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SW-8-16FR 8" Servo Woofer

The SW-8-16FR is an 8" woofer that has been specifically designed for applications operating in free air, on an open baffle, or in an infinite baffle application. It can also be used in a sealed box designs using .7cubic feet of air space or more per woofer. These woofers can be used as subs or as woofers in a three way design covering a range from 20Hz to 300Hz. 

Driven with the Direct Servo control system this woofer will deliver a level of accuracy and performance beyond other woofer/amp combo currently available at any price. With this woofer system you will hear articulation and resolution in the low bass region far beyond standard passive systems regardless of how well the woofer is made. Distortion levels are also extremely low and well below other sub-woofer designs. 

The SW-8-16FR has a nominal 16 ohm impedance and is designed to be used in pairs (paralleled) or with three woofers all paralleled on a single Direct Servo amplifier. So you can get plenty of output (even in an open baffle design) and without the added expense of additional amplifiers. With two or three woofers sharing the load equally, higher SPL levels can be reached while still maintaining moderate excursions and maintain very low distortion levels.

The high Qts of the compliance plus the added control of the servo will allow this woofer to behave as if it is in an enclosure even in an open baffle design. This level of control is unparalleled.

The Direct Servo technology gives new meaning to the terms fast bass. Fast bass has been a debatable term but really refers to a drivers ability to return back to a resting position. Any other woofer must rely on the suspension alone to allow it to return back to a resting position. Any sub capable of playing down to the 20Hz range will also need a very heavy cone and a really low Fs. The heavy cone and its stored energy from the inertia of its movement make it difficult to quickly return to the resting position. The Direct Servo controlled sub can make use of a much lighter weight cone as the servo system will virtualize the parameters and add output as needed to maintain a flat response to below 20Hz even with a light weight cone that has a higher Fs. Not only does the light weight moving mass minimize the stored energy but the Direct Servo control system effectively slams on the brakes electrically to much more quickly bring the woofer back to its resting position.



 SW-8-16FR parameters:

Mechanical Parameters:

  • Fs =  39.5 hertz
  • Qms = 2.391
  • Vas = .82 cu.ft or 23.23 liters
  • Cms = 0.0658 in/Ib
  • Mms = 1.52 oz or 43.1 grams
  • Rms = 9.87 Ibs/sec
  • Xmax = 16 mm
  • Sd = 32.34 or Dia = 6.42 in or 163 mm

Electrical Parameters:

  • Qes = 1.18
  • Re = 11.6 ohms
  • Z = 16 ohms nominal
  • BL = 10.26
  • Pe = 200 watts (conservitive rating)

Combination Parameters:

  • Qts = .79
  • Sens = 82.7 dB (2.83 V)


Direct Servo amps are available right here.


Your Price: $129.00
Item Number: SW-8-16FR
Manufacturer: GR Research
Manufacturer Part No: SW-8-16FR

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