RRFL

When I bought my LaScala in 1976 the rating was 1w@4feet 104db. From memory, the continuous power handling was 100w and transient power handling was 10 times that provided 100w was the average power over 1 second intervals. Currently the LaScala II is 105db with 1 w @ 1 meter handling 100w continuous 400w peak. If you give the LaScala II 10w you would get a technical 115db and for 100w a technical 125db. An issue called power compression reduces this increase to be less than the technical. 10 times the power, sounds twice as loud to your hearing, which is a 10db increase. So that's "either" 1 speaker supplied with 1w and then increased to 10w "or" 1 speaker with 1w increased to 10 speakers with 1w each. Double the power gives a 3db increase which you can only tell the difference if the change is made in front of you. If you leave the room and a second speaker is turned on and then return you cannot determine the difference, provided the speakers are positioned together. So double 1 is 2 gives 3db increase, then double 2 is 4 gives a 3db increase, then double 4 is 8 gives a 3db increase, therefore you now have 9db increase going from 1 - 8 increase. Add 2 more and you get the 10db. Hornloading, generally gives 10db increase. Then the floor against the speaker cabinet gives 3db. Then the floor plus add a wall behind the speaker gives 6db. Then the corner of the room with it's 3 surfaces gives 9db. So consider this with a Klipschorn or LaScala or Jubilee in the corner and you can really piss off the neighbours. Someone else may be able to explain this better, but the end result is having a system with a lot of headroom makes it sound cleaner. I found that most of the time my LaScala were using 0.2w.

After having set up the pair in the Fairmont Cinema last year, exquisite excellence, for my personal taste, they are just off the scale...

Coat hangers are so good that they don't need Zobels. I reckon I could get coat hangers to actually reach between the 402's and the amps. Great suggestion I have a few that are temporarily decommissioned.

When do we get to see the pics I am not the new owner, it would have saved me floor space but perfectly happy with the mwm's. I thought you had been to audition them with the new owner.

excellent

When do we get to see the pics

I have a set of Plywood Heresy 1 as do most of my friends from my recommendations back in the 70's. Place them in the corners of the room and you will increase the size of the speaker by 8 that's eight times due to the corner loading. Back in the early 80's we had a pair inverted in the rear ceiling corners of the recording studio and they were used to mix down. People referred to them as the amazing big speakers. All the recordings turned out with a excellent results and sounded great on all the clients home and car systems. If you need a small sub after that then and isobaric coffee table is my suggestion with the basket of one driver hanging out between the legs and the second driver mounted face to face with the first with it's basket inside the box. You only need half the sealed box size recommended for one driver but you need twice the power to get the same db level. Choose a driver with a very low fs.

The amps and Jubs are still in the boxes so what it sounds like is all theory at the moment. The X350.5 the most powerful stereo amp in the Pass Labs range, is a class A/B design leaving class A @ 40 watts peak. I am mostly interested in the first 40 watts and the design has a focus on the very start of that power. One amp will sit on top of each Jubilee with one channel driving the HF and the other channel driving the LF. The HF is 50watt peak 150watt the LF is 400watt peak 1200watt. So I will have sufficient headroom even if I set them up outdoors. The logic behind this is that the shared larger power supply is available mostly for the LF channel as the HF does not require much, so there is an advantage here. Plus the input sensitivity for the 4 channels is identical and setting the electronic crossover has one less thing to consider. I did not read the test review about the XA30.5 until some time after I had the X350.5's. I would probably have a pair of XA30.5 with hindsight. I went full out for a no regrets system while the AU$ was high and I could also get, not to be repeated, the best prices on absolute premium equipment, that I would never have to replace. I have now completed my experimenting in building folded horn LFE. After building 9 of them, I'm now ready to build a pair Num 10 & 11 for my cinema system. I'm currently working out the acoustics for the room and it's likely I will now build a 5x5 bessel array into the ceiling for each rear surround. I will have a virtual center channel. Considering, all this is why I think the XA30.5 would be a top choice for Klipschorns as again the first watt is very important and the XA30.5 is a very stable amp.

I considered this amp for driving my KPT-402 since it's rated at 30watts/channel. I finally selected a pair of X350.5 with 1 amp per speaker to simplify input sensitivity considerations for active xover. In hindsight, a pair of XA30.5 would have been more than adequate. I read a review where the XA30.5 leaves class A @ 60watts per channel. It continues in class A/B operation with the test amp producing 153watts in 1 channel and the other channel 156watts @ rated distortion. It's likely to be an amp in the best choice for Klipschorn amps ever.

One of my favourite subjects I like to share so others can share the long term benefits. I take one of each as pictured before my lunchtime yoga or Pilates class. What's missing from this pic is the Musashi Nourish. The pic was for one of the girls in my yoga class and she also wanted to see the experimental LFE I was building at the time for my friendly Klipsch Cinema Dealers home system "music content covered to amuse previous poster :)". I have a target of 17 classes per week and every now and then I get all 17, last week I got 6 classes in. My sups provide omega 3 6 9, "branched chain amino acid" and Magnesium phosphate. I endeavour to eat mostly John West Tuna, Salmon, Lamb leg steaks and Kangaroo iron pan fried in olive oil plus rice cooked in the rice cooker with steamed vegetables. I have a Kuvings cold press juicer which is remarkable. I have a special diet concept; eat a lot of really good food so you are not hungry then you eat less of the food that's not healthy because you are already full. For meats, I believe that if you eat animals that move very quickly most of the time then the meat is better for you leaner and more easily digested fats. My omega supplements help to remove the unhealthy fats. When I eat kangaroo or lamb 2 hours before my Pilates class I am invincible. The energy is without limit, bring it on. I also have a giant trance x2 (2011) dual suspension mountain bike which I ride up stairs as well as down stairs. The food in the total diet is important and supplements are only supplements. Regards Rod.

