Új hozzászólás Aktív témák

• #22477 Lompos48 nagyúr #56474624 #22476

  Új Válasz 2012-01-21 16:37:15 #22477

  Új hozzászólás

  Összes hozzászólása itt Válaszok az összes hozzászólására itt Válaszok erre a hozzászólásra

  Privát üzenet küldése

  

  Lompos48

  nagyúr

  válasz #56474624 #22476 üzenetére

  A skin effektushoz csak egy idézet:

  To take an extreme example, suppose 10 metres of this wire is used in a speaker cable to drive a speaker with impedance as low as 2 ohms at 20kHz ( fortunately very rare ). The cable will have two conductors giving total added skin effect resistance of 0.056 ohms. In series with the 2 ohm speaker resistance this gives attenuation by a factor 0.97, i.e. -0.24 dB. It has been claimed that response changes around 0.2dB are just audible in direct comparison at lower frequencies, but a variation of 2dB or more may be needed at 20kHz, and so 0.24dB is of no significance. (Few speakers are flat to within even 3dB up to this frequency.) For most speakers with impedance well above 2 ohms at 20kHz, and using cable lengths much less than 10 metres, even 1mm diameter is usually more than adequate as regards added skin depth resistance, though the d.c. resistance may be a little excessive for long cables, being around 0.04 ohms per metre total for the two conductors.

  A forrás.

Új hozzászólás Aktív témák