Altec 3000B

A featherweight diaphragm in a flexy fiberglass horn. Some people call the sound magic and others call it a mess.

Overview

The Altec 3000B is a compression driver, more precisely a horn tweeter, built for high-efficiency sound reproduction when clean, loud highs were in short supply. It uses a "very light, delicate microphone diaphragm," a choice that favors speed and transient response over durability. It's a precision instrument from an era when horn-loaded systems ruled theaters and high-end installations. The "B" designation refers to the driver and also to its companion horn, a later revision made from fiberglass, which dropped the zinc multicell construction of earlier versions. That switch was likely driven by cost and weight, but it brought a new behavior. The thin fiberglass walls "do seem to be pretty flexy," according to user observations on DIY audio forums.

That flex, combined with the lightweight diaphragm, gives the driver a sound that divides listeners. A 1960 Audio Magazine test report used tone burst response, a novel technique at the time, to probe its performance. Engineers were evidently already wrestling with how to measure its transient behavior. Some owners report a persistent "ringing," a resonance that lingers after the signal stops. Cumulative Spectral Decay (CSD) measurements by a user known as "Zilch" show "weird tails," visual evidence of this energy storage. Whether that's a flaw or part of its charm depends on who you ask. In systems pairing the Altec 414 woofer with the 3000-series tweeter, the 3000B handled the top end above 3000 Hz, a transition zone where any artifacts are easily exposed.

Specifications

Manufacturer	Altec
Product name	Altec 3000B
Exact product name	Altec 3000B compression driver
Product type	Compression driver
Product type	Horn tweeter

Key Features

Very Light, Delicate Microphone Diaphragm

The diaphragm is the core of the Altec 3000B. It is described as "very light, delicate," and borrows its design thinking from microphone technology. That construction allows rapid acceleration and exceptional transient detail, so the driver can articulate fast musical passages with clarity. The flip side is vulnerability, both to mechanical stress and to the thermal loads of high-power amplification. It's a trade of robustness for speed. There's no data on voice coil material or former type, but the emphasis on diaphragm lightness suggests Altec put response time ahead of power handling.

Fiberglass Horn (Non-Multicell) in the "B" Version

The "B" revision replaced the earlier zinc multicell horns with a simpler, non-multicell design molded from fiberglass. This likely reduced manufacturing complexity and cost while improving weight distribution. The fiberglass brings a new variable, though: wall flexibility. User reports note the horn has "thin fiberglass walls" that flex noticeably. That compliance can modulate the acoustic output, and it may contribute to the "ringing" seen in time-domain measurements. Rigid metal horns aim for neutrality. The 3000B's horn may take an active part in the sound and color it with its own resonances.

Ringing Behavior and Time-Domain Artifacts

A recurring theme in user experience is the driver’s tendency toward "ringing," a resonance that persists after the input signal ceases. This is not mere anecdote—measurements show "weird tails on the CSD," indicating energy decay anomalies in the high frequencies. The 1960 Audio Magazine test using tone burst response suggests this behavior was detectable even at the time of release. Whether this is a design limitation or an artifact of the horn’s flexibility remains undocumented, but it’s a trait that modern users either seek to mitigate with damping or embrace as part of the Altec 3000B’s vintage character.

Collectibility & Value

Earlier versions of the horn, the zinc ones with multicell geometry, are described as "more collectible" than the fiberglass "B" variant. The 3000B itself turns up sporadically on the secondary market, often with caveats. One non-working unit was listed for sale "AS IS" on Worthpoint, which suggests limited demand or confidence in functionality. No original pricing, production years, or current market valuations are documented, so collectors are working with a thin and poorly defined market. There is no data on spare parts availability or repair pathways, and no information on common failure modes beyond the noted ringing.

eBay Listings

Altec 3000B vintage audio equipment - eBay listing photo 1

Altec Raw Driver Ad, 1957, 803a,3000b,811b,511b,802d,500d,80

$9.99

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