oosting

"What some people will say with some cables is that it is adding detail. To me, it could sound harsher to me. ... We think we can hear the difference." 'Nuf said. Ed PS. They are Little Gray Men, not Little Green Men.

Well, everything I have learned I learned from the school of hard knocks. Persons should not be so presumptious. Conservatives come in many different flavors! Don't lump me or anyone else into one catagory. You are making a grave mistake if you do. BTW, you have to do more than just read and study ideas. You have to actually go out and live those ideas to find out which ones are valid. You must not have only beliefs, you must have knowledge! For example, you need to live the welfare life to be able to comment on it's validity. Likewise, you must go out and listen to a speaker instead of just reading about it's attributes in an audio mag. Ed

This debate about CO2 is stupid. If you feel strongly about reducing CO2 emissions, don't wait for the government to force you to do something about it, do something NOW. It's all personal decisions. Don't drive your car unless you absolutely have to. Don't play your stereo for more than 1 hour a week (electricity generation generates CO2). Don't turn the lights on in the house until after 10:00 PM. Don't run your computer for more than 15 minutes a day (a real energy hog, therefore CO2 producer). And, last but not least, don't eat chili or other flatulent-causing foods. You know, politics is kind of like speaker brand loyalty. The liberals and democrats are like Bose owners. They think they have the very best and there is nothing better and don't confuse them with the facts. They tend to get emotional about their choices in speakers. The conservatives and republicans are like Klipsch speaker owners. They have heard all the brands, they have made careful, intelligent comparisons and they KNOW they have the very best that they can afford. They are very rational about their choices in speakers. They took a long time finding Klipsch and there is no going back to Bose! The libertarians don't own speakers. Ed

I got to say more! The dems claim we can't afford a tax cut. Just think how many Klipsch speakers you could buy with a reasonable tax cut (say 50 percent). For gods sake, its our money! The Regan tax cuts brought about an huge increase in revenue. The reason there were deficits is because the Dem. Congress would not cut their spending like they promised. So, lets have some tax cuts and a huge amount of spending reductions. Then we can have a set of Klipschorns in every livingroom! Ed

Smearing? If you take two 1000 Hz sine waves of the same magnitude (peak voltage or SPL), one at 0 degrees and the second 120 degrees out of phase and combine the two, you end up with a 1000 Hz sine wave of the same magnitude as the originals but 60 degrees out of phase. The base doesn't broaden, it stays exactly the same. Otherwise, you would have a frequency shift along with amplitude and phase shifts. That is impossible. When you have multiple sources of the same frequency, you always have constructive and destructive interference, even in an anechoic chamber. This is one of the penalties of stereo. If you have two perfect point sources, you still get interference with stereo (and other multi-channel sound reproduction). The simple fact is that other factors far outweigh phase problems in the overall listening enjoyment or we would all stick to headphones where there is NO interference. Ed

He may own Klipsch's but he would have to pull his head out of his yeahoo to listen to them! Ed Clinton has had a lot to do with the prosperity of the last 8 years! His retro-active tax increases slowed it down!

For a given volume of a box, the cube has the smallest surface area, using the least amount of materials. Ed

Mr. Blorry, I think you should treat your lovely neighbors to a 2:00 AM session of KODO. You know, the track where they are whailing on the 6 foot drum! I wake my wife up (at 2:00 PM) with that one once in a while. I just crank up the LaScalas and she can feel the waterbed slosh to the beat! Ed PS: Oh yeah, I ticked my neighbor off. She said she couldn't hear her Cher CD when she was in the same room with her stereo because we had our stereo playing too loud in the next house! I love my LaScalas!

Just like her, it's probably a fake! Ed

On alternative you might consider is a tube/ss hybrid. I have an old Luxman LV-103, 60 wpc (tube pre-amp and MOSFET amp section). It really sounds good. Sweet and powerful. There's an LV-105 on Ebay rught now (80 wpc) going for $227.50. Ed

Basically, dB is a given by the equation: dB = 10*log(power ratio) + base dB base dB is the speaker effeciency (104 dB at one watt at one meter for LaScalas). If we are generous and assume your friend's speaker effeciency is 100 dB, this would mean they would need a total power input of 100000 watts to get 150 dB output. Of course if you are inside a small car, you would need less power to attain 150 dB. Ed

Check out places like the Salvation Army Thrift store. I found an old Sansui 100W receiver there for $8. You'd be amazed what you can find. Ed

