Altec Lansing H-1203B Sectoral Horn Driver
The Altec Lansing H-1203B is a high-efficiency compression driver paired with a sectoral horn, built for professional audio in theater and live sound reinforcement. It is usually tied to systems from the late 1950s to early 1960s. Many units stayed in service and were rehoused or refurbished into the 1970s.
The H-1203B is known for dynamic clarity and high output. It was often used with large-format bass cabinets to build full-range systems for cinema and high-fidelity use. It played a key role in shaping the "West Coast Sound" and was frequently built into Altec systems such as the A7 Voice of the Theatre.
Specifications
| Feature | Specification |
| Model | H-1203B |
| Brand | Altec Lansing |
| Year of Production | Late 1950s – Early 1960s (commonly used into 1970s) |
| Impedance | 16 ohms |
| Sensitivity | 104–108 dB (1W/1m) |
| Power Handling | Not officially rated; system-dependent |
| Driver Type | Alnico magnet compression driver |
| Diaphragm | 1-inch phenolic |
| Horn Throat | 1-inch |
| Horn Type | Sectoral (constant directivity) |
| Intended Use | Professional sound, theater, high-fidelity |
Historical Context
The Altec Lansing H-1203B came out when high-efficiency horn-loaded systems dominated professional sound reinforcement. It was part of Altec's large lineup of theater and studio monitors. It was engineered to deliver clear, punchy midrange and extended highs on very little amplifier power - which mattered, since tube amplifiers of the day offered limited wattage.
Its alnico magnet compression driver gave better transient response and warmth than later ceramic designs, which made it a favorite among engineers and audiophiles. The sectoral horn offered improved horizontal dispersion and consistent coverage, as Altec's professional-grade components generally did.
The H-1203B was often paired with the 515-8G or 515C high-frequency drivers in multi-way systems. It was also a frequent companion to the 604 or 605 coaxial bass-mid units. Movie theaters, broadcast studios and live venues all used it, and it earned a reputation as a reliable, distinctive part of the "Voice of the Theatre" line.
Sound Signature
The H-1203B is known for a lively, forward presentation and high dynamic impact. Its sound signature features:
- Clear, articulate midrange with minimal compression
- Extended, detailed highs with a slight warmth from the alnico driver
- High efficiency, allowing full output even with low-powered amplifiers
- Characteristic horn coloration, often described as "present" or "engaging"
That suits vocals, acoustic instruments, and vintage recordings where immediacy and realism are wanted.
Maintenance and Restoration Tips
Because of its age, the H-1203B often needs inspection and maintenance to perform its best:
- Alnico Magnet Strength: Over time, alnico magnets can weaken. If output seems low, consider professional remagnetization.
- Diaphragm Condition: The phenolic diaphragm may degrade or become brittle. Replacement with period-correct or modern equivalents (e.g., titanium or composite) can restore performance.
- Horn Sealing: Check the throat seal between the driver and horn. Air leaks reduce efficiency and bass coupling. Use high-quality putty or gasket material for resealing.
- Mounting Hardware: Inspect screws and flanges for corrosion or stripping. Replace with stainless steel hardware if needed.
- Cleaning: Use mild cleaners on the horn surface; avoid harsh solvents that can damage the finish or phenolic components.
Restorers often match H-1203B units in pairs for stereo or bi-amped setups, which significantly increases their value and usability.
Market Value and Collectibility
The Altec H-1203B holds steady appeal among vintage audio collectors and DIY speaker builders:
- Market Value: $200–$500 per unit, depending on condition, magnet strength, and originality
- Matching Pairs: Command premium prices, especially when tested for frequency response and sensitivity
- Collectibility Rating: 7/10 — High among professional horn enthusiasts, though less mainstream than complete Altec cabinets
Units with original labels, unmodified drivers, and clean horns are the most desirable. Their use in modern high-efficiency speaker projects keeps demand up.
Conclusion
The Altec Lansing H-1203B stands as a testament to mid-century American audio engineering—efficient, robust, and sonically vibrant. Whether used in a restored Voice of the Theatre system or a modern horn-loaded design, the H-1203B delivers a compelling listening experience that captures the essence of vintage professional sound. For collectors and audiophiles alike, it remains a worthy component of any high-fidelity pursuit.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.
Related Models
- Altec 1214A
- Altec 1224A
- Altec 1590B
- Altec 1592A
- Altec 1594A
- Eico 3150 (1967)
- Fisher CUSTOM-ELECTRA-I (K-14/K-15) (1957)
- Fisher CUSTOM-ELECTRA IV (E33/E44) (1960)
- Akai AM-2400 (1978)
- Akai AM-2600 (1977)