revisiting the DSE A2667 tweak with better measurements

I just revisited my tweaks to the DSE A2667 speaker (an OK quality cheap speaker commonly available second hand in Australia for about $20). This is because I had the loan of a WooferTester 3 unit from Col, so I could measure the drivers properly, and also had been given an extra pair to experiment with (thanks Gavin!).

TLDR summaryI made one additional adjustment to the crossover that made the response even flatter, by adding a 4.4uF capacitor to the LF portion to make it a 2nd order filter, while inverting the polarity of the tweeter.. but at the cost of an increase in measured distortion at about 3.5khz.
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