Help required

Wsmatau said:

I recently bought a pair of used Spires. But when I unpacked them I was dismayed to see corrosion on the bridges and rust on the rear screws. Other than that the speakers are very nearly perfect. Is this "normal?" Here is the explanation I was given:

The bridges on the speaker posts are silver plated copper as opposed to gold plated brass that is usually on connector plates. These silver plates give a better connection and also sound better, but silver oxides after five to six months (which is what you see). The good thing about silver is that after it oxidates it does not change the resistance or induction characteristics of the bridges (were as copper oxidates it is more resistance to the passing electrical charge). The rear screws have experienced the same problem, as they are copper screws (high end) opposed to nickel screws (low end). Martin Logan decided to use copper screws because nickel screws have a resonant frequency in the audible range (20hz-20khz) which can be detrimental to the sound. The copper too tends to oxidate within 6-12 months which is what you are seeing.

Can anyone confirm/deny? This is different than what I would expect to see from silver and copper.

Thanks.

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Wsmatau said:

The bridges on the speaker posts are silver plated copper as opposed to gold plated brass that is usually on connector plates. These silver plates give a better connection and also sound better, but silver oxides after five to six months (which is what you see).

Thanks.

Click to expand...