dak wrote: ↑Sat Apr 23, 2022 3:12 pm
ka7niq wrote: ↑Fri Apr 22, 2022 2:46 pm
The question I have is HOW does Peavey get such flat response out of the SP3 ? LOL, the frequency response graph in the Peavey Literature looks almost like a straight line! Very Impressive!
Well, look at
this whitepaper, the bottom section about constant directivity horns. The SP3 uses a specific frequency crossover that
- employs the bass speaker as part of the highpass circuitry for the horn driver, resulting in higher steepness at the cost of being specific to one bass speaker
- attenuates the horn response at lower frequencies with a custom autotransformer that is different for every speaker combination/enclosure
- uses components of custom values for every separate speaker model
So there is really no point in, say, replacing the bass speaker with a "better" one. And this is a speaker that is pretty good even off-axis as opposed to speakers with more directive horns.
So the "flat response" is not an accident but a consequence of engineering the frequency crossover to make for such a flat response, including components and a design that is kind of unusual to see in typically more generic crossovers.
What I still dont understand is, how does Peavey get such a nearly ruler flat response out of the SP3, when the Peavey 22A driver in that Horn shows a big broad peak from 2 to 4 K ?
The Peavey SP3 uses the same horn and driver as my speakers, and also crosses over at 800HZ.
Ya think maybe that Peavey is Lying to us about the response of the SP3 ?
If you ever get the chance, look at the Peavey Spec Sheet on a SP3.
It shows nearly ruler flat response, clear out well past 10K!
This has got to be a Lie, because not only does the Peavey 22A driver have a well known broad peak from 2 to 4 K, but it also does not play well out in frequency either!
Yet Peavey shows the SP 3 with nearly ruler flat response, well out to nearly 20K!
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