Don Richard

The bitstream from a digital audio player is quite different from that of a digital still camera - it is happening at real time. The 1s and 0s may be exactly the same but with incorrect timing. This is called jitter, and is easily audible. The 1s and 0s from a still picture are timing-independent, and the only thing that is important is that they be there correctly. Note that the specific equipment involved, besides cabling, is at issue here. If the cable bandwidth is insufficient the square wave signal that carries the data may be rounded or distorted. Equipment with better buffering capabilities can correct jitter by clocking the data at the correct time into the A/D converter. HDMI carries both video and audio signals. Part of the HDMI standards involve synchronizing the various video signals so that they work properly together, and that the audio is "lip synched" to the video. It is my understanding that this is done partly to compensate for cabling issues.

The HDMI standard is evolving. The older standard (HDMI 1.2?) passes a 75 Mhz bandwidth. The newer (HDMI 1.3?) passes a 340 Mhz bandwidth ,10.2 Ghz bitrate.This shows up when playing 1080p on a set capable of 1080p. All HDMI cables are built to a standard which, if the cables are properly made, provides proper operational bandwidth for that particular standard. In any event the audio bandwidth is less than either standard's maximum and should be relatively unaffected.

I recently heard a set of analog interconnect cables ($800) that a salesman in an audio store was pushing. He hooked them between an Audio Research amp and preamp and, to my surprise, I heard a distinct difference. The highs were rolled off compared to the original cables. Personally, I believe that any cable should be neutral in sound quality. The $800 cables were most likely of higher capacitance than the first cables, thus the effect that I observed. This cable could actually be of some sonic benefit in some cases, but so would $10 worth of caps soldered across any interconnect. I think that people who buy such interconnects are into having the costliest stuff available, for bragging rights. That's perfectly OK, it's a free country, nothing wrong with that. You spend your money, you make your choice.[8-)] The issue concerning reflections in a digital interconnects are valid performance issues. There may well be significant improvement realized by going to a different HDMI cable, and as has been stated previously, this shows up most readily on video.

Hornresponse's SPL window shows the power response of the horn. It can also give axial SPL at any polar that you select. After you calculate, go to tools, select directivity, then select response. A window will pop up with a place where you can enter the degrees off axis you wish to measure. Note that at 0 deg. the curve given will be the axial SPL, which is what you normally see on a mic'ed response curve of a speaker. The Hornresponse program is an amazing program with many uses and features. http://www.diyaudio.com/wiki/index.php?page=Hornresp+Help This may help in understanding all the features this wonderful program offers.

Thanks for the info, Maron. Do you have any dates on these Georgian cabinets? The EV info that I have is for an exact Khorn bass unit, dated 1953. I have no other info from EV on the 4-way Georgians.

The link that I provided clearly states "Patrician IV". Did you read it? It looks like a DIY with EV components. I choose to believe the info published by EV that I have in my possession, and on their website. Please reference any other info from EV about the Georgian horn and post it here.

I am afraid you already did... Dave I didn't comment on this thread....Does that mean I have by omission? Yes and No No comment[6]

The original Georgian horn was made by EV under license from PWK. The EV prints that I have are dated 1953. It was a 3 way. Subsequent to 1953 PWK pulled the license from EV. Around 1955, Roy Carlson of EV designed the Patrtician, a 4 way system using an 18" bass driver.: http://archives.telex.com/archives/EV/Speakers/DIY%20Manuals/Patrician%20IV%20Part%201.pdf I'm fairly familiar with the EV Georgian (PWK-licensed design) and early Patrician IV enclosures and I'm not familiar with any 15" version of the Patrician enclosure called a Georgian, but I'm always up for learning something new. In any event, if there was a 15" version of the Patrician type design it would have been done after the original, PWK-licensed Georgian in 1953. Please post any info on this with dates if you can. If what you have is a real EV product it would be quite rare and the Japanese audiophiles would give a lot of money for it.

An option could be to get away from an exponential bass horn and employ some sort of combination enclosure. http://www.speakerplans.com/index.php?id=hd15horn This is a bandpass horn similar to the Turbosound TurboBass module. You are sacrificing upper end extension for bass power and smaller size, and these boxes need to be run in multiples (4 or 6) to get enough mouth area to be maximally effective at lower frequencies. These are for a 15" driver but Hornresponse can be used to design a 12" version. These are about the simplest horn enclosures to build that I have seen. There is also a website that has plans for a LaScala type cabinet for a driver smaller than 15". I think that the website is Volvotreter.de, but not sure. Good luck!

