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Woofer: The Pioneer Champion series TS-W309S4 features a
seamless IMPP (Injection Molded Polypropylene) composite cone woofer. The
surface area is approximately 14% larger than last year's model for louder and
higher quality bass reproduction. This process of cone molding assures a
uniform cone thickness for superior linearity and clarity. The cone is lightweight and rigid
for low distortion and superior bass response.
Surround: The surround is made of dual-layer, fiber
reinforced elastic polymer.
Dual Voice Coils: For increased system flexibility, the woofer has two
4Ω voice coils. The two sets of spring compression binding post terminals are side-by-side
for easy wiring. Each post will accept a pin connector, a single banana plug, or bare wire
up to 10 gauge. The two voice coils can be wired in series to present an 8Ω load or in
parallel to present a 2Ω load. Additionally, each coil can be connected to a different
amplifier channel and each channel will see a 4Ω load.
Double-stacked Magnet: The TS-W309S4 uses Double-stacked
High Energy magnets to create a powerful magnetic force. This increases the control exerted over the voice
coil and the power transferred to the cone.
Sealed Box Volume: The sealed box sizes recommended by Pioneer
range from 0.85 ft³ to 1.75 ft³; within this range the ideal size is 1.25 ft³.
Vented Box Volume: The vented box sizes recommended by Pioneer range from
1.25 ft³ to
2.0 ft³; within this range the ideal size is 1.5 ft³. The ideal port size is 3" diameter x
long with a 1.5 ft³ enclosure.
Single Reflex Bandpass Volume: The bandpass box sizes recommended by Pioneer range
from 0.7 ft³ per chamber to 1.1 ft³ per chamber; within this range the ideal size is 0.9 ft³ per chamber.
One 3" diameter x 4.5" long port should be used in an enclosure with 0.9 ft³ chambers.
Power Handling: The woofer has two 4Ω voice coils; each coil can handle
up to 200 watts RMS (400 watts total).