Audax HM100C0 4" Carbon Fiber Cone Woofer

HM100C0, 'This, the AAC version of the original Audax, is a unique driver, specializing in great clarity but having unique faults. These include a sealed-box roll off of 130-180Hz (but otherwise good bass) and an ear-splitting breakup mode. This HAS to be dealt with, and the trickiest solution comes straight from J. Krutke and his peak-smashing method for his own aluminum driver. Cap: 0.33mic. Inductor: 1mH. This works. What does not work is the 1Mh, And I have chosen around .35 mH and .90 mfd, this keeping the inductor/ cap product the same, but lowering the trap frequency a little bit. Sounds really fantastic. Mates with tweeter at about 4500(!!) This is a range for planar & ribbon tweeters, but for me, any ribbons have NOT worked, period. My Fostex ftpr7 is very much at home, as would be the Hi vi -1c. The performance with massed chorus is otherworldly! Cheap and very high SAF using box sizes down to 1.7 liters. Also efficient- works on flea-power amps, and this is most uncommon W/ four-inch drivers.' Review by Doug Packard. Posted by Madisound.
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HM100C0, 'I have used a modified version of the ancestor of this driver, the MHD10P25FSM in the now defunct Microphase SAT from 1984 onwards. I have used the current version as a replacement and found it quite good, although the lack of a phase plug, as used in our version, does make a difference in the transient response. I suppose it has something to do with the break-up mode discussed in the other review. If you want to know more about our design, you can visit our site: www.frenchvintagehifi.com, where we talk about iconic French speakers and other HiFi products from the 70s and 80s. Good reading!' Review by Jean-Marie LIERE. Posted by Madisound.