Below is the official specification sheet for the Cerwin Vega AT-40. Note that these figures are from original Cerwin Vega literature. Variations may exist in different production runs (e.g., early vs. late 1990s models).
If you test a pair and notice a tweeter is cutting out during heavy play, the PTC device is doing its job. If a tweeter stays silent permanently, it may need to be unbolted to verify that the crossover wires are still attached or replaced entirely.
This is the most common issue. The original red foam surrounds on the 10-inch woofers degrade and crumble over 20–30 years. If the foam is rotted, do not play the speakers, as it can misalign the voice coil. Fortunately, "re-foaming" kits are inexpensive ($20–$30) and widely available online, making this a rewarding DIY restoration project.
The midrange driver handles vocals and instruments, while the soft dome tweeter provides crisp, clear high frequencies that do not become fatiguing, even at high volumes. The high sensitivity of these drivers means the speaker doesn't need huge power to reach "concert" levels. 3. Crossover & Protection
Before diving into the AT-40 specs, let's briefly discuss the Cerwin Vega brand. Founded in 1954 by David Cerwin and Paul Vega, the company has a rich history of producing high-quality loudspeakers that cater to various applications, including music, film, and live events. Over the years, Cerwin Vega has established itself as a reputable manufacturer of innovative and reliable audio solutions.
Here is the detailed breakdown of the manufacturer's specifications. Note: Cerwin Vega published minor variations over the production run (approx. 1988–1993). The specs below represent the most common, canonical data set.
The AT-40's versatility makes it suitable for various applications, including:
Crossover points are fixed at 400 Hz and 3,000 Hz. The dedicated midrange driver handles vocal clarity and instrument presence before passing the signal to the upper registers.