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CDT Audio QES-820 8"

Being able to meet any one of the three distinct engineering challenges met by CDTAUDIO new 8” and 10” and 12” Minibox Sub drivers would be enough for most competitive models. These engineering masterpieces simultaneously deal with the need to move large amounts of air necessary to overcome the 70+ db. of bass masking road noise in the moving automotive interior, while accurately responding to the delicate changes in the harmonic structure of the music.


All while doing so within an acoustic suspension enclosure that won’t waste the consumers valuable trunk space. Their depth, rugged, non-ferrous cast baskets are coupled with a suspension system which allows the cone and voice coil assembly to move as an exact analog of the electrical signal, while at the same time controlling the limits of excursion and eliminating extraneous motion. Real butyl rubber, though more expensive than conventional materials, has been chosen for the outer surround; it provides far superior control, longer life and excellent damping of the cone edge, and even lowers distortion at the limits of excursion. Superior pole-vented motor structures propel sturdy 2.5” aluminum voice coils for rapid heat dissipation, eliminating the possibility of dynamic compression and lowering of output.


A magnetic system utilizing an aluminum shorting ring above the pole piece lowers modulation distortion to new lows. Corrosion resistant gold 5-way binding posts compliment these mechanical marvels.


By placing subwoofers of this quality in enclosures not much larger than the shipping cartons they come in (as small as .2 cubic feet for the 8” and .45 cubic feet for the 10”) the effective resonance point is raised and the subwoofer performs as if it were in an enclosure many times its size. The advantages of acoustic suspension design are well known: the bass response is free of any boominess or sloppyness and is deeper and tighter by far than produced by any other subwoofer system. In addition, the slower rate of roll-off below the system resonance point provides superior deep bass output, while producing the fastest, most accurate reproduction of musical impulses.



  • Dual voice coil subwoofer
  • Frequency response: 10Hz-400Hz
  • Power handling: 400WRMS (800 watts Pk)
  • Impedance: 2X2 Ohms 
  • Impedance 4 ohms wired in series.
  • Sensitivity: 82dB
  • Mounting depth: 4.41” Cutout diameter:7.25”
  • Cast frame: OD 8.25”
  • Cone: Mixed Kevlar-paper Honeycomb
  • Magnet weight: 82 oz stacked
  • Cone surround: NB rubber
  • Voice coil: 2” (50mm)
  • Fs: 44.1Hz
    $230.00 Regular Price
    $184.00Sale Price