Overview: The Rockford Fosgate Punch P1S4-15 is a 15-inch
subwoofer with a single 4Ω voice coil. The sub features a StampCast steel
frame, quick-release compression terminals, a Kevlar fiber reinforced paper
cone, and NBR surround (Nitrile Butadiene Rubber). An anodized aluminum voice
coil former and spider venting help keep the subwoofer cool.
Steel Basket: The P1S4-15 subwoofer features a StampCast steel
basket for added rigidity.
Compression Terminals: The P1S4-15 features spring post
terminals which accommodate speaker wire up to 10 gauge.
CEA-2031 Compliant: Power handling on the P1S4-15 subwoofer
conforms to CEA-2031 industry standards. This means the subwoofer has the capacity
to handle power under continuous demand, not instantaneous power handling, that
over time, can damage voice coils.
FlexFit Basket: The Flex Fit frame utilizes slots (where
possible) instead of single screw sized holes; allowing slight adjustment of the
speaker when mounted.
Trim Ring: To improve the cosmetic look, a decorative trim
ring is included that mounts over the flange of the woofer. When using the PVC
trim ring the woofer is first mounted with four screws, then the ring is placed
on top of the woofer, aligning the final four holes of the woofer with ring. The
other four screws are used for these holes to mount the ring and woofer to the
enclosure. The trim ring increases the mounting height of the woofer to 7/8
of an inch.
Sealed Box: Rockford recommends a sealed enclosure with an
optimum internal volume of 1.58 cubic feet (from 1.3 to 3.5 cubic feet is
acceptable). Sealed enclosures provide the most control over a woofer, will
handle a lot of power, and provide accurate sonic reproduction, making them
suitable to all types of music.
Ported Box: Rockford recommends a ported enclosure with an
internal volume of 2.66 cubic feet using one 4" diameter x 8" long
port; this yields a tuning frequency of 34.4 Hz. Ported (or vented) enclosures
typically provide better overall efficiency than sealed so they are suitable
for use with smaller amplifiers, giving you more bass output from less power.
However, this efficiency comes at the expense of very low frequency output
(below 34 Hz).
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