S = 1978. Same year as my LaScalas! Great year! Ed

You are better off trying some cheap damping materials before going to $$$$ SET $$$$ amps. You might even try (GASP!) equaization to remove some of the "brightness". Let's see...turn the treble knob to the left 15 degrees or spend $2000 on a new amp...... Ed

cls72, I replaced the diaphragms on my k-77 tweeters (the AlNiCo versions with round magnets) using diaphragms from EV with no problem. The diaphragms I used are just like you described. There are only a few possibilities for the low output that I can think of: 1) something stuck in the voice coil air gap, binding the voice coils 2) voice coils both out-of-round or not the right size 3) magnets have lost most of their magnetism Don't think it is 1 or 2. Check the magnets by placing a large screwdriver close to the voice coil gap. The magnet should grab the screwdriver. You should be able to lift the magnet portion of the tweeters with the screwdriver if you lay it across the front of the magnet portion. That's all I can think of. Ed

You know, 20Txxx's were made in 1979. Have you ever replaced the tweeter diaphrams? Do yourself a favor and buy new diaphrams from EV for around $50 including S/H before you rip into the x-over. My LaScala's were made in '78 and needed the diaphhams replaced because I wasn't hearing much high end. They are easy to replace. Electro-Voice part #89486 A -- diaphrams for T-35A tweeter. Cost $21.70 each + 8.00 S/H. Phone: (800)234-6831. Ed

check this thread for ordering information: http://www.klipsch.com/ubb/Forum2/HTML/000086.html Ed

All, Mr Gill is right. A cutoff frequency of 62 Hz gives you a doubling rate of 1 ft. I corrected the spreadsheet yet again to accurately calculate the doubling rate. It's at: http://www.ameritech.net/users/oosting/Exponentail_Horn.xls. It's a work-in-progress! What I find intersting is that the LaScala has a cutoff rate of around 60-70 Hz and responds down to 45 Hz. It's correct that that the area of the exponential horn will double in 1/18.1 of the cut off wavelength. That number comes from the equation: Doubling length = Cutoff_wavelength x ln(2) /(4 x Pi). For a cutoff of 30 Hz, the area would double every 24.8 inches. Ed

John, Sounds like a good idea. Having a 24 inch wide throat might be a problem though. You could fan the sides out but keep them flat. I modified the Excel spreadsheet http://www.ameritech.net/users/oosting/Exponentail_Horn.xls to do that. I also fixed some typos. Ed

Yeah, you're right. I must have had a brain cramp! The effective driver area of the LaScala woofer is 132.7 sq in (13 inch effective diameter). The throat area is 39 square inches. That gives a compression ratio of 3.4. Thanks for correcting me. As far as I know, the essential thing for the horn to perform correctly is that the area increases exponentially from the throat to the mouth. The LaScala starts out as a 3 by 13 inch rectangle and ends up as a 23 inch square. And, it seems to work quite well. Are you looking at making one fo the horn's dimensions constant? For example make it 12 inches thick from the throat to the mouth? It would start as a skinny rectangle and end up as a large square or even a really fat rectangle at the mouth? It would be much easier to build that way. Ed

John, I put a copy of the spreadsheet at: http://www.ameritech.net/users/oosting/exponentail_horn.xls. It calculates the horn cross seectional area and side lenght of a exponentail horn with a square corss section. All you need to do is input the cuttoff frequency, the effective driver size (13 inches for a 15 inch driver), , the compression ratio (driver area divided by throat area) and the mouth factor. The mouth factor is 1 for a horn mouth in free space, 2 for a horn mouth placed on the floor, 4 for a hron mouth up against a wall and 8 for in a corner. Note: the LaScala's have a compression ratio of 3.7. Ed CORRECTION: http://www.ameritech.net/users/oosting/Exponentail_Horn.xls

John, Olsen in his "Modern Sound Reproduction" has a section on horns whith the equations for exponential hrons. He also shows some examples of base horn folding. You can probably find it in a local library. If you want, I can email you a Excel spreadsheet that will calculate the expansion curve. The calculation is the easy part, designing and building these things is hard. Ed

I don't understand. Some say that the throat size is critical to smooth frequency response. Paul Klipsch was not modifying the throat size to improve the response of the squalker. He was modifying the PHASE PLUG. Please help me here. What's the Physics behind the assertion that throat diameter determines smoothness of frequency response. I thought the main determining factor was flare rate. Raggedness is proprotional to flare rate. When I say help me with the Physics, I mean give me equations, not hearsay. Ed O.

Let's see. I paid $1000 for my '78 LaScalas used. $30 worth of new Caps. $15 in refinishing materials. Can I do this upgrade to my LaScalas? That's only 3X what I paid for them! Put the spare parts up on Ebay and let the bidding war begin! I bet you can get $500 for the lot! Ed