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I'm using a Raven R2 in an MTM system with a pair of drivers that are close to the ribbon in efficiency. I made this choice in part because I've read that it's not a great idea to try to use drivers of significantly different efficiencies. The issue evidently relates to the undesirability of bringing the tweeter down to the efficiency of the other drivers by the use of extra resistance [talking passive Xover here].If I'm right here what exactly is it that the extra resistance does to the response of the tweeter?
Would a non-passive crossover of some sort counter this problem?
Follow Ups:
Even if the efficicencies are relatively the same, sometimes a small bump in the resistance on the tweeter helps. I have a set that I built whose efficiences are the same on paper but I have 1.5Ohms of resistance in front of the tweeter.If you raise the resistance on the tweeter it changes the crossover's effective frequency to the tweeter. You need to account for attenuation and the tweeter's impedence at the crossover frequencey when you design your crossover.
More simply, if you add a resistor to a single 1st order crossover for the tweeter, you'll have to go to a smaller value capacitor to have the same effective crossover frequency as before.
The non-inductive metal oxide resistors have a better sound in my opinion too.
try a r100t fostex spet down transformer works great with r2.You know fostex fe208e sigmas a good match for r2 and you will need just a cap.
No L-pad is great but good quality resistor is just as good.
I hear no difference at all.
thanks all ... I'll keep the info. in mind.I actually have a pretty close match between the efficiency of my drivers [93db/metre] and my R2 [95db/metre from memory] but I was wondering if there's a problem when there's a wide disparity, such as using say 85db/metre drivers.
Is the only drawback an effective loss of the efficiency of the R2[through the need to add resistance]?
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