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MKT capacitors are metallized polyesther flim capacitors.
They range both in price and in quality between the low-loss M-CAP
and the inexpensive bipolar electrolytic capacitors. The loss factor
of an MKT capacitor is about 20 times that of an M-CAP, but less
than a tenth of the loss factor of a bipolar electrolytic capacitor.
(Loss factor M-CAP: 0.0002, MKT: <0.006, bipol. el. cap., smooth:
<0.05, bipol. el. cap., rough: <0.08). MKT capacitors could be said
to represent the "upper middle class" among capacitors. They are
used both as parallel capacitors in high end applications and also
in the signal path of good but cost-consciously designed frequency
crossovers.
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