JBL E145 (1970s)

Name: JBL E145
Brand: JBL

A 15-inch pro woofer with a four-inch edge-wound coil and a white aquaplas cone. DIY horn builders have been hoarding them for decades.

Overview

The E145 is a 15-inch woofer from JBL's E-Series transducer line, the professional sound reinforcement and studio monitor driver family the company fielded in the mid-1970s. It has a four-inch edge-wound aluminum flat-wire voice coil in an Alnico V magnet assembly, on a cast aluminum frame. The cone is the white aquaplas-coated paper JBL used across its pro drivers of the era. The surround is a cloth roll. JBL designed it to work in vented enclosures of 5-8 cubic feet or sealed boxes of 3-5 cubic feet. That is a generous window, and it explains why the driver turns up in so many different cabinet designs.

The numbers that show up consistently in the record are 8-ohm nominal impedance, 150W power capacity, a useful range of 35-4000 Hz, and 96 dB sensitivity at 1W/1m. That last one matters most in practice. At 96 dB the E145 makes serious noise off very little amplifier power, which is why it found a home in horn-loaded two-way systems. The top end goes to a compression driver, and the woofer only has to carry the bottom few octaves. Weight is cited as 23.5 lbs and about 24 lbs depending on the source. Nobody's shipping quote was ever saved by the difference.

This is a lightly documented driver. No factory datasheet with precise enclosure recommendations survives in the available record. There's no exact original retail price and no complete Thiele-Small parameter set in the sources. What collectors know about the E145 comes largely from owning it, measuring it, and passing the numbers around.

Key Features

Four-Inch Edge-Wound Aluminum Voice Coil

The voice coil is a four-inch edge-wound aluminum flat-wire winding. The former material varies by source: glass-fiber in some accounts, Kapton in others. Forum measurements put the coil at .280" long in a gap of 0.600", and one source quotes 7mm of Xmax from JBL data sheets. The old hands at JBL were candid about the era's methodology. Xmax wasn't paid much attention back then, and there was no standardized way of stating it. Treat any Xmax figure for this driver as approximate.

Alnico V Magnet and Cast Aluminum Frame

The magnet assembly is Alnico V in a cast aluminum frame, the classic JBL recipe. The period documentation also says the E145 shares its magnet assembly and voice coil with the LE-15, which is handy when hunting parts. Alnico magnets of this age can lose some charge over the decades, so a used example's measured output is worth checking against a known-good unit.

White Aquaplas Cone and Cloth Roll Surround

The aquaplas-coated paper cone is the visual signature of JBL's pro line of the period, and it's also the most common cosmetic complaint. The coating is fragile and chips easily on used examples. A chipped cone isn't automatically a dead driver, but it's a negotiating point. The cloth roll surround is the other thing to inspect closely. Surround rot and spider sag are common in forty-year-old drivers of this vintage, and both will change the sound and the resale value.

Vented or Sealed Enclosure Duty

JBL designed the E145 to work in either a vented box of 5-8 cubic feet or a sealed box of 3-5 cubic feet. Builders like that they aren't locked into one alignment. There's no factory datasheet with precise enclosure recommendations in the surviving record, so modern builders tend to work from measured parameters and community knowledge rather than an official JBL alignment guide.

Historical Context

The E145 belongs to JBL's E-Series transducer line, from what the record describes as JBL's most productive era. JBL's own advertising of the period made the usual bold claims. It said the E-Series offered better performance than any other loudspeakers on the market, with particular emphasis on power capacity and a new magnet design delivering high accuracy with minimal speaker distortion. Those claims ran in Modern Recording (October 1981, p.23) and similar trade press. That's marketing copy, not an independent verdict.

The driver saw real system duty. It turns up two-per-box in the JBL 4545 PA system, paired with a 2380 horn and a 2445J compression driver. That makes it low-frequency support in a horn-loaded professional system, not a home hi-fi woofer. No source in the available record states exactly when production began or ended. "Mid-1970s" is as precise as the documentation gets.

Collectibility & Value

Among collectors, the E145 has a solid following as a mid-bass driver rather than a subwoofer. Owners describe it as clean and punchy, and it's frequently paired with JBL 2440/2441 compression drivers in two-way DIY horn systems. One owner has been running theirs since buying it new in 1991, and reports a dust-cap tear on day one that was glued with rubber cement and never caused another problem.

Prices conflict across sources. Buyers should expect anything from roughly $200 - $350 up to $400 - $600 per driver depending on condition. Recent listings have ranged from $200 for a working 8-ohm unit up to $600 for an example described as excellent. Factory recone kits are no longer in production, though third-party kits exist, and reconing with original JBL kits is a documented practice among owners. When buying, inspect the aquaplas coating for chips, check the cloth surround for rot, and confirm the spider hasn't sagged. A driver that measures correctly with no voice-coil rub is the baseline.

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