A.There is something that has not been considered here and that is to use 1 amp per speaker using on 1 channel of each amp. This gives the full capacity of the power supply in each amp to the single channel driven. This can only improve the performance of the amps. B. Also there is the possibility of adding an electronic crossover into your system so that you can time align the high frequency horns more closely to the folded horn woofer. In this case I would suggest using 1 amp per speaker and using the left channel for the woofer and the right channel for the high frequency horns. Again the power supply would have more available for the woofer where it needs the most as the high frequency horns draw only a small amount. Using the amps in this way makes setting the crossover simpler as the amp sensitivity is the same for all 4 amp channels. I assert that the improvement with A. would likely be minimal with the quality of the amps you are using, however it's generally the power supply that is the limiting issue with amplifiers. I assert the the improvement with B. would likely be in your transient response where the high frequency click of the bass drum is better syncronized with the low tonal quality of the drum and have it sound more life like than it already does. This has a flow on effect for everything else that has frequencies spread across this crossover point. Rod p.s. to take this a step further you can take the tweeter out of the cabinet and make a small support for it to sit on top of the cabinet so that the tweeter magnet is directly above the midrange magnet. This gives physical time alignment between this pair of components. Having a pair of Heresy in the rear corners set up so each wall has a left and a right speaker is also a very pleasing result. I did this often back in the 70's in the HiFi shop that I worked in.

Congratulations, My all time favourite finish.

If It Sounds Good, By All Means Listen To It.

With all that in mind:- What about the initial sensitivity variations of main speakers with say a 110db 1w/1m being matched with subwoofers of 80db 1w/1m for their band widths? What about the power compression aspect of the various drivers during exciting parties or when entertaining the neighbours for extended periods? When considering these aspects, is it likely that a pair of Jubilee with and equally sensitive subwoofer of equivalent MAX SPL are essential as power compression is less likely to be a factor?

Yes Morbius...

While I was in my Rocket, I saw this and I was concerned! It appears to be a negative antimatter dual universe. You can see where there were two Suns that must have gone supernova and then two strings of 11 planets with 10 moons that have been caught in a space vortex and become inverted so they no longer exist but the space that was around them has now become solid and exists.

Is there a significant difference?

So is that going to be a double stack with the 402 in between for each corner of your garage.[6]

This is excellent for a tight fit but you need to xover at 250hz. You get bass extension and sensitivity increase in the 35 - 250hz band so just add LaScala.

Awesome

It would loose the jubilee concept of a folded horn of small dimension. When placed in a corner the Jubilee intrudes less into the room than a LaScala. It is intended to be as compact as possible. There is no point messing with the design as the designer is off the scale in this area of expertise.

I suggest you have 3 options. Build Belle or LaScala. The Belle are less complex to build and the KPT-510/K69 is an ideal HF unit. Buy Jubilee Build MWM All can be fitted with the KPT-402 or the KPT-510 Use the recommended drivers and don't mess with what works extremely well and enjoy the music. for extended low bandwidth Build one Tuba HT LP in 24" width with either of the recommended Dayton 15" drivers.

I think the $7,000 figure is for complete Jubilees, bass bins with two 12" drivers per cabinet, plus two K402 horns with K-69A drivers, and includes stands for the K402 horns. The K402s with drivers and stands are around $2000 for a pair. Last time I checked, that $7,000 price included delivery, so it's a pretty good deal. As you may know, Jubilees come without crossovers, and are meant to be bi-amped and have active electronic crossovers feeding a matching pair of stereo power amps. They're a factory-tested combo and come with the lab-tested crossover settings, so you will actually know the complete system is performing as designed. With home-builts, they may sound pretty good, but it's hard to know if they're really performing to their potential, since you probably don't have the testing equipment, skills and knowledge of Roy Delgado, who designed and calibrated the Jubilees, in a team with PWK. Also, I don't believe La Scalas, ported or not, with have the low bass extension of Jubilees. The La Scala bass horns are a simple conical horn from the Seventies, while the Jubilee bass bins are a much later and better design that has lower distortion and bigger sound. rigma is very happy with his homebuilt Jubilees bass bins, and they really are things of beauty, but after seeing the time and expense it took to build them, he bought his second pair from Klipsch, rather than building another pair himself. The JubScalas are less expensive and smaller than Jubilees, and are said to provide about 90% of the sound quality of Jubilees. I haven't heard Jubilees myself, but I've read this on the forum a few times. If my budget ever permits, I'll likely order a pair of Jubilees, for the improved sound, plus I already have the matching amps and the EV Dx38 digital processor. "ditto that"

This will be the same principle as the Tuba HT LP placed in the corner against one wall with the mouth facing the other wall 18 - 24 inches away from the wall. The corner gives 12db gain with flattening and extension of the response.in the low end the band width is 15 - 100hz With the MWM band width is 35 - 500hz and I would anticipate loading the mouth toward the floor or the wall could improve the low end of the band but may be detrimental to the top end. I have considered this with the LaScala and using an active xover so it can be aligned properly.

I second that. Motion carried Build MWM + KPT-402 [H]