CornTall
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Dave MacKay
Active Member
gberchin
Active Member
It would be 15½" deep, just like the existing Cornwall IV; approximately 45" tall by approximately 18" wide. I can't cite exact dimensions because I've found discrepancies in the reported dimensions of the existing CW. The import point is that the internal volume would remain the same.
If internal volume is the same, and tuning is the same, then modeling will be the same. There may be some minor effects from the different aspect ratio; that would have to be worked-out.
EDIT: Probably closer to 51" tall. It's difficult to figure out the actual volume of the existing CW4.
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DirtyErnie
Well-Known Member
Beautiful Name
Gigantic
A big, big love
I was planning on something along those lines, albeit with a passive radiator and a PRV WG4550 mid horn, then I heard a a vintage LaScala and knew I couldn't live with out that, even if the rest of it made it one of the worst speakers I'd ever heard. The idea in my case, was to take the best aspects of the Chorus and Cornwall and combine them, notably the Chorus's reflex alignment with a passive, along with its footprint and the displacement of a Cornwall. it would have been a bit wider, given the width of the mid horn, but not all too different from your configuration, Greg. IIRC, it had modeled to 28Hz, using a JBL 2226H woofer. I ended up taking all of my parts that I'd gathered for that, building a LS bass bin and a larger enclosure to accommodate the mid horn, tweeters & passive radiator and ended up with a similar Vas and ultimately, even lower in room extension.
gberchin
Active Member
Since I figured-out how to Linkwitz Transform vented woofers, I prefer to tune to a very low box frequency and then LT the response to whatever works best in the listening room. With amplifier power and DSP being so inexpensive nowadays, I've found this approach to be very practical.
My reservation about the LaScala bass bin is that it's fundamentally a 60Hz horn. Though I like the dynamic performance, 60 Hz just doesn't cut it for me any more, since my Linkwitz-Transformed Legacy Focus measures -3 dB at 22 Hz in my room.
Gigantic
A big, big love
Using the DJK port mods, but further modifying it by increasing the upper horn chamber to 18” h x 24” w x 24” deep and using a 15” passive radiator on the rear, I’ve got it -3dB to 22Hz and with a little boost from the DSP, it’s -3dB to 20Hz. The La Scala is really a 100hz horn (or approximately thereabouts, I can’t recall the exact number) with the rest of it being direct radiating through the slit in the horn chamber and the horn mouth. My adaptation of Dennis J. Kleitch’s port mods does the rest of the work. The downside is that there is an increase in group delay below 60hz, but i maintain that it’s not noticeable unless you’re familiar with horn loaded sub bass, such as one of @Cask05’s Jubilees or a Bill Fitzmaurice bass horn, if it’s noticeable at all. To me, it’s bet than any subwoofer/speaker combo I’ve heard, much less owned, but I’m also aware of my own cognitive biases.
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gberchin
Active Member
Oops, I think you're correct. I modeled it and the Belle long ago on the Klipsch Forum, and 100 Hz sounds about right. I think it was the University Classic that modeled as a 60 Hz horn.
DirtyErnie
Well-Known Member
Ya know, I have a couple of those new 15" JBL Neo dual-voice-coil things in my garage... You're giving me bad/good ideas
My 86 LaScala's.
The Klipsch La Scala loudspeaker from 1986 features a fully horn-loaded, three-way design with a frequency response of 45 Hz to 17 kHz (±5 dB) and a sensitivity of 104 dB SPL (1 watt/1 meter)
This is what PWK claimed the LaScala to be. An audio engineer in a controlled environment. Anyone saying different is calling him a liar. No offense meant, just saying.
The Klipsch La Scala loudspeaker from 1986 features a fully horn-loaded, three-way design with a frequency response of 45 Hz to 17 kHz (±5 dB) and a sensitivity of 104 dB SPL (1 watt/1 meter)
This is what PWK claimed the LaScala to be. An audio engineer in a controlled environment. Anyone saying different is calling him a liar. No offense meant, just saying.
I listened to my speakers without a sub for 30 years before buying a sub and never thought I was missing anything. With the sub the bass guitar does sound more pronounced. I knew I was sacrificing an octave on the lower end, most LP's at the time did not go that low anyway, for quick dynamic bass. Well worth the sacrifice to me at the time. A sub readily fills in the missing octave now but I sometime leave it off for listening. When I bought my speakers they were 1/2 the price of the K-horn.
gberchin
Active Member
Hornresp has proved itself to be a pretty accurate modeling program. Analysis of Klipschorn and La Scala cabinets with several drivers You can interpret the results as you see fit.
Proved by who?
I have used and seen many modeling programs and they are just a starting point for building a circuit or a speaker design. Real life results are only proved after building the thing. You are believing theory and not results. I prefer believing an audio engineer who has actually built and sold many of the things for decades, tested and proved by many other engineers and not some program amateurs play with. Most amateurs do not know how to interpret the results they come up with anyways. Your analysis is the reason PWK carried his BS button.
I prefer to believe the results an audio engineer came up with after building his product. Proven results and not theory. You can bet after 63 years of being produced PWK's results would have been challenged by competitor engineers if his results were not true.
Ridiculous what is being said and believed on social media sites sometimes.
And how do you know that?
Where did you get your engineer degree and where can I buy your horn loaded speaker at?
Gigantic
A big, big love
yes, the frequency response extends to the charitable figure of 45Hz, however it only functions as a horn to around 100Hz. this isn't rocket surgery, it's basic physics and is well documented. There's really not any debate on this.
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I have not said anything about where the horn stopped functioning. I have only quoted the specs of the LaScala by PWK in 1986. I trust what PWK said then and I trust and still do today. Most could care less the specific frequency the horn falls off. They only want to know how low it will go. The bass the LaScala makes is fantastic only bettered by the K-horn.
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Gigantic
A big, big love
We’re discussing horn loading and you seem to be shouting into the void.
FWIW, Greg Berchin, iirc, is an actual engineer who, under the name “Edgar” provided an an enormous amount of information to the knowledge base at the K community that was either verified or not contradicted by klipsch engineers.
gberchin
Active Member
Yes, you remember correctly. However, as this thread is rapidly going off the rails, I will comment no further.
Guys there is a misunderstanding here. I am not disputing the frequency the bass bin quits acting like a horn. Sorry.
The issue I have is the casual reader, visitor may come to the conclusion the LaScala has no bass below 100hz from reading some of these post which is not true. PWK said 45hz and I believe him.
Sorry if I have offended anyone.
The issue I have is the casual reader, visitor may come to the conclusion the LaScala has no bass below 100hz from reading some of these post which is not true. PWK said 45hz and I believe him.
Sorry if I have offended anyone.
