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$400 · Pair of JBL D130H woofers. (8 ohm) (15”)

Pair of JBL D130H woofers. (8 ohm) (15”) image 1
Pair of JBL D130H woofers. (8 ohm) (15”) image 2
Pair of JBL D130H woofers. (8 ohm) (15”) image 3
Pair of JBL D130H woofers. (8 ohm) (15”) thumbnail image 1
Pair of JBL D130H woofers. (8 ohm) (15”) thumbnail image 2
Pair of JBL D130H woofers. (8 ohm) (15”) thumbnail image 3

The D130 was the second low frequency loudspeaker introduced by James B. Lansing Sound after the D101 of 1946. It was personally designed and developed by James Lansing. It incorporated a 4" flat wire voice coil attached to a light, curvilinear cone with a 4" aluminum diaphragm instead of a standard dust cap to extend high frequency response. The coil was immersed in one of the strongest permanent magnetic fields yet developed for a loudspeaker. It resulted in a driver with outstanding sensitivity, range and dynamic response. The 4" flat wire coil was the single most innovative feature of this design. It was the first low frequency driver to incorporate a coil of this large diameter. To achieve the maximum motor strength, the coil gap was designed to be a very narrow 0.05". The degree of precision necessary to maintain such a large, exact circular shape for both the coil and the gap was unheard of at the time. It was years before competitors were able to match this feat. The advantages of this innovation are many. The large coil dissipates heat more efficiently, increasing power handling and reducing dynamic compression. The large coil also places more wire in the gap for fewer turns. This allowed the coil to use a single layer of wire that could fit in a narrower gap. The result is maximum utilization of the energy from the magnetic structure and maximum efficiency. Finally, the large diameter coil yields a stronger moving structure since the force applied to the coil is transferred to the cone over a larger area. The cone is therefore less prone to breakup. One of these drivers has had the cone/voice coil professionally replaced 5 years ago at great expense, with a genuine factory replacement. Selling the pair only, I might consider shipping.

Ad #
34897853
Posted
November 9, 2019
Expiry
December 9, 2019
Status
EXPIRED
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