starting with the topology of the motor, that's not a standard arrangement in which the flux path has one loop equating to one gap, this has 2. I call it a floating gap. the bottom gap is apposed to the top and the coils run in a push/pull formation. when one coil winding leaves one gap and begins to enter another, a breaking occurs by the opposed flux path being opposite polarity of the originated gap thus keeping it from over travel and mechanical damage. not that I see that happening anyways considering the spider diameter is larger then the standard 8" and 10" (there 12" due to the 5" coil with very healthy progressive roll)
the coil its self surpasses round wound or flat wound via edge wound method. this is more efficient when it comes to maximum coil density without causing excess air pockets between layers and increase inductance from the layers interaction with the core.
the coil is also ceramic toughened with a thicker then standard coil former. this helps with heat and structural integrity.
the coil is single 1 ohm (there wired internally together) yet theres two sets of leads. this is common SQ practice to keep the stresses and weights even on the spider. it costs more to do but pays off in the klippel testing.
the frame acts as a heat sink as does the above and below gaps structures. they also reduce modulation.
the cone is more or less a rohacell copy. very strong yet very light. this helps with accurate tonal reproduction under high excursion.
and the 19" portion, that helps make it a true 18" cone in terms of area. not perfect but helps. im sure it was also done for proprietary reasons for recone prevention outside of Rockford. id rebuild it with an adapter my self
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Fuck you papermaker
2014 Ford Fusion SE 2.0T
DD M1c, DD SS4A
Knuconceptz OFC, Custom fit Soundrive RCAs.
that I agree on. each part I mentioned has its ups and downs. the key is that most the mentioned isn't for "loud" purposes
Hu: kenwood kdc-x995
Sub: Boston acoustics G5 12 in a quasi 6th order
Amp: Phoenix gold zx600.2 ti
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97 4 dr. Tahoe
CDT KA-61 comps
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2 Sundown Audio X 15's Tuned @ 30Hz.