The back of the AT-40 features high-frequency and mid-frequency attenuation switches or pots to adjust level outputs. Over time, dust, moisture, and oxidation build up inside these controls.
Due to their age, the most common issues with the AT-40 revolve around component aging. Because they are often driven hard, they are susceptible to specific, fixable damage. 1. Woofer Foam Rot or Cloth Surround Damage
You're looking for information on the Cerwin-Vega AT-40 specs, possibly to troubleshoot or fix an issue. Here's what I found: cerwin vega at40 specs fix
Don't throw away your AT-40s because of a little foam rot. The fix costs about $50 in materials and one afternoon of your time. Once done, you will remember why Cerwin Vega earned the motto: “Loud is beautiful... if it’s clean.”
Disconnect the speaker from the amplifier. Unscrew the rear terminal plate or crossover plate to access the internal bodies of the adjustment dials. The back of the AT-40 features high-frequency and
Understanding the factory ratings helps you choose the right replacement parts and matching amplifiers. 38 Hz – 20 kHz Power Handling: 5 Watts minimum to 150 Watts maximum RMS Sensitivity: 95 dB (1 Watt @ 1 Meter) Nominal Impedance: 6 Ohms Crossover Frequency: 3 kHz Low-Frequency Driver: 10-inch cast aluminum frame woofer
Before diving into repairs, it is essential to understand the technical DNA of the AT-40. Cerwin-Vega engineered these speakers for high output, wide dynamic range, and deep low-frequency extension. Technical Data 30 Hz – 28 kHz Power Handling: 5W Minimum / 150W Watts RMS Maximum Sensitivity (1W/1m): 97 dB Nominal Impedance: 6 Ohms Crossover Frequencies: 400 Hz / 3,000 Hz Driver Configuration Because they are often driven hard, they are
The most common "fix" required for any AT-series speaker is re-foaming the 10-inch woofers. The original red foam eventually turns to dust, causing the voice coil to rub or bottom out.
Immediately turn the control knob back and forth rapidly through its entire range of motion 30 to 40 times. This friction scrapes away the loosened oxidation.
Do not replace the original woofers with cheap aftermarket drivers. The original cast-frame Cerwin-Vega woofers are highly specialized. Re-foaming them preserves their original parameters and value.