I own a pair of 605-B. one of these was blown by a problem in a Luxman amp...it really burned it. ..so well I tried reparing it.
I ordered to Great Plains a recone Kit and a Diaphragm, and where installed by an Altec representer here in Mexico City, and the sound quality of the diapragm, +comparing it with the old one is not even near. donīt know why. Several persons told me Great Plains Audio was the best option. Bill Hanuschak told me there is no reason to the sound to be different, I believe him and since then I have been trying to explain what happened.
The original diaphragm was covered or made with a silver color "tape" around the voice coil, this in the new one is copper color and there is no "tape" just the coil..this causes a small diference between the 2 speakers
the sound in the original one is different and superior...
Does anyone has tried changing the old dipragms for brand new Great Plains Audio ones???