krzys

I asked the same question when I bought my CWII. Very easy take all screws off, lay them face to carpet , remove the binding post cup, use a 2x4 and a hammer to gently force the woofer to fall on the carpet. easy and safe. Chris

You are the man Doctor. It works. The only question is why is that a so well kept secret? Were did you find this pdf ?

Thanks djk. You are right but please see my other post/follow up for expalnation. Diaphragms were stressed due to improper mounting holes position. Chris .

<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /> Analyzing the responses I got for my problem with the 806 I concluded that the diaphragms should be the problem. I got those diaphragms loose, not mounted on the driver I was told they were from PAudio (Taiwanese copy). The bolting holes do not fit the holes in the driver by at least 1/16 in (more then <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" />1 mm). I had to ovalize the holes and the screws were fitted tight. I did it and took the first measurements, the bad ones. I opened the drivers again and made the holes even bigger. After two other trials and measurements I finally got the right results. The 806 are going down close to 400 Hz as expected. See the graph. At the begining the diaphragms were probably stressed and can not move enough to produce the low end. Conclusion: beware of these diaphragms. Number on their box: DWT 044-16 ohm. Chris http://img85.imageshack.us/img85/680/altec806cropedzt5.jpg previous tread: http://forums.klipsch.com/forums/thread/824121.aspx

Thank you SET12, funny is that your shortcut doesn't work either ! There must be a bug in the forum software. It realy sucks, text can not be copied to another program for spelling check and so one. Somebody at Klipsch? I even never found how to contact a webmestre. I found that in the FAQ: Can I add attachments to my posts? Yes, however, this requires the moderator(s) or administrator(s) to enable this permission for users on a forum-by-forum basis For images there is an insert function but seams not work just like the link ! but some members succed, how ? RE system : I'm presently trying an Altec 511B/806 , sound better than the Klipsch original but that's not a news

Can anybody give me the clue? When I'm trying to insert an image in a post I get only a small square symbol. Why ? Chris

Thanks Tom . Your style is very direct as usual but you are at least 99% right ;-)

Do you guys see the graph in your browsers ? I only see it when I edit the post. If it isn't visible does somebody know the why? It is a jpg file. I I'm joining it again.

Carl , the measurments were taken wideband without any crossover. I took those measurment many times and get consistent results. The Klipsch driver was performing as expected , without any drop and was measured in the same time. Both Altec drivers (having same new diaphrags ) performed in the same way. I must admit that I don't hear clearly this drop in my three way system. I also can equalize the driver with the digital crossover (parametric filters available) but prefer minimize the EQ. The most probable cause are diaphragms but it's hard to admit

Interesting thread. I'm wondering if I souldn't sell the 806 as is and get 902 instead. Seems more promising for good sound. Any comments anybody? Is alnico important ? I don't have experience with alnico drivers.

As I know in the early years Altec has sold 511 with 806. The pair I got was original, green painted. In my perception the only diference between 802 and 806 is the magnet size thus the efficiency a bit higher fir the 802. This said I don't think this is the problem I have. The measurments was made at rather low level say 80-83 dB. I made a search in altec heritage forum . The demagentization sometimes occurs if alnico driver is driven very hard and even then the symptom is some loss of efficiency between 1 and 3 dB. Nobody has ever talked about frequency changes.

Speakerfritz If I follow you, you are pointing the fact that the 806 is not well matched with a 511 at low cutoff. Maybe, but lot of people use them even at 400 Hz and I thought that it is true only for PA use when power handling is imporatnt. Chris

I forgot to tell that the measurment was taken with full range mode using pink noise. The general cut off point are as expected ie arrond 500Hz on a horn and some 10 kHz. Next steps : try another diaphragm from Radian or GPA or just jump directyl to a 902 with quality diaphragm. In the meantime I can try the Klipsch driver but will need some holes since I have the three bolt version K57K (I think?). Chris

Shawn thanks for your replay. As I understand it, the phase is out of context since I'm using a digital crossover and all other drivers were muted, no cancelation is possible. Is this behaviour typical of weak magnets ?

Like many others I wanted to try the Altec road for my Klipsch Cornwalls. I got a pair of 511b with 806a 16 ohm drivers. i was told that the diaphragms were replaced with P Audio new ones. I mesured the Altec horns and got some suprising results: There is a hudge hole in the Altec curve beetween 500 and 1600 Hz. I can not imagine that this is a typical response. Does anybody knows possible reasons like week Alnico magnet, bad diaphragm or is that the famous Altec sound ;-) Chris