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CDT Audio QES-820 Eurosport 8" 400 RMS Audiophile SQ Subwoofer 4 Ohm
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QES 820
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Thunder AV Price: $299.99
Detailed Description
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.
Technical specs and contents:
1 e/a 8 Subwoofer
Frequency response 10Hz-400Hz
Power handling: 400WRMS (800Watt Pk).
Impedance 4 Ohm
Sensitivity: 82dB
Mounting depth: 4.41 Cutout diameter:7.25
Cast frame: OD 8.25
Cone: Mid/Kevlar-paper Honeycomb
Magnet weight: 82 Oz stacked
Cone surround: NB rubber
Impedance: 4Ohm
Voice coil: 2 (50mm)
Fs: 44.1Hz
All while doing so within an acoustic suspension enclosure that wont 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.
The air held in the box acts as a permanent, unchanging spring that together with the drivers unvarying moving mass, determines the bass response characteristics of the subwoofer system. This method is far superior to designs that must depend on the subwoofers mechanical suspension spring tension, which constantly changes with time and use, and therefore changes the response of the subwoofer. By taking the natural sound, mature approach and designing for tight, clean, musically oriented bass, the subwoofer is proof positive that bass in the car doesnt have to be loud, boomy and sloppy.
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