vasubandu

That for some reason reminds me of an early attempt at translation software. Had to be in the first half of the 1980s based on who told me. It was English-Russian, and the ultimate test was idioms and expressions. So they gave it the English "Out of sight, out of mind." And they got back was "Invisible insanity." The advances in artificial intelligence and quantum computing are staggering and in many ways terrifying. I figure as long as they call it artificial intelligence, we are OK, but whey they start just calling it intelligence, I am moving to another dimension.

Will it still be dead when we have mag-lev trains that go 350 miles per hour and can transport you 500 miles faster than you can get to the airport. Oh, and they will have special cars for the transportation of speakers. Imagine sending those La Scalas to a new home on a bed of air.

History does not repeat itself. Historians merely repeat each other.

Somewhere I have a list of the sales prices that chased down to 2014. I made an effort to confirm that they were all sales, but could not for about 5-10 of them. Most of them had a very short duration of availability, which I took as a sale. As I recall, the prices were in clusters, one around $800, and one around $1,600. A surprising number at $1600. But for a 20-year old speaker with no parts, that just seems too high. There are somewhat comparable alternatives in similarly configured speakers. No idea if they are as good or better. If they were $900 including shipping that would be easy. Then again, the pair in eBay right now are $1,075 with shipping because the idiot said $75 shipping. It would cost $500 to FedEx ground them to me. Not sure about version though.

If anyone has a pair of Rebels with coaxial 15-inch speakers, to sell, I would be interested in them depending on location and price.

OK I have another live one, but this one seems real. This is the email I received in response to one of my wanted ads Hi Vasubandu, I have a pair of Klipsch Epic CF-4, the most desirable version 1 with the longer ports. They are in OK cosmetic condition, and perfect working condition. I am the second owner and have been using them as my main speakers for over 8 years since I bought them. I have praised them many times on Audiogon, where I am known as roxy54. They are sonically superior to all of the speakers that I owned before them. If you are interested, I could take pictures. I would ask $900.00. Thanks, John He and I have exchanged a number of emails, and he seems totally legit. Question is whether a pair of cosmetically OK CF-4 version 1 worth $900 and the cost of shipping from Phoenix.

I just wanted to own something with CF in its name.

Bill Fitzmaurice corrected this statement on his board. He said that wave does not actually pass through the wall. It vibrates the wall, and if the wave is strong enough, the vibration will emit a sound out the other side. I am taking his word on it given his background, and a lot of sources say that waves do pass through walls, but maybe it is a shorthand. It is is true, it makes a lot more sense of subwoofer enclosures, at least to me.

I just emailed and said I would take them. Patience will do it. Unless I make one from scratch first.

I know, I know, but I thought I could start a streak. The CF-2 is 2 8-inch woofers and a tweeter. I already have that times 5.

OK @Tarheel Itake that to mean it is one piece and does not fold int place with a motor. Bummer, that would sweet. I want a convertible, but in Seattle, the top has to genuinely be waterproof, and my Miata was anything but. Sweet looking car though. Bet you will have some fun.

Will it never end? Pair of nice cf2 local on Craigslist for $200. I figure a guy has to start somewhere so I email the seller and say I'll take them. We arrange a pickup the next day. Later she emails me and says someone else offered $250 and really wanted them so she sold them. I mean seriously.

Hey @Tarheel is the top on that Z4 automatic or do you have to lift it off. Been looking at an MB SL55 AMG same vintage. Hard top is automatic. Z4 might be an alternative.

Sadly, he is already committed to enjoying his spring in the Pacific Northwest. The good thing is that he enjoys working.

@Ceptorman That is drop dead gorgeous. I would have put a wood fired pizza over on the fountain side, but that is exceptional work.

I knew everything until I was about 21, and then my parents got a lot smarter somehow. Never did figure out how that happened.

These comments have me thinking. I still do not know how a 15 cubic foot box interacts with a 25-foot sound wave, but I will just have to sharpen my research. I seem to be reading contradictory things, but there plainly has to be an answer. The designs work, but I do not understand it on a physical basis. The IB discussion got me doing research because I never understood what the was, and I found an article by Eric Santanen, who is a processor at Bucknell University with an IT background. http://www.facstaff.bucknell.edu/esantane/movies/sub.html What interested me was that he originally developed a sonotube sub . From what I have seen, an IB sub would be a lot easier but maybe I am missing something. It does not seem like it would require the HS-24. I may seem to be jumping around here, but it feels more like a progression to me. I have been paying attention to the comments and trying to make sense of them. An IB sub very well might satisfy my urge to try something different with a lower risk of complete failure.

@CECAA850 my question is what effect the internal structure has on 20-40 Hz sound waves. Maybe that is not the point, and they are designed to redirect air, but acoustically, can anything in a box that size have any effect on around waves. I can see some refraction, but not sure what they accomplishes. Sound waves that pass through concrete walls are going to pass through wooden mazes without noticing. I do not mean this as a criticism or a statement based on knowledge, but as a real question. When I talked earlier about sound absorption, you responded that there was no way that the soundply product was absorbing low frequencies because it is impossible. So how can a little box do it? And how can the back of a little box stop 28-foot sound waves? Maybe there is an answer, but what is left of the physicist in me is not seeing it.

OK here is a question that I don't understand, and @CECAA850 pictures present it clearly. A 20 Hz sound has a 56 foot wavelength. It will pass through concrete or steel walls. Because its size, should pretty much ignore anything under 14 feet or so under the quarter rule. I read that the enclosure is in part to trap the back sound and prevent it from escaping, but I don't see how that box is going to do anything to a 56 foot wave. 40 Hz has a 28 foot wave, so not isolated the really low levels. The internal framing would affect the actions of the driver itself, and that would affect the sound,but I cannot see sound bounding around in the box. As always, I might be on a wrong tangent here, just trying to make sense of it. My research lead to diffraction of light, and as interesting as that was, it did not help.

I am very glad for him and hope that he enjoys it. A different trajectory than mine, but I am always delighted to see people succeed in what they want to do.

@wvu80 I posted the question in AVS. http://www.avsforum.com/forum/113-subwoofers-bass-transducers/2957818-32-inch-subwoofer-driver-dilemma.html#post55707048

Sure hope so., I am trying to reach out to him on many platforms.

Some of the Electro-Voice EV 30W have sold for as little as $400 on eBay. I have just been waiting for a pair. There is a pair pending on usaudiomart for $1800, but that is a bit rich for me. Lots of solds around $800, not sure if they are pairs. I would like a pair for an open baffle speaker.

Nope. I checked. No one seems to have a 48 or even a 36. What is up with this world?

OK not to change the topic, but changing to topic anyway, I have question. I still have a business account with Alibaba that has a good history, so I am able to make deals with sellers. A company called Fante Electric Company makes speakers and subwoofers of every variety, from titanium tweeters to Piezo tweeters to subwoofer drivers. They have a 32 inch subwoofer driver. https://www.alibaba.com/product-detail/16000-Watt-32-Inch-Subwoofer-PD32150B_60589689045.html?spm=a2700.8443308.0.0.suSrMD 8000 Watts RMS, 16000 max. They sell them for $850 to $900 apiece. With shipping at 100 pounds, you are looking at $1,100. They will send me two evaluation examples for $900 including shipping. So for $450 apiece is it worth grabbing a pair of 32 inch subwoofer drivers, or is this so certainly junk that it is not worth it? Knowing me, the idea of my gian subwoofer with 2 32-inch drivers is intriguing.