Our Product Research Team
At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere.
That's because we have our own in-house Product Research team — they open the box,
verify contents, check the owner's manual, and record dimensions, features and specs.
We stay on top of new products and technologies to help people make informed choices.
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.
Terminals: The woofer's 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.
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.