You can ignore the math.
Figures 18, 19 and 20 are interesting.
Design is for 11-slit radial plug.
Read the conclusion.
http://www.nutshellhifi.com/library/...ngerine_PP.pdf
Last edited by mah; April 22nd, 2017 at 02:41 AM.
Opinion is only as valid as its verifiable supporting evidence.
It's the same conclusion many of us have drawn over the years. The Tangerine Phase plug was as much or more about cutting manufacturing costs than improving performance.
What i find most interesting is that it is all referenced to an 11 slit design when the actual production versions had 13 slits. Why?
GPA phase plugs have 11 slits.
Not all vegetables make good leaders.
Actual production used 11 slits ( I have 5 units like this ) / while Altec's printed copy has always mentioned 13 slits .
GPA's modified tangerines use 9 slits .
I looked at lots of pics on the www. and found that small format drivers have 11 slot plugs and large format drivers have 13 slot plugs. I don't believe that all of the small format drivers pictured were Great Plains products.
altec tangerine phase plug pics - Google Search
altec tangerine phase plug pics - Google Search
A bit of history: Tangerine prototypes and other stuff for sale
Last edited by mah; April 22nd, 2017 at 07:53 AM.
Opinion is only as valid as its verifiable supporting evidence.
Dammitt! Somebody stole 2 slits from each of my tangerines!
I KNOW i counted 13 slits in an orange tangerine. But, it must have been in a 288 or 291 although i would probably testify to the contrary. Just goes to show that eye-witnesses are not all that reliable. Add to that the fact that my one remaining brain cell is getting stretched mighty thin these days.
Not all vegetables make good leaders.
Clifford confirmed the 11 slot plug went into the production 802s. Time to check the '9' series, maybe.
The more, the merrier - Peavey: http://patentimages.storage.googleap...S6064745-2.png
Opinion is only as valid as its verifiable supporting evidence.
11 slots in my model 14 902's.
Not all vegetables make good leaders.
11 slits in my 802G's. 13 slits in my 291C's
I also think the tangerine was more of a cost cutting design than an actual improvement. I prefer my 802D's to the 802G's any day. I don't notice any loss is n HF extension with the 802D's
When I was looking for a pair of 604's I made sure to get the metal phase plug version.
I found an error in the math.....just kidding.
So the model predicts better performance. And measurements verify it.
Yet some folks don't hear or believe it?
I've listened to many examples of both and always prefer the tangerine phase plug versions.
Being less expensive to manufacture is a bonus. Of course sometimes they fall out...
Enjoying Altec Speakers since 1972
The performance is "different", no argument.So the model predicts better performance. And measurements verify it.
"Better" IMO, is a subjective observation at best, and i assume you're referring to the HF extension demonstrated in Cliff's paper.
The extension is a bit jagged, not nearly as smooth as the rest of it's range, and comes at the expense of a 2 db suck out in the more critical 6khz to 7khz range.
IMO, each design is better suited to certain applications, and you can see that Altec shifted the crossover points of the tangerine equipped systems much higher. Whether it has anything to do with the phase plug or not, you can definitely push the tangerine equipped systems harder before nasty sounds come out. I would tend to attribute it as much to the higher XO's.
Not all vegetables make good leaders.
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