boom3

Maybe we can bring this horse to the barn, I for one hope so since my original question has never been answered, even with some speculative, albeit entertaining, tangential commentary. If you look at DFH, Vol 2, No. 12, 10 Nov 1961, Paul said: "A minor cause of loss at 400-500 cps was traced to driver unit variations within types and between types. This was minimized by a change in throat structure involving a multitude taper. This was investigated in 1953 but improvement was not then regarded as significant. Considering the driver variations and the minimizing of effect with the throat change, it was desired [sic] advisable to be put into production. Woofers with the change are designated "G" thus K-3-G means Klipschorn woofer unit, G modification" In DFH Vol.12, No.5, 25 Oct 1972, revised (in price only) in June 1974, "Updating Klipschorn Loudspeakers", Paul said: "There was a change in woofer horn throat structure about 1963...the "Type G motorboard" may be retrofitted to improve response in the 20-400 Hz range..." In a 1970s letter (not extant) to me, Paul called this change a 'plug'- in his original quotes- that smoothed response at the upper end of the bass horn's range. I did not, nor do I now, take the 'plug' usage as phase plug in the classic sense. One more time, does anyone actually know what the Type G is, and what it replaced? I have asked the factory...they don't know at this point.

From a previous thread: *** D-MAN: (quoting) boom3: Corvette, re: wood wedges in the throat: This refers to a thread about the "splitter" facing the woofer that is the first division of the two parts of the horn. I think this is the Type G Motorboard upgrade that appeared sometime in the 60s. Paul told me that the 'splitter" improved performance at the top end of the horns ranage, so the action is rather like a phase plug in a HF horn. I'd like to see that thread again myself and take the time to review current thought on it. Dman: Good heavens, NO! None of the above! The throat splitting wedge existed well before the 60's. See attached 1957 Klipsch brochure showing a cut-through Khorn and note the splitting wedge in the (at the time 6x13") throat. Also, it is a hard-surface 45 degree reflector, not a phase plug! No phase correction going on there - let me ask, how is it correcting phase issues? Well, it's doesn't and it never has and never will! Also in 1962, when Klipsch switched to the from the EV woofer to the CTS, the throat cavity was experimented with, and ended up being narrowed to the 3x13" that we see today. Some Khorns left the factory with additional wedges (evidently experimental) in the throat area AS WELL AS the traditional splitting wedges. I want to say that forum member LarryC had a pair, if I remember correctly. He removed them - they sounded BAD. DM My reply: Soooo...what was/is the Type G Motorboard ?...and what, pray tell was Paul talking about...I'd like to think he knew his own design... *** Now: Does the current thread answer this question?

I know this is not esoteric stuff...but I have good results with NuFinish. I tried EagleOne carnuba wax at the suggestion of a friend. Hs car is garaged, mine is not. I think the subtropical sunlight breaks down the carnuba too fast. The NuFinish holds up much better. Speaking of glass, there used to be a product called Glass Wax that was very effective, but not sold as a rain repellent. I have not seen it lately, though. What do yall use on exterior black rubber and plastic? Seems like all the black exterior plastic I've seen turns gray after a few years.

Not any more. The LS and K-horn are made from a mixture of birch plywood and MDF. The Heresy and Cornwall are MDF.

Plywood by itself is a poor choice for speaker boxes. It has been shown to be almost acoustically transparent at some frequencies. MDF is a much better material, but as discussed, does not hold screws well in the edges. I used a sandwich of void-free plywood over particle board (in 1983, MDF was difficult for home builders to obtain) and had a 1 1/2 inch wall, very solid box for two 12 inch woofers. Today I would use decorative plywood over MDF or just veneer over MDF for a direct-radiator box. I have heard the remark that "if the K-horn is made of plywood, it must be OK to use it for non-horn boxes". Apples and oranges, folks. A folded horn requires compound miters which are difficult to reproduce cleanly, with any strength, in MDF. The horn structure of the K-horn is self-bracing , especially at the throat where pressures are highest. The later Cornwalls went to MDF with improved barcing and are less resonant than the earlier plywood versions.

thanks dtels wife for adding more detail...I get on a roll and I try to stop myself from evangelizing too much aout my hometown...but it needs all it can get! The "steam piano" is called a calliope. The instrument is prounounced kall-LYE-O-pee; the New Orleans street of the same spelling is pronounced kally-OPP (long "o" sound, as heard in "rope", not "opp" as heard in "oppenheimer")

http://www.nps.gov/jela/pphtml/activities.html Many people don't know there is a National Historical park in the French Quarter. If you'd like to take a free walking tour and get the real history, go to the Park headquarters at 419 Decatur and take the tour which starts at 9:30. Space is limited, so being there by 9 am is strongly suggested. You will get the real story of the Quarter, not the BS the buggy drivers or 'haunted' tours spew out. The entrance to the park building from the sidewalk is through a long carriageway, (tunnel) when you get to the courtyard hang a sharp left and that's the entrance to the visitor's center. The center has exhibits, a gift shop, and from time to time has folklife programs of music, crafts and cooking.

The "absinthe" sold in New Orleans is not true absinthe, which has been illlegal in this country for many years. The ingrediant wormwood was what got it outlawed. I think it is still possible to order "real' absinthe over the Net. The best times to visit NO are in early spring, like the April French Quarter Fest just past, and October. FQ Fest is the most 'family friendly' of the festivals. There are various festivals throughout the year. Satchmo Summerfest, coming up in August, is an attempt to lure tourists during the deep heat of late summer. I hear it's great for those seeking jazz without the scale of JazzFest. www.neworleanscvb.com If anyone wants to PM me, I will be glad to give other recommendations. I need to get in a trip there myself, it is now looking like July at the earliest.

