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Originally Posted by Rick721
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Same brand but the premium gold-silver-oil caps are used on the mid driver high pass in the 801D4. Crossover caps are only part of the explanation though, noting that the older 800D2 model uses the same premium Mundorf's in both high and low pass filters - so it's actually more 'premium' than than the latest 801D4.
Of course it's not possible to see the actual values of those caps in the vid, so it's entirely possible that the crossover frequencies differ slightly between models, and there are also resistors off-board to slightly alter the balance between drivers and tailor the filter Q's etc. So even if measurements look similar there may be subtle changes that are easily audible.
What the video does confirm though is the crossover design itself which is essentially identical to the previous D3's, D2's and D1's.