The Dayton Audio B652 speaker was a fantastic budget audio speaker.
The B652 Air took it for a giant leap forward.
My hot-rodded version includes the following modifications:
Stock electrolytic capacitor replaced with an audiophile quality Jantzen cross-cap.
Stock resistor replaced with a Mills audiophile resistor.
Stock fiber replaced with Acousta-Stuff fiber made for speaker enclosures.
Stock sponge feet replaced with 3M brand elastomer isolators.