I lived in the Quarter in the mid-80s and I return pretty often.

Please let me know if yall plan a New Orleans Klipsch gathering. I return frequently and that would be an excellent reason. How was the show at the Clover Grill? It is usually just as, if not moreso, entertaining as the clubs.

If you are using the stock network, or an updated clone, look at the schematic and see the taps taken off autotransformer, that's the attenuation for the mid and tweet. I'm not sure what the attenuation is in dB, I'd like to know myself. The relationship between the taps and dB of attenutaion has been posted here, maybe a search will find it. It may be easier just to Ask Bob, I'm sure he knows off the top of his head. []

just a correction here...my table saw is a Ryobi, not a Makita

I also have 1986 Cornwall IIs-four to be exact. My listening room is 15 x 25 with a vaulted ceiling. The front two are pulled about 2 1/2 feet away from the corners. The back two are pretty much in corners due to flanking furniture. I find the CW IIs to be sometimes tubby on the low end thanks to a peak at 80 Hz. With the front two into the corners, the tubbiness was very prominent. I have never found them to be lacking on the top end. By comparison to Heresies, the CW IIs will sound smoother on the top due to better midranges and tweeters. I find the Heresy Is to be somewhat shrill and perhaps that is the difference you are noticing. How 'live' is your room? My room has a rug over 50% of the floor, but bare floor everywhere else. About 50% of one long wall is open to a hallway. I would suggest playing FM interstation noise at a moderate volume through the Corns and listening to each driver to ensure they are all working. I also use a Yamaha theater receiver with their "YPAO" equalization system. I find it to be a slight difference in balance but I think it helps. Colter is also a user of Yamaha with Corns so I am hoping he will join in.

Wow, what a response! Thanks yall![]

Does anyone have any experience with sliding miter saws that have a 12 inch capacity or greater? "American Woodworker" liked the big Makita with laser sight. I think Rigid has come out with one that will cut a 16 inch board. I have a Makita table saw right now that I rarely use. It has been a pain to set up and needs to be aligned just about every cut. It's miter gauge is flakey. It is also taking up a lot of floorspace in my garage. I also have a Delta 10 inch miter saw that I like a lot. I'm thinking of selling the two and buying a slider. Any advice welcome! TIA!

itunes. I live in a Mac and Win household, so I use iTunes on the WinBox to play background music in my study (if I am not listening to my secondary sytem) and use the Mac to interface with the iPod that I use on long trips in the car or airplane. QuickTime is my preferred multimedia player. I stay as far from RealPlayer and Windoze Media Splayer as i can.

The easiest way is also low-tech. Get a phone pick up, which is just an inductor that attaches via suction cup to handset on the backshell of the earpiece. Plug into tape recorder. RS used to sell these. If you can't find one, you can make an acceptable one by using small iron-core inductor and taping it to the backshell, then using patch cords to connect it to your tape inputs.A cassette recorder is probably best. Then you can pull it into iTunes or other digital ware and equalize and edit. This technique really works well with the old Ma Bell 500 series desk phones. How it would work with cordless or more modern phones, can't guess.

A partial answer here...because the lower cutoff of a horn depends primarily on its taper rate, you cannot combine multiples of identical horns to get a lower cutoff than the cutoff of each horn. Horn arrays are configured to control distribution and output level. For what's happening in a multicell horn, I suggest you look at Harry F. Olson's works. I think he treated this pretty thooroughly about 60 years ago.

Nope. The new CW III uses the same mid horn as the Heresy, crossed at 800 Hz. It is claimed that the K601 mold is lost and the K601 would be too costly to reproduce. I don't agree, but I am not in charge [] The mid for the Heresy I and Cornwall 1 (and maybe the so-called 1.5?) was the K-55 de jure until about maybe 85 or 86 (Klipsch product page says 86)...then the K57 was used in the CW II, don't know about the Heresey. The tweeter, again, the date is fuzzy, about that same time transitioned from the K77 to the K79. Both the K57 and the K79 were Heppner designs.

The later CW IIs used the K79 tweeter, the 1.5s and Is used the K77...

Looks like yall had a wide array of speakers to listen through..were there any Klipsch Heritage? I am wondering how the 901s and the Apogees (?) liked being driven by tubes...

Concur with what djk said. Also, a toroid is slightly less efficient than an EI style transformer and uses a greater length of wire for the same function. Toroids are self-shielded and for that reason many designers will accept a slight loss of efficiency. Cosmetically, the disk of a toroid looks more "high tech" than the rectangular solid of an EI transformer, whose outward appearence has not changed outwardly in about 80 years.

Your best bet, if I understand what you are asking, is to buy a pair of Cornwall IIs, which went out of production in either 90 or 91. The woofer did not change from the Cornwall I to IIs (and the unofficial 1.5s). If you search this forum the family tree of the Cornwalls has been discussed at great length. Actually, the MDF cabs of the later Cornwalls are less resonant and better braced than the earlier plywood versions. Some of us also believe the midrange and tweeter drivers of the CW IIs are superior to the earlier models. I have not heard the CW IIIs yet. However, a number of us feel that the new midrange driver, borrowed from the new Heresy, is a mistake, and Klipsch should have kept the K601 horn used in the CW IIs .That topic also has been chewed to a fine pulp on this forum. Cornwall IIs generally run 700-1,000 a pair on the usual auction sites. Expect to invest about $250 more in shipping if you can't pick them up. If you want them to arrive intact, they must have professional packaging. I strongly recommend Craters & Freighters

1972 or 1973...a pal became a dealer...

Just listening or watching the daily news...[]