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LaScala Horn dispersion?


lifter

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If you want to get the best performance from a La Scala or La Scala II, your best bet is to go with a Jubilee tweeter (K402/K-69 or K510/K-69) and convert it to 2-way. This also calls for an electronic crossover and a pair of matching power amps.

It's costly, but it's Klipsch-tested and proven, and the sound will be so fine that you'll forget about wanting any more upgrades.

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The 80° x 30° is stated as being the 10dB down points, industry standard method for horn specs are for the 6dB down points, so by the accepted industry standard method the K400 is narrower than 80° x 30°.

PWK worked for about 40 years before getting an anechoic chamber to do tests in. Most of his early designs were by-the-ear as he couldn't afford a test microphone, spending the money on a frequency generator instead.

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If you want to get the best performance from a La Scala or La Scala II, your best bet is to go with a Jubilee tweeter (K402/K-69 or K510/K-69) and convert it to 2-way. This also calls for an electronic crossover and a pair of matching power amps.

It's costly, but it's Klipsch-tested and proven, and the sound will be so fine that you'll forget about wanting any more upgrades.

Agreed.

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PWK worked for about 40 years before getting an anechoic chamber to do tests in. Most of his early designs were by-the-ear as he couldn't afford a test microphone, spending the money on a frequency generator instead.

What is the source of this info?

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"What is the source of this info?"

PWK in the JAES or JASA, early 40's.

PWK felt that the available microphones all had pressure response problems, both known and unknown, and felt his money would be better spent on a good frequency generator.

Edited by djk
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Usually, sensitivity is measured at 3 feet or 1 metre, but in those specs, the distance is 4 feet or 122cm. Are any of the other Pro Theater speakers measured like that? I seem to recall some being measured at 10 feet, which would be useful in setting up concert sound, but the 4 feet figure is new on me.

Since the La Scala is usually quoted to have 104 dB sensitivity at 1 metre, not 4 feet, could it be that later measurements used more accurate equipment? Or are these numbers always subject to adjustment?

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The nominal dispersion of the stock lascala is a misnomer anyway because it varies greatly with frequency. The same is true for the JBL horns you're looking at too.

I'd echo Islander's recommendation for the K510 or K402....although it is on the pricier side. If you don't mind collapsing vertical polars, then I'd probably recommend the SEOS18 for a cheaper alternative.

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