Altec Lansing 9815-8A 1-Inch Compression Driver

Name: Altec lansing-9815-8a
Brand: Altec

The Altec Lansing 9815-8A is a high-efficiency compression driver produced during the 1970s as part of Altec's professional audio lineup. Designed for use with constant-directivity horns such as the 811B, this driver was widely deployed in cinema sound systems, public address (PA) installations, and studio monitoring environments. Known for its robust construction and dynamic clarity, the 9815-8A exemplifies the mature evolution of Western Electric-derived driver technology that Altec refined over decades.

With its alnico magnet structure and 1-inch phenolic diaphragm, the 9815-8A delivers a bright, articulate sound signature that became a hallmark of vintage professional audio systems. While often praised for its presence and projection, proper integration with compatible horns and crossover networks is essential to avoid a harsh or overly forward tonal balance.

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 emerged during a period when Altec was a dominant force in professional audio. Building on legacy designs from Western Electric, Altec engineered drivers that prioritized reliability, high output, and sonic clarity—critical attributes for movie theaters and live sound reinforcement of the era.

This driver was commonly paired with the Altec 811B elliptical mouth horn to form a high-frequency section in multi-way cinema speaker systems. Its high sensitivity allowed it to be driven effectively by tube amplifiers, which were still in widespread use during the early 1970s. The 9815-8A also found use in studio monitor designs and touring PA systems, where its durability and projection made it a favorite among sound engineers.

As solid-state electronics and newer neodymium-based drivers emerged in the 1980s, Altec's alnico-based models like the 9815-8A gradually faded from mainstream use. However, they remain prized by vintage audio enthusiasts, restorers, and audiophiles seeking the "classic" Altec sound.

Sound Signature

The 9815-8A is known for its crisp, detailed high-mid and high-frequency response. It exhibits a characteristic "Altec presence"—a slight emphasis in the upper midrange that enhances vocal intelligibility and instrument definition. When properly integrated with a matched horn and crossover, it delivers a lively and dynamic sound.

However, due to its forward nature, improper horn loading or crossover alignment can result in a harsh or fatiguing listening experience. Pairing with well-maintained Altec horns and vintage-style passive networks yields the most balanced performance.

Maintenance and Restoration Tips

Given their age, surviving units of the 9815-8A require 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 when used in their intended context—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 lies in 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.

For collectors of vintage cinema sound equipment or Altec systems, the 9815-8A remains a desirable and functional component of a bygone era in professional audio engineering.