infurno

Sorry about the delay, had to catch up on some work. The Jamboree is a pretty radically different design and has little to nothing to do with Klipsch or Jubilee. For example, it only has 1 fold and a shorter path as already pointed out. The Jubilee seems like a much better proven and refined design and I think a 15" Jubilee would be more unique and interesting than a Jamboree. Not to mention the Jubilee is much better documented and the plans are easier to come by. (I have not yet seen plans for a Jamboree, but I'm familiar with the horn layout)

That's a very interseting idea, but there is a problem in your illustration. First, I'm no expert and someone please correct me if I'm wrong but I believe your addition to the front horn element will interact with the wave in very strange ways creating nonuniform directivity and many other problems. Second, your illustration is a modification of an already modified design: Just to make sure there is no confusion, I'll go over the current design state: The original La Scala plan: Here is the modification currently considered: The only changes are marked in red. The interior chamber and cabinate is stretched by 3 inches, leaving all other horn dimensions identical to the original design.

Yeah I reached this conclusion the next moring with a cup of coffee and help from everyones response. Some from Selenium and B&C DE250 with a few waveguides and horns. A 18sound horn was the last thing I toyed with. However, I also did my homework and the general concensus appears to strongly discourage placing a CD anywhere that low. At least, a CD that would need to reach anywhere near 20kHz. As a 3 way it may work but I'm trying to avoid that..I saw a CD from JBL that was interseting but it's a bit pricy.. something to the tune of $500.

I'm curious too! If my math is right the volume of the modified chamber in the current design is ~68 liters per driver (dual woofers 68*2) . The internal height is ~22 1/4". I don't think space will be much of a problem, there are a number of 15" drivers that would work well. My current center channel is a Gedlee Summa clone (DE250/wg and B&C 15TBX100 15" Woofer) I may prototype the horn and run some frequency/impulse measurements with this woofer and see what happens. http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=294-670

I have been playing with the idea of Jubilee for months now. I think the real reason I'm interested in it is because of how people praise it's acoustical properties and it's a bit of an exotic. I'm looking for a high performance, high fidelity, high spl, low distortion, and something a bit more challenging to build. If the project is a success, it will be placed in a HT, just not sure what it would be doing just yet. Depends on how it sounds. One of the reasons I never started building a Jubilee is because I could never design a two way system I was happy with. Still can't. The low crossover of this LF horn creates serious limitations in HF. Compression drivers don't seem to work well to such low xo without massive horns and compromising the higher end and thus requiring a super tweeter. Again, leading to a 3 way. I'm not going to make this a 3 way because of the problems associated with multiple drivers and crossover points. If I recall correctly, Klipsch originally wanted the Jubilee built as a two way but ended up having to compromise. Looking at all sorts of HF options. Everything from CD, horns, full ranges... Even BG planar transducer line arrays, which may complement the RD50 planars on my mains. [^o)] I don't have a two way design yet but I figure building the cabinet will take a while anyway. Was down at Home Depot today and have my first set of panels for my 15" Jubilee. I'll follow in the footsteps of others and for now plan to stretch the center chamber. Building one cabinet at first to see how it works, I'll be using an active DCX2496 xo and a dedicated amp.

Actually it looks like this is exactly what William F. Gil McDermott did in his Caves build. Extended the chamber by 3 inches to fit the 15" drivers. Since the Jubilee is symmetric this is a simple modification as you pointed out but I wonder how well this works in the end.

Agreed. Now that I have had coffee, I realize this was a silly idea. I'm a bit over my head with this one. Horns are a pretty advanced topic compared to my previous projects (picture here). Not really sure how to design and simulate with hornresp yet, or what characteristics of a driver make it good for horn loading. Low QTS and a high BL but I'm sure there is more to it. I'll stick to proven designs and search for the 15" Jubilee mentioned above.

Math is not my strong point, I'm relatively a newbie to speaker design (7 built), and it's pretty late at night. With that disclosure in place, I wanted to share an idea for a 15" jubilee. I used the plans for a La Scala as a starting point. The inner panel which mounts the 15" driver on a La Scala is 397mm x 565mm. I found the same part in a Jubilee and found it's ~22.5% smaller. Then I used this ratio to convert the rest of the measurements. What I ended up with is a 51" x 37" x 23-1/2" woofer module. Double the height and add reflectors to fit two drivers. Am I an idiot or does this show promise?

I'm very reluctant to buy any used audio equipment. The way I understand it, buying used high end speakers is like buying a used sports car. It may have been babied or put through hell by the previous owners. I'm sure there are deals out there if you know what to look for... At the moment I don't.

Thanks for the advice. Guess I should have done more homework before buying the F-1. I'm fairly confident I can sell them without a loss... That's the only reason I'm entertaining the idea. But I'm still new to this. I read a lot about the aluminum compression driver, the accuracy, quality, and unique sound of klipsch. The Polk 70 has 5 drivers for bass, mid, and tweeter. The frequency response is 40-24kHz -3dB and lower sensitivity. I have a feeling that the F-1 will still sound better. Putting a lot of thought into building my own speakers. Swans Speakers Hi-Vi drivers in a series on a 3 way xo. Modeling in WinISD, the prospects look great. However, I understand there is a lot more to it than crunching numbers so I thought about maybe building one and see how well it works...

Never really cared much about audio until I bought a set of 5 Klipsch F-1 speakers for $150 each last month. I'm really impressed with the sound, listening to everything as if for the first time. Just got a SW-450 and ordered parts to build my own 15" subwoofer. This is turning into a bit of an obsession and I'm exploring to see if I can get even more. Looking around, Polk has the Audio Monitor 70 at $219. All the numbers make it look like a superior speaker, except for the Sensitivity at 90dB... I'm thinking about selling my 5 Klipsch F-1 speakers and replace them with the Polk 70. I understand that the opinions here may be somewhat biased, but so am I. I'd like to stick to the klipsch brand, but also looking for the most bang for my buck. It's a 2004 speaker... Where does the F-1 stand today? Do I have anything to gain by switching to Polk 70? I can't actually listen to the polk and see for myself since it would be an online order.