What's the date on EV cat. #122? My info says the basshorn part # is 8561, the cabinet shell is part # 896-781 thru 896-784, depending on the finish.

Sorry, dude, this is no more a Georgian than it is a Corvette! The EV Georgian was a 3 way, there was no opening in the front face, there was no tailboard on the Georgian. I'm looking at a complete set of EV Georgian plans drawn on 5-28-53 by J. Locke of EV Corporation. Some of the components look the same but the bass horn enclosure is incorrect. Someone may have tried to scale down a Patrician for a 15" driver and use the Patrician components. Also a friend has a pair of real Georgian bass horns, and they agree with the plans that I have.

That just about says it all.

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The Georgian was manufactured by EV under license from Klipsch in the '50s. The woofer was a 15WK, the "K" denoting a 3.2 ohm voice coil. The throat in the bass horn was 78 sq. in. versus 39 sq. in. on later Khorns. The tweeter was a T-35. I'm not sure about the mid or the crossover but I have some info on the Georgian horn at home that would ID these parts. Check the EV website under obsolete products, they may have all you need to know there.

It sounds like the tweeters are not working properly, and this can cause the speakers to sound exactly as you described. Try wiggling the connections to the tweeter while listening to it. Look to see if the terminals on the tweeter are moving or rotating or if the wires are making good contact. Check the tweeter wires where they connect to the crossover by wiggling them and make sure they are not loose there and that they are connected to the proper terminals on the crossover. If everything seems okay there get some lamp cord wire and temporarily replace the wire between the crossover and the tweeter to see if the tweeter output returns to normal. Do it one step at a time so that you isolate and pinpoint the problem. If none of the above helps you may have damaged tweeters or a crossover problem. In that case, take some pictures of the crossover and wiring and post them here. This seems like a simple problem and it should not take long to find a solution.

Operating a 2 inch driver on a horn in your home with sufficient input power to achieve power compression, on a regular basis, will ensure you will never again hear 20kHz.[]

Tapped "horns" are interesting devices but are combination enclosures that behave more like transmission line enclosures down low. LF distortion is higher than with an exponential horn.

When the saxophone was invented in the mid-1800s many people felt exactly that way because of the different sound it produced. The sax creates high amounts of odd-order harmonics that make it sound rather like a square wave, and that was an unusual sound for the time. The sax is my personal favorite out of all the reed instruments to play - I like that "blatty" sound!

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Complex audio waveforms are absolutely caused by frequencies different from the fundamental being added to that fundamental frequency. Harmonic distortions are integer multiples of the fundamental that are added in various proportions to the fundamental. If one runs an FFT on a waveform, the result is a spectral plot of individual frequencies. A single, individual frequency can exist only as a sine wave, and a complex waveform can only be made up of sine waves of various frequencies and amplitudes. The characteristic sound of a musical instrument is composed of a note of a certain pitch plus it's harmonics. That's why two reed instruments, an oboe and a saxophone, sound different. The relative mixture of the fundamental frequency and harmonics of an oboe and a sax are quite different. Adding harmonics in a sound reproduction system can make a noticeable change in the timbre of instruments. But, as has been stated previously, these distortions may be euphonic in nature and pleasing to some listeners. Personally, I'm sensitive to harmonic distortion. Where some hear "increased warmth and fullness" I hear harmonic distortion. When some say "I hear things I never heard before with this new whatever", I'm thinking "Me too. Distortion". Anything added to the original by the reproduction system is, by definition, distortion. Whether you like it or not.

A lot of people freak out when they find out that a constant directivity horn requires EQ. Not to worry, however. In this case, phase is corrected as well as frequency response. Don't worry about the additional power delivery caused by EQ blowing the driver - there is simply not enough energy up there to cause problems. Same with any added harmonic distortion - it will be well above human hearing range. In the case of the k-402 & k-69 graphs that were presented it seems that most of the EQ was done on the low end anyway.

Not nearly as well as a K-33. These are 8 ohm speakers. so they will not match up well with any stock Khorn crossover. Also the Qts is too low (should be around .4 -.5) and the resonant frequency is too high (should be lower than 30 Hz.) Here is a website that has K-33 specs: http://www.volvotreter.de/khorn.htm Almost any 15" driver will work and make sounds, but not any old driver will give best results. BEC has replacements that are very,very close, if not exact.

Thanks for the info, guys. As best as I can remember somewhere in the '70s was when I first heard the term used.

Apperently, electricity flows much slower than lightspeed. http://www.eskimo.com/~billb/miscon/speed.html I think this is a matter of semantics - electrical energy flows at lightspeed.