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kg4guy

New diaphrams in Driver

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I put new diaphrams in a pair of Altec 806's and one sounds awesome and the other sounds muffled? Any idea whats up I switched them from side to side to make sure it wasn't a problem with the crossover and it was the same.

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I would take it back apart and inspect everything. Did you have any trouble installing it?

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I did all that and I did notice the diaphram wasn't all the way flush with the driver both times until I screwed it down so I am assuming that it may be bad?

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That doesn't sound right. Maybe one of our resident experts will chime in.

A good picture is worth a thousand words.

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After the fourth time taking apart and looking over what I did I fixed it.These drivers have loading caps and there is only one way to put the diaphram in because only 3 of the holes are deep enough for the loading cap screws so I put the diaphram in another position and then used washers on the loading cap screws so they would fit in the diaphram screw holes.The diaphram fit more flush this way and so far sounds 95 % better.I would post photos however my camera is messed up. Thanks

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Good deal. Glad it worked out for you. Did you end up modifying the 511b horns? How did that work out?

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I didn't I sold the 288's and got 2 pair of 806-8a's as I didn't want to wreck a nice pair of 511b's trying to modify them and the 806's are a big improvement over the K-55's so I am happy.I need to do some crossover mods as I am running them with a type A with 12uf Hovland caps and a 2.2 Mundorf Supremes. I will use a 10.5 cap and a 1.2 cap that should bring the crossover up to 500hz + and the highend up around 6000hz. Thanks

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OK, cool. I suspect you also had to play with the attenuation quite a bit going from not only different drivers but also dropping from 16 to 8 ohms on the squawker.

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I moved the squawker from tap 4 to 3.They sound nice however I wanted to bring the crossover point up between 500-600 Hz as the power handling of the 806's below 500Hz aren't as good as the K-55's[*-)]

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