Так и есть. Там динамики по 1$.
Вот фото авторской лаборатории. Все по канонам
Вот это тестируют на фото. Вот вам и Китай
SPECIFICATIONS
General Specifications
Nominal Diameter 250/10 mm/inch
Rated Impedance 16 ohm
Nominal Power handling1 300 Watts
Program Power2 600 Watts
Sensitivity(lw/lm)3 95 dB
Frequency Range4 61.5-3.5K Hz
Minimum Impedance(Zmin) 15.2 ohm
Voice Coil Diameter 75/3 mm/inch
Voice Coil Material Copper Clad Aluminum
Voice Coil Winding Depth 17 mm
Number of layers 2
Magnetgap depth 10 mm
Cone Shape Curved
Surround Shape M-roll
Basket CastAluminum
Flux Density 1.0 T
Magnet Material/Mass Ceramic/2.15 kg
Thiele-Small parameters
Resonance frequency Fs 61.5 Hz
D Cresistance Re 12 ohm
Mechanicalfactor Qms 7.75
Electricalfactor Qes 0.44
Totalfactor Qts 0.41
Mechanicalcompliance Cms 0.16 mm/N
Mechanicalresistance
of suspension losses Rms 2.05 mechk-ohm
Effective Moving Mass Mms 41 gr
Half-space efficiency Eff 1.5 %
BL Factor BL 21 T.m
Equivalent Cas air load Vas 29 liters
Effective pistonarea Sd 0.0356 m2
Max.linear excursion Xmax 6 mm
Voice-coilinductance LelK 1.27 mH
Mounting Information
Overall Diameter 261 mm
Bolt Circle Diameter 245 mm
Bolt Hole Diameter 6.5 mm
Baffle Cutout Diameter 231 mm
Overall Depth 114.5 mm
Net Weight 7.3 kg