Altec Lansing 9815-8A 1-Inch Compression Driver
The Altec Lansing 9815-8A is a high-efficiency compression driver made during the 1970s as part of Altec's professional audio lineup. It was designed for constant-directivity horns such as the 811B. It was widely used in cinema sound systems, public address (PA) installations, and studio monitoring. It is built solidly and sounds clear and dynamic, and it is a late example of the Western Electric-derived driver technology that Altec refined over decades.
The 9815-8A has an alnico magnet structure and a 1-inch phenolic diaphragm. It has a bright, articulate sound that became a hallmark of vintage professional audio systems. People often praise its presence and projection. It needs compatible horns and crossover networks, or the tonal balance turns harsh and overly forward.
Specifications
| Parameter | Specification |
| Model | Altec Lansing 9815-8A |
| Year of Production | 1970s |
| Driver Type | 1-inch exit compression driver |
| Impedance | 8 ohms |
| Sensitivity | ~108–110 dB (1W/1m) |
| Power Handling | Not officially specified (system-dependent) |
| Magnet Type | Alnico |
| Diaphragm Material | Phenolic |
| Voice Coil Diameter | 1.75 inches (estimated, typical for era) |
| Intended Horn Match | Altec 811B, 808, or similar constant-directivity horns |
| Terminal Type | Screw terminals |
| Weight | ~2.5 lbs (1.13 kg) |
Historical Context
The Altec Lansing 9815-8A came out when Altec was a dominant force in professional audio. Altec built on legacy designs from Western Electric and engineered drivers for reliability, high output, and sonic clarity. Movie theaters and live sound reinforcement of the era needed all three.
This driver was commonly paired with the Altec 811B elliptical mouth horn to form the high-frequency section of multi-way cinema speaker systems. Its high sensitivity let tube amplifiers drive it well, and tube amps were still in widespread use during the early 1970s. The 9815-8A also turned up in studio monitor designs and touring PA systems, where its durability and projection made it a favorite among sound engineers.
Solid-state electronics and newer neodymium-based drivers emerged in the 1980s, and Altec's alnico-based models like the 9815-8A gradually faded from mainstream use. Vintage audio enthusiasts, restorers, and audiophiles still prize them for the "classic" Altec sound.
Sound Signature
The 9815-8A has a crisp, detailed high-mid and high-frequency response. It has a characteristic "Altec presence" - a slight emphasis in the upper midrange that helps vocal intelligibility and instrument definition. With a matched horn and crossover, it sounds lively and dynamic.
It is a forward-sounding driver, so improper horn loading or crossover alignment can make it harsh or fatiguing to listen to. Well-maintained Altec horns and vintage-style passive networks give the most balanced performance.
Maintenance and Restoration Tips
Given their age, surviving units of the 9815-8A need careful inspection before use:
- Magnet Recharging: Alnico magnets can lose strength over time. If sensitivity is low, consider having the magnet recharged by a specialist.
- Diaphragm Inspection: Check the phenolic diaphragm for warping, cracking, or delamination. Replacement diaphragms are occasionally available through niche audio restoration suppliers.
- Terminal Care: Clean screw terminals thoroughly to prevent signal loss or corrosion. Use contact cleaner and inspect for signs of overheating.
- Damping Materials: Felt or foam damping inside the phase plug may have degraded. While not always replaceable, ensure no debris is obstructing the throat.
- Testing: Always test the driver with low-level signals first. Use a current-limited amplifier or test setup to avoid damaging the voice coil.
Restored units perform best in their intended setup, paired with original Altec horns and driven by high-quality midrange and bass sections.
Collectibility and Market Value
The Altec 9815-8A holds a collectibility rating of 7 out of 10 among vintage audio enthusiasts. Its appeal comes from its historical use, build quality, and distinctive sonic character. Units in working condition with strong magnet performance command higher prices.
- Market Value: $100–$300 per driver, depending on condition, testing results, and completeness (original hardware, markings).
- Rarity: Moderately available on secondary markets such as eBay, audio forums, and vintage speaker salvage operations.
- Restoration Potential: High—many parts can be refurbished or replaced by experienced technicians.
The 9815-8A is still a desirable and functional piece for collectors of vintage cinema sound equipment or Altec systems.
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