Many original AT-10 (mistakenly called AT40) units suffer from a in the tweeter circuit: the factory 2.2 µF non-polar capacitor drifts high over time, causing the tweeter to receive low frequencies below 1,800 Hz. This leads to distortion and blown tweeters.
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The most frequent issues with the AT series involve aging components that degrade over several decades. 1. Foam Surround Rot (Re-foaming) The Problem: Many original AT-10 (mistakenly called AT40) units suffer
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. They prioritize "impact" over audiophile-grade flat frequency response Build Quality