Ok.. you know I can post exploded view pics of these black 325's I have if someone wants (I bought these brand new in 1993 or 4.) But the construction is as follows:
The main part of the driver housing (the larger part, the part that retains the mesh and that connects to the headband arms) is *black aluminum*. The second smaller part of the 'housing' (that slides into the metal part, the part that the earpads attach to and that includes the speaker itself) is black plastic. This plastic part is very much smaller in size than the metal part, and the plastic part slides INTO the aluminum part.. basically all you see of it is about 1/16 inch and then the flange that the earpads hook on to.
Once you separate these pieces, you can see that the wire mesh is retained in its place by an aluminum bushing, which presses the mesh tight from behind and is then glued in place. Removing the glue around the bushing enables it to slide out, and also allows the mesh to be taken out. The back of the speaker magnet was blacked out with a magic marker at Grado (you can tell by the traces and by the slightly purple color.) I didnt try to remove the speaker, and I would never try that. If I had a speaker problem I would send the lot to Grado; maybe have them upgrade the speakers while they were at it! But I dont expect problems obviously.
I bought these around the time just after the first Stereophile review of the HP1. Stereophile is based here in Santa Fe, and that review really got me hungry for the HP1. But none were available locally, and Albuquerque shops only had the 325 so I went that way.
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