 
上面是PRO4AA
 stereophone specifications 
 
Frequency Response: 10-25,000 Hz
Impedance: 250 ohms
Weight: 21.0 oz.
Sensitivity: 95dB SPL/1mW 
  Distortion: <0.1%
Ear Cushions: 
Cord: Coiled, Single Entry, 10ft
Plug: 6.4 mm 
 
 
PRO4AAT
stereophone specifications 
 
Frequency Response: 10-25,000 Hz
Impedance: 250 ohms
Weight: 21.0 oz.
Sensitivity: 95dB SPL/1mW 
  Distortion: <0.1%
Ear Cushions: 
Cord: Coiled, Single Entry, 10ft
Plug: 3.5 mm/6.4 mm 
 
Titanium coated high polymer diaphragm for accurate sound reproduction
Oxygen free copper voice coils for signal clarity
這兩隻規格幾乎一樣
大概就差在外型
插頭的尺寸 
