New Large Advent - Reverse Engineering - Some Measurements
I finally got around to measuring a pair of New Advents and the woofer inductor is .3 mH (measured about .298 mH @ 1 kHz), .36 ohm. This makes sense because it looks much like the original Large Advent Woofer inductor without the iron. It is air core. Interesting that the flush mount orange donut tweeter, while looking like the original orange tweeter is very different. Rvc = 2.3 ohm, much lower, and Fc = about 2 kHz, Qtc = about .5. Compared to the orignal with an Fc of about 700 Hz, and mu
The DC resistance is quite low being around 2.1 to 2.3 ohms in most samples of the New Large Advent tweeters. I have been meaning to measure the system input impedance for some time now as I expect it to dip very low in the tweeter range. The original Large Advent tweeters have a DC resistance of about 3.9 to 4.2 ohms which further supports the theory that the New is too low. New Large Advent Serial #U396308: System Input Impedance grill on (recovered with new material) : Switch DECREASE 29