010, 04:08 PM   #13
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Yeah, just look at how large the folded horn is to get a 1" to play low at high SPL and even then they had to use multiple horns with up to four drivers each for the really large venues just to spread the mono signal around the room. Even ~108 dB eff. horns can only do so much when limited to 8 W/driver.

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Old 31st July 2010, 01:07 AM   #14
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Originally Posted by indianajo View Post
The SP2 has a 2" piezo driven plastic horn, a 15" woofer, and a 1200 hz crossover.

So who was first to do 15" woofer + piezo horn?
Hmm, missed the piezo part. Don't know, though I first saw them in '50s era Motorola HIFI consoles. Still have a pair of 700 Hz cut-off/1200 Hz XO horns with large screw on piezos. I don't recall Peavey using the driver, but they were considered as strictly entry level rigs when they first hit Hotlanta in the mid? '60s. I remember trying to listen to a large (for the time) array at Rhythm City, but they were so shrill at high SPL that I had to make a hasty retreat, so may very well have been piezos. Mostly, I remember the crude fiberglass horns looking like they'd been made from a back poured JBL.

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Old 31st July 2010, 03:38 PM   #15
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Quote:
Originally Posted by GM View Post
Hmm, missed the piezo part. Don't know, though I first saw them in '50s era Motorola HIFI consoles. Still have a pair of 700 Hz cut-off/1200 Hz XO horns with large screw on piezos. I don't recall Peavey using the driver, but they were considered as strictly entry level rigs when they first hit Hotlanta in the mid? '60s. I remember trying to listen to a large (for the time) array at Rhythm City, but they were so shrill at high SPL that I had to make a hasty retreat, so may very well have been piezos.

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Well, that just proves to me that speaker performance has a lot more to do with testing and quality control than it does with basic design. These SP2-XT's are not shrill at all, the best sounding speakers I've ever owned. Better than anything the church has bought. Thanks for the history GM, if any VOT's were ever sold here used they were quickly moved out to a bigger city where people can afford to spend some real money for them. We don't even have a boutique hi-fi shop anymore, just big box retailers and musician supplies.
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Old 31st July 2010, 03:48 PM   #16
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Indiana, you don't have piezo tweeters. That's why they are not piezo shrill. You have standard compression drivers.
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Old 31st July 2010, 04:33 PM   #17
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Hmm, my 'piezo' comment pertained strictly to the early horns I tried to audition. Later horn drivers as early as the '70s definitely had bone-fide compression drivers, though to my ears they were at best on a par with Altec's IMO horrible 807 Symbiotik drivers, but at least they were a lot cheaper. Can't comment on more recent drivers.

Fortunately, I see Peavey now has an archive of sorts: http://www.peavey.com/assets/literat...uals/sp2xt.pdf

I take issue with just how 'silky smooth' its Ti diaphragm is though as even JBL's best sounds like aluminum being ripped at high SPL if not damped with a mist coat of Dammar.

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Old 31st July 2010, 11:57 PM   #18
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Those early 2 piece SP2's in the picture at start post may be the shrill ones you are talking about hearing in 1970. They only sell for about $200 a pair. Whereas the SP2-XT is pulling about $300 each used, and SP2G with the speakon connector is getting $150 less than retail at about $450. Thanks again. Will look at the archive, have been to Peavey's site about the new model but didn't figure out that feature on the older ones. I did actually hear a VOT setup once in a theater in 1967, our band director told us to go have a listen. I heard them on Lord Jim movie, which had an indonesian gamalong orchestra soundtrack. Interesting and pleasant, but I had no live experience with those instruments to know what they really sound like.
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Old 1st August 2010, 02:12 AM   #19
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Assuming the bass horns are FH1, I've suffered their excessive delay on many occasions, but the HF horn was a more abruptly terminated radial with no mounting flange, only glassed in metal mounting tabs to mimic the tabs on Altec sectoral horns, but I can't remember the JBL model it appeared to be a clone of and the stack was high enough that I couldn't see the HF driver.

The drivers I've seen though looked like some cheap EVs I've seen which in turn was offered as an Altec IIRC after being bought out by them, but I can't find the right info ATM.

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Old 1st August 2010, 03:26 AM   #20
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Quote:
Originally Posted by indianajo View Post
I heard them on Lord Jim movie, which had an indonesian gamalong orchestra soundtrack. Interesting and pleasant, but I had no live experience with those instruments to know what they really sound like.
They are quite strange and wonderful, I can assure you.
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