tubesandhorns

OK, this is one of the coolest things I have seen in a while, much thanks to djk and the forum for introducing me to this idea. So here’s my question: if one were to do this in a La Scala, how would the extended/ported doghouse play into it for extending the bass? How would one calculate the size of the chamber extension and ports, if they were needed at all? I am very curious about how the listening tests go.

"I'm not sure what you mean, the four drivers are wired push-pull..." Oh, I see what you mean... guess I should read more carefully before typing. I thought that you were loading the drivers isobarically, and didn't notice that the slot was between them. Very sweet. So how do they sound, and how does this affect the frequency extremes? Did you need to extend the box like with the ports or anything? This is truly fascinating, thanks for posting..

I believe that the distortion will drop further if you turn around the loading speakers so they point away from the front two and reverse their phase.

Thinking about the original title of this tread, has anyone tried the Faital with a circular tractrix like the Stereo-Lab CF250 for a 2-way system? I have read glowing reports of the Eliptrac in a similar application, I would love to know how a circular performs. Thoughts?

I have been toying with making what I call SuperScalas- ported La Scala bottoms, CP25 tweeter, and a BMS4592 coupled to probably either a Volti FC260, a Eliptrac, or a Stereo-Lab CF250... as illustrated. If I seal off the top and port that, I can put the tweeter on that section and put the mid horn on top. This looks pretty much perfect to me. Only remaining question (yeah, right) is to port out the front or port out the back. Dave touched on that briefly a couple of years ago, but I was wondering if any of you have any experience with playing with that variable. Any thoughts out there? Also, if I have drastically missed something, when you get up off the floor from laughing I would love to hear what that is.

I don’t think that I posed my question well enough. Arguably, over the years there have been deficiencies with K-horns that are addressed by DIY hobbyists- such as the mid horn and the crossover. My question was intended to ask if the current production addressed those problems. An analogy might be the Fender Telecaster guitar. Tele players over the years might replace the pickups with humbuckers, or add a third pickup, or change a tone capacitor. Fender saw this, learned from it, and now offer factory models that are outfitted with the popular tweaks. So, I was wondering if Klipsch has addressed the issues usually tweaked by DIYers, or might one be better off buying a used pair and hot rodding the myself.

Sorry, I wasn't asking what MFD is, I meant where is it used in the K-horn. They used to just be plywood and I was surprised to see MDF in the construction. I was curious if anyone knew where in the box and why... and I guess is it better or just cheaper for that specific application.

I read with great interest all of the updates and upgrades available for this venerable masterpiece, and am wondering how a new production unit would compare sonically to a vintage item that has been tricked out with new crossover, tractrix mid horn, 2” (BMS 4592) driver, etc. Anybody experience with this? By the time I buy a fairly recent used K-horn, add all of the above, etc, I am approaching the cost of a brand new unit. While we’re at it, I see MDF is used in part of the current K-Horn, any body know what is plywood and what is MDF?

Some questions about crossovers: 1) There are several excellent crossovers offered for Cornscala type speakers, but much flexibility on the drivers- Seleium, BMS, etc. Don’t the crossovers have to match the complex impedance characteristics of the specific driver? I assumed that at this level of performance the two need to be carefully matched. 2) I see references to changing taps on the autotransformer to match levels. Doesn’t this change the impedance as seen by the crossover, and therefore the corner frequency 3) While we’re at it, why autotransformers and not resistive L-pads? Thanks for any insights.