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Appendix (A) - HLA Polarity Issues
2251J Low-Frequency Driver: Positive voltage to Red Terminal pin 2+ on the connector plate causes Outward
cone motion
2254J Mid-Frequency Driver: Positive voltage to Red Terminal pin 3+ on the connector plate causes Outward
cone motion
2451SLJ High-Frequency Driver: Positive voltage to Red Wire inside driver cover causes Inward diaphragm
motion. However, positive voltage to pin 4+ on the connector plate causes Outward motion of the diaphragm.
2242HPL Subwoofer: Positive voltage to Red Terminal or pin 1+ or 2+ on the connector plate causes Outward
cone motion
In general, HLA products follow the EIA (Electronics Industry Association) standard of positive voltage connecting
to the Red terminal and causing outward motion, while most older JBL products follow the original (reversed)
JBL polarity standard.
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