Do not throw away or replace the original woofers with aftermarket brands. Replacing the original cast-frame driver ruins the speaker's unique parameters and resale value. Instead, purchase a 10-inch Cerwin-Vega re-foam kit (specifically looking for the iconic red/orange color).
After the fix, measure impedance: you should see a twin-peak between 38 Hz and 65 Hz, and a single smooth rise after 2.5 kHz.
These repairs are more advanced and require soldering skills.
1-inch microcell polymer dome tweeter
The Cerwin-Vega AT40 is a 3-way, bi-amped loudspeaker system designed to deliver accurate and detailed sound reproduction. With its powerful woofers and titanium dome tweeter, the AT40 is capable of producing a wide range of frequencies, from deep bass to crystal-clear highs.
If cleaning the switches does not restore the treble, test the tweeter.
Remove the tweeter from the cabinet and disconnect the wires. Use a digital multimeter set to Ohms ( Ωcap omega ) across the positive and negative terminals.
Replace the old capacitors with modern film capacitors (like Dayton Audio or Solen) of the same uF value. This often results in improved clarity and a "faster" transient response in the high frequencies. 4. Cabinet Air Leaks