Pioneer Reference Series DEX-P9R - Manual (Page 18)

142
Ш278
Ш318
TS-W304F 30 CM F-TYPE SUBWOOFER
❚ Voice Coil Cooling System
Pioneer’s Voice Coil Cooling System (VCCS)
brings added power to the world of audio
subwoofers. Strong solid bass requires electric juice to get it going.
Since the situation can get pretty hot, the heat has to go
somewhere. This is where VCCS technology steps in. As voice coil
temperatures rise, so does resistance. Unfortunately, increased
resistance affects the damping factor and creates distortion. VCCS
takes the heat away from the 4- or 2-layer voice coil using a heat-
resistant, highly conductive aluminium bobbin which enables
increased power and tonally accurate sound. Plus, extra slits in the
bobbin reduce eddy currents while radiating the heat, which further
lowers the temperature of the voice coil. Problem solved, thanks to
Pioneer technology.
68
subwoofers
600 W
Max.
i
131
Ш238
Ш269
TS-W254F 25 CM F-TYPE SUBWOOFER
500 W
Max.
i
30 cm 25 cm
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30 cm 25 cm
38 cm 20 cm
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18 – 2,000 Hz 18 – 2,500 Hz 20 – 2,000 Hz 20 – 2,500 Hz 18 – 1,500 Hz 25 – 3,000 Hz
35 Hz 37 Hz 32.3 Hz 39.2 Hz 32.3 Hz 64.7 Hz
0.34 0.351 0.541 0.765 0.768 0.875
42.5 28.3 – – – –
51.45 24.88 86.7 36.16 198.8 9.74
89 dB 87 dB 94 dB 92 dB 95 dB 91 dB
400 W 350 W 300 W 250 W 200 W 120 W
Subwoofers TS-W305C TS-W255C TS-W304F TS-W254F TS-W383F TS-W203F
Interlaced Aramid Fibre Reinforced IMPP cone
Wide-roll, 3-layer fibre woven radial surround
Foamed IMPP cone subwoofer
with dual-layer Urethane edge
Foamed IMPP Seamless cone subwoofer
with dual-layer Urethane edge
Cone-integrated, moulded diamond plates
VCCS (Voice Coil Cooling System)
Direct-to-cone voice coil mounting ring
Dual mass high power magnet
Direct bobbin mounted Aluminium centre cap
Extended and vented pole yoke
Vented and monocoque projected pole yoke
Lead wires integrated large diameter Conex double damper
with dual damper ring
Conex damper with damper ring
Enclosure use
Free air use
Frequency response
Lowest Resonance Frequency (Fs)
Qts
Recommended Sealed Enclosure (Litres) (± 10 %)
Vas (Litres)
Sensitivity (1 W/1 m)
Nominal input power