Blackmojo a écrit :
C'est quoi le paramètre Dope ?
Du site Weber:
Surround
Context: The surround had that silicon glop on it.
Description: The surround is that area out at the periphery of the cone and usually has from one to three corrugations. Its main purpose is to connect the cone to the rigid basket while allowing the cone to vibrate freely. It also serves to terminate or dissipate the waves or vibrations that travel up the cone towards its periphery. It has its own resonant frequency and can have an effect on the overall frequency response by putting a notch or peak in the response at certain frequencies. The resonating surround can also impart energy back into the cone, producing an audible signal that is often referred to as edge yowl. Since the cone is at its thinnest at the surround, and in the case of a cloth surround, very pourous, it is easy for low frequencies to leak through the surround from the rear to the front and cause some cancellations. This is particularly true in a closed back cabinet where pressure builds up. For this reason, some cones are doped or sealed at the surround.
Some manufacturers dope the surround to suppress the surround resonances, thereby reducing the effect of the resonances (or anti-resonances) on the response of the speaker. A third reason is to strengthen and protect the surround from effects of constant flexing, temperature, humidity, etc. Since the doping reduces the texture and complexity of the sound from the speaker, many guitar players prefer undoped cones.
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