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The original AMT-1 evidently used a 10" woofer. The 1a had a 12" woofer with different parameters. The original 10 must have been what I remember. Stereo Review wrote up the 1a and said the new speaker was more balanced, and the lows improved to match the AMT mid/tweeter.Noted. I was just sharing my own data point (experience) about the Heil AMT tweeter...