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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: Re: MMG Crossover Rebuild posted by Dawnrazor on February 1, 2005 at 15:47:57:
Regarding the tweeter section, it works similiar to the highpass section of a series crossover. You pick an inductor that's reactive with a certain load at the crossover frequency you want to use. If the DCR of the coil is very low, you get a short circuit to ground below the cutoff, draining the power away from the tweeter at low frequencies. The extra resistor is in there to prevent the amp from seeing a short too. There's a problem there in the fact that the tweeter's rolloff is not continuous and actually only levels off to about -40 dB or so in simulations I've done with dynamic drivers. The tweeter is pretty vulnerable to being overdriven with just the shunt coil. With a cap, the rolloff doesn't level off, it continues to rolloff as frequency drops so the tweeter is better protected.I can see the sonic advantage of not having the cap is there but the thought of needlessly overdriving the tweeter scares me. I plan to try a simple first order series crossover with just a cap and coil, like the old SMG had so I'll have to deal with avoiding overdriving the tweeter as well.
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Follow Ups
- Re: MMG Crossover Rebuild - Ken Perkins 17:21:43 02/01/05 (1)
- Re: MMG Crossover Rebuild - Dawnrazor 20:44:35 02/01/05 (0)
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