CHOOSINGAN APPLICATIONAND ENCLOSURE
Study the sample curves on pages
5, 6 and 7 and read each explanation
carefully. The charts that follow specify
enclosure volumes and vent dimensions
(where applicable) and indicate the
shape of the response curve both
in-car and out-of-car.
The highlighted combinations will provide the best compromise between low-frequency extension and
flat response and high-output, and are considered optimum. Higher ripple values indicate a Oboomier�
sound and provide higher output at the expense of flat frequency response and low-frequency extension.
PERFECT VQ IN SEALED ENCLOSURES Vb (ft^3)F3 (Hz)Fmax (Hz)Ripple (dB)InsertIn-Car Level @ 20Hz
Kappa Perfect10 VQ and 10d VQ, Sealed
The sample curve below shows typical
0.3581000.3low�2
in-car and out-of-car frequency response0.453100�1low0
curves for a Perfect VQ woofer in a 0.545801mid1
sealed enclosure. The charts that follow0.7542900mid3
135542none4
give some sealed enclosure volumes
infinite baffle2690�0.5none11
that may be used for each of the Kappa Perfect12 VQ and 12d VQ, Sealed
Perfect VQ woofers. The associated 0.4601002low�4
terms (defined below) describe the0.6581000low0
0.7547762mid�2
wooferOs performance in the enclosure.
142620.75mid1
Y Vb � Enclosure volume1.2535502none3
infinite baffle20800none15
Y F3 �Frequency at which the subwooferOs
output is attenuated by 3dB
dBPerfect VQ Sealed
95
Y Fmax � Frequency at which output is at
IN-CAR LEVEL @ 20Hz)
a maximumFMAX (100Hz)
90
Y Ripple � Deviation from flat response
RIPPLE (.3dB)
above roll-off85
Y Insert � Indicates which insert should
80
be used (LowQ, MidQ or none)
Y In-car level @ 20Hz � Indicates level 75
at the lowest frequency. A positive
number indicates a response that 70
rises with decreasing frequency and a
negative number indicates a response65
the falls with decreasing frequency.
(continued)60
55
20Frequency50100Hz2005001K2K
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