difuzoare

[Vizitator chelloo]

Am si io o intrebare..... am un amplificator de 30 rms pe woofer, vreu sa stiu de ce un dif putere 30 W RMS, 8 ohmi, la jumatatea sarcinii de pe amplificator mai are putin si sare din carcasa iar un dif de 15 w rms si 4 ohmi la aceeasi putere abia se clinteste.... poate sa ma ajute cineva??

[Vizitator]

1: Schimba oricare din parametrii de mai jos, de la un difuzor la altul si vei avea alt comportament...Off-topic: Sau mai pe romaneste, o kia de 2l nu va putea bate un mercedes-benz de 2l, in vecii vecilor, amin!2: Puterea este o chestiune inteleasa extrem de gresit. Puterea este o rata de conversie (de transfer) a unei energii in alta, in cazul asta electrica in mecanica. Puterea simbolizata pe difuzor nu spune ca cel "mic" ar trebui sa aiba o deplasare mai mare a membranei decat cel "mare"... desi ar putea sa fie firesc in unele cazuri extreme, nu e obligatoriu sa se intample asta...in fine, asta e un curs de scoala destul de lung... daca te intereseaza, exista surse...Sper ca ti-am dat un punct de plecare in studiul tau... si ca n-ai nevoie de traducere...Theile-Small Parameters B Magnetic flux density in gap, in Tesla-meters ™ BL The magnetic strength of the motor structure. C Propagation velocity of sound at STP, approx. 342 m/s Cas Acoustical equivalent of Cms Cmes The electrical capacitive equivalent of Mms, in farads Cms The driver's mechanical compliance (reciprocal of stiffness), in m/N D Effective diameter of driver, in meters F3 -3 dB cutoff frequency, in Hz Fb Enclosure resonance (usually for bass reflex systems), in Hz Fc System resonance (usually for sealed box systems), in Hz Fs Driver free air resonance, in Hz. This is the point at which driver impedance is maximum. L length of wire immersed in magnetic field, in meters Lces The electrical inductive equivalent of Cms, in henries L Length of wire immersed in magnetic field, in meters Ms The total moving mass of the loudspeaker cone. Mmd Diaphram mass, in grams Mms The driver's effective mechanical mass (including air load), in kg n0 The reference efficiency of the system (eta sub 0) dimensionless, usually expressed as % p (rho) Density of air at STP 1.18 kg/m^3 Pa Acoustical power Pe Electrical power Q The relative damping of a loudspeaker Qa The system's Q at Fb, due to absorption losses; dimensionless Qec The system's Q at resonance (Fc), due to electrical losses; dimensionless Qes The driver's Q at resonance (Fs), due to electrical losses; dimensionless Ql The system's Q at Fb, due to leakage losses; dimensionless Qmc The system's Q at resonance (Fc), due to mechanical losses; dimensionless Qms The driver's Q at resonance (Fs), due to mechanical losses; dimensionless Qp The system's Q at Fb, due to port losses (turbulence, viscousity, etc.); dimensionless Qtc The system's Q at resonance (Fc), due to all losses; dimensionless Qts The driver's Q at resonance (Fs), due to all losses; dimensionless R Ripple, in dB Ras Acoustical equivalent of Rms Res The electrical resistive equivalent of Rms, in ohms Revc DC voice coil resistance, in ohms Rg Amplifier source resistance (includes leads, crossover, etc.), in ohms Rms The driver's mechanical losses, in kg/s Sd Effective piston radiating area of driver, in square meters SPLo Sound Pressure Level, usually measured at 1 watt, at 1 meter in front of the loudspeaker Vas "Equivalent volume of compliance", this is a volume of air whose compliance is the same as a driver's acoustical compliance Cms (q.v.), in cubic meters Vd Maximum linear volume of displacement of the driver (product of Sd times Xmax), in cubic meters. Xmax Maximum peak linear excursion of driver, in meters