Altec Lansing 23746 Compression Driver
The Altec Lansing 23746 is a 2-inch throat compression driver. It was reportedly developed during the 1970s as part of Altec's professional loudspeaker component lineup. It is known for efficiency, clarity and heavy construction. The 23746 was commonly used in studio monitors, live sound systems and horn-loaded high-fidelity enclosures. It helped shape the 'West Coast sound' era, particularly in recording studios and cinema audio.
Specifications
| Parameter | Specification |
| Driver Type | 2-inch throat compression driver |
| Power Handling | 30–50W RMS (system-dependent) |
| Impedance | Reportedly 8 ohms or 16 ohms (model variant dependent) |
| Sensitivity | 95 dB (1W/1m) |
| Diaphragm Material | Aluminum or phenolic (varies by production batch) |
| Throat Size | 2 inches |
| Frequency Response | Optimized for 1.5 kHz – 18 kHz (with proper horn) |
| Recommended Horns | Multicell, sectoral, or constant-directivity horns |
| Terminal Type | Screw terminals or solder lugs |
| Weight | Approx. 3.5 lbs (1.6 kg) |
Historical Context
The 23746 came along when horn-loaded systems dominated studios, cinemas and live venues. It possibly succeeded earlier Altec drivers like the 285 and 286 series, though that lineage is not definitively documented. Compared with those, the 23746 offered better power handling, thermal stability and extended high-frequency response. It was reportedly sometimes paired with multicell horns such as those in the 811 series. It was also occasionally found in systems derived from or inspired by the A7 Voice of the Theatre enclosure.
The driver saw use in broadcast studios and mastering facilities, where it built a reputation for accurate midrange and crisp highs. High sensitivity and dynamic punch made it a good fit for long-throw projection and low distortion at high SPLs. The 23746 became a staple in commercial installations and in high-end audiophile setups, especially among people chasing the 'Altec sound'.
Sound Signature
The 23746 sounds bright, articulate and dynamic, with excellent transient response. It is strongest in the upper midrange and lower treble, with clarity that cuts through dense mixes. With a suitable horn and crossover, it gives smooth dispersion and lifelike vocals. Because it is efficient and has extended response, it can sound bright or even harsh on mismatched horns or poorly designed crossovers. The whole system has to be matched to get balanced results.
Maintenance and Restoration Tips
Like all vintage compression drivers, the 23746 benefits from regular inspection and occasional servicing:
- Diaphragm Inspection: Check for tears, warping, or oxidation. Aluminum diaphragms may corrode over time, especially in humid environments. Phenolic variants are less prone to corrosion but can become brittle.
- Re-diaphragming: Consider professional re-coning or diaphragm replacement if performance degrades. Rebuilt units with modern materials often outperform original factory specs.
- Terminal Maintenance: Clean corroded terminals with electrical contact cleaner. Replace damaged lugs to ensure solid connections.
- Magnet Recharging: If sensitivity drops significantly, the magnet may have weakened. Some specialists offer magnet recharging services.
- Horn Matching: Always use with a compatible horn. Pairing with original Altec multicell horns (e.g., 802 series) yields optimal dispersion and frequency response.
- Crossover Design: Use a well-designed passive crossover with appropriate attenuation. A pad of 3–6 dB is often needed to balance output with low-frequency drivers.
Collectibility and Market Value
The Altec 23746 is moderately collectible, rated 7/10 among vintage audio enthusiasts. Drivers in original condition with phenolic diaphragms, or rare variants, command higher prices. Professionally restored units are also sought after for active use in vintage restoration projects or high-end horn systems.
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Market Value: Anecdotal reports suggest a possible range of approximately $360–$400 per driver, though actual prices may vary significantly and reliable market data is limited; this range is based on unverified asking prices and should be considered a very rough estimate, with some listings observed at higher prices — however, this valuation is not supported by current market evidence and should be treated with caution. Due to lack of verifiable data, the accuracy of this range is uncertain.
Rarity: Anecdotal observations suggest moderate rarity — possibly more common than early 1960s drivers but less so than mass-market consumer units, though reliable production data is lacking and this assessment should be considered highly uncertain.
Conclusion
The Altec Lansing 23746 remains a respected component in the world of vintage professional audio. Its combination of high efficiency, durability, and sonic clarity ensures continued demand among audiophiles, restorers, and sound engineers. When properly maintained and integrated, it delivers a window into the golden age of studio monitoring and live sound — a true workhorse of the 1970s audio landscape.
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