Altec 3000B

Name: Altec 3000B
Brand: Altec

A featherweight diaphragm in a flexy fiberglass horn—this driver sings with a character some call magic and others call 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 centers on a "very light, delicate microphone diaphragm," a design choice that prioritizes speed and transient response over brute durability. it’s a precision instrument from an era when horn-loaded systems ruled theaters and high-end installations. The "B" designation refers not just to the driver but to its companion horn, a later revision made from fiberglass, abandoning the zinc multicell construction of earlier versions. That switch was likely driven by cost and weight, but it introduced a new behavior: the thin fiberglass walls "do seem to be pretty flexy," according to user observations on DIY audio forums.

This flex, combined with the lightweight diaphragm, contributes to a sonic signature that divides listeners. A 1960 Audio Magazine test report used tone burst response—a novel technique at the time—to probe its performance, suggesting engineers were already wrestling with how to measure its transient behavior accurately. 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 like those pairing the Altec 414 woofer with the 3000-series tweeter, the 3000B was tasked with handling the top end above 3000 Hz, a critical 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 heart of the Altec 3000B is its diaphragm, described explicitly as "very light, delicate," borrowing design philosophy from microphone technology. This construction enables rapid acceleration and exceptional transient detail, allowing the driver to articulate fast musical passages with clarity. However, the delicacy implies vulnerability—both to mechanical stress and to the thermal loads of high-power amplification. It’s a trade-off: speed for robustness. There’s no data on voice coil material or former type, but the emphasis on diaphragm lightness suggests Altec prioritized response time over 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 change likely reduced manufacturing complexity and cost while improving weight distribution. However, the fiberglass construction introduces a new variable: wall flexibility. User reports note the horn has "thin fiberglass walls" that exhibit noticeable flex. This structural compliance can modulate the acoustic output, potentially contributing to the "ringing" behavior observed in time-domain measurements. Unlike rigid metal horns, which aim for neutrality, the 3000B’s horn may actively participate in the sound—coloring it with its own resonant characteristics.

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—those made from zinc and featuring multicell geometry—are described as "more collectible" than the fiberglass "B" variant. The 3000B itself appears sporadically in the secondary market, often with caveats: one non-working unit was listed for sale "AS IS" on Worthpoint, indicating limited demand or confidence in functionality. No original pricing, production years, or current market valuations are documented, leaving collectors to navigate 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.

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