I have 2 Dynaco A-25s. When I put on a Radiohead LP or something with hard techno drums or sub bass I hear a crappy bass flap sound out of one of the woofers. Is the Woofer done? Voicecoil or cone? When I push on the cone I might feel a faint rub but barely or not much hard to tell. It is subtle. Woofer looks brand new.
I am assuming this is a common problem. What can I do to fix? Can it be repaired? Crossover caps are original so are the woofers in both I believe. If I listen to the average LP with Bass UP I do not hear this. Just when I put an LP on with Harsh Electronic drums. THe other side does not do this and I have swapped speaker so I know it is not the amplifer. 2 dynaco Mk4's and Pas Preamp. Any advise appreciated.
Also Side Question, Is there any benefit to changing the 5uF caps in the crossover? I have heard of electrolytics drying up but do these unpolarised caps really do that? Tweeders seem to sound fine.
thx
