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The power-handling capability of any woofer
is related to both its ability to dissipate heat
and the maximum excursion limits of its
cone. Once the speaker’s voice coil moves
outside the magnetic gap, power can no
longer be converted into motion and all the
amplifier’s power is converted into heat in the
voice coil. This voice-coil heating is the
largest detriment to speaker longevity, so
overexcursion should be avoided. Since
speaker- cone excursion is different for each
type of enclosure, power handling is different
for each enclosure.
Sealed enclosures exert the most control
over the motion of a subwoofer because the
air inside the box acts like a spring against
the motion of the woofer cone. Larger boxes
allow for more excursion, thus providing
more low-frequency output for the amount of
power used. When placed in a sealed box
much larger than the Vas of the subwoofer, it
will perform as if it were in an infinite-baffle
installation.
Vented and bandpass enclosures have the
lowest amount of excursion for the amount
of sound output. This is a result of port out-
put reinforcing the sound output from the
woofer. The mass of the air contained in the
port provides an acoustic load on the
woofer’s cone at the tuning frequency, and
this added mass decreases woofer-cone
excursion. Vented boxes do not provide ade-
quate woofer control when driven below the
tuned frequency (Fb), so proper design is
important. A vented bandpass box will have
the lowest overall cone excursion provided a
subsonic filter is used.
• Voice-coil overheating and burning due to
overexcursion are often caused by
overdriving an amplifier into “clipping.”
A severely clipped signal, or square wave,
contains nearly twice the power of a clean
sine wave at the same level. Bass that
sounds broken up and distorted at higher
volumes is usually indicative of an
amplifier that is clipping and being asked to
deliver power beyond its ability.
• Infinite-baffle or “free-air” mounting
applications allow for greater cone excur-
sion than subwoofers mounted in an enclo-
sure. In order to compensate, the power
handling of the subwoofer will likely be half
its rated power in this application.
• Study the excursion curves on the enclosed
Reference Series data sheet and note the
differences for different enclosure applica-
tions. The type and size of box used will
produce different excursion demands on
the enclosed subwoofer and, consequently,
different levels of power handling. As long
as the recommended enclosure parameters
are used, the subwoofer will perform
properly in its enclosed environment.
However, any design deviation may result
in less than optimum performance, and
may also subject the subwoofer to over-
excursion (i.e., where the voice coil leaves
the gap) that can eventually damage the
speaker. For additional help with this issue,
please contact your authorized Infinity
dealer.
SPECIFICATIONS
1030w 1230w
Diameter: 250mm 300mm
Sensitivity @ 2.83V/1m: 88dB 90dB
Power Handling: 250W RMS, 1000W Peak 300W RMS, 1200W Peak
Frequency Response: 25Hz – 400Hz 23Hz – 400Hz
Impedance per
Voice Coil: 4 ohms 4 ohms
Voice Coil Diameter: 51mm 51mm
Mounting Depth: 140mm 159mm
Overall Diameter: 264mm 315mm
Cut-Out Diameter: 235mm 286mm
Basket Displacement: 2.3 l 3.1 l
A valid serial number is required for warranty coverage.
Features, specifications and appearance are subject to change without notice.
POWER-HANDLING LIMITATIONS
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