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RE: "extending the lower bass of the panels" ...

The caption says the bass was measured separately below 300 hz in "quasi anechoic" conditions which is long form for near field.

The speaker level XO should reduce the damping available from the amp. At least vs. not having it in the way.

The transient dynamics are a matter of power supply and the IV curves of the output devices. Pass points out somewhere in his white papers that besides power supply sag the output devices are just not linear outside the narrow range at their center where the IV curve is straight. so he chooses where to operate the output devices to get the least compression and then to make that compression come off as naturally as the drop off of SPL in air. That way he is thinking that the effect would be similar to sitting a bit further away from the sound source rather than being perceived as drooping output.
Pass also discusses the effects of transformer saturation. The effect is compression of dynamics and he gauged its audible effect by using two giant spools of magnet wire on pallets .stacked on top of each other as an air core transformer for the same amp design. There he noted how it differed in there being a lack of compression, among other things. He then lamented the impracticality of air core transformers since they would be as big as speakers beyond a few watts and be entirely immobile..

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