You'll think it's the best electrostatic you ever heard. 
But it's dynamic! The SM-700 Studio Master We designed the Studio Master to
  compete head-on with electrostatic headphones. And many who've auditioned it
  say we've succeeded. 
   
An entirely new driver is fine-tuned with a special duct in the magnet-assembly
  and a critically-sized bypass vent between the voice coil and the diaphragm.
  A newly-developed cushion seals the ear closely, to form a finite acoustic
  chamber with the transducer. 
The results are astonishing! Frequency response is 10 Hz to 20 kHz at ±3 dB,
  Distortion is 0.25 percent. And the dynamic range and transient response are
  extraordinary. All without the inconveniences of the electrostatic types. 
Listen to the SM-700 Studio Master for yourself and see if you don't agree
  it's the best "electrostatic" you ever heard. 
Just remember-it's dynamic! And its price, only $65. 
SUPEREX -- PRODUCTS WITH A DIFFERENCE 
 151 Ludlow St., Yonkers, N.Y. 10705 
(Source: Audio magazine, Oct. 1977
) 
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