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Re: Scan-Speak Revelator 9900/9500, 18w/8545, 18w/8546 and a Transmission line MTM...

24.30.133.147

The combination D2905/9300 and 18W/8546 is what Northcreek uses in their Borealis system. The only difference I can see between the 9300 and 9500 tweeters is the resonant frequency. It's 100Hz lower with the 9500. All other parameters are the same. Crossover is about 1800 Hz using a third order (electrical) crossover. Components in the woofer leg are: 1.9mH inductor followed by a 20.4uF capacitor/2 ohm resistor in series shunted to ground, followed by a series .60mH inductor. The tweeter leg is a 11.0uF cap followed by a .44mH inductor to ground with an "L" pad consisting of a 3.32 ohm series resistor and a 6.81 ohm resistor to ground. If you're going to use an MTM arrangement, then a modification to the woofer leg components should get you close.

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