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Original Message
more possibilities
Posted by DrChaos on April 5, 2021 at 09:06:14:
looser & different tensioning. That's what I think it is. My hypothesis: there was a loss in bass performance from the wire bass panels (which can be doubled and are heavier, aka lower resonance freq) to the first QR woofer generation, which was alleviated with the 'i'. The 0.7 and 20.7 already have the change from the get go.