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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Question for Jon Risch posted by PE Paul on May 6, 2000 at 07:07:32:
It helps to keep in mind that series networks are actually using the driver as a path to get signal to the other driver. If you flatten the impedance of the driver with a Zoble or conjugate, all you have done is make that portion of the path more resistive and linear. If you add a series notch filter, the impedance will go very high, and make that path less linear and less resistive, adversely affecting the operation of the series network.For both series crossover networks and the more conventional parallel networks, use of an overdamped Zobel network is a way to help tame a peak or series of peaks, that won't muck with the crossover circuit too much, and the tuning is a lot less critical.
An overdamped Zobel is when the cap gets bigger than nominal, and the R goes up over the calculated value for a true Zobel. They both go up by a factor of about 1.4 to 1.25. My personal prefference is to increase the cap value by 1.25 and the R value by 1.4. This seems to give a good combination of impedances, and keeps the Cap cost down.
For metal drivers and or multiple peaks, use of the 1.4 multiplier for the cap is recommended, and the R by 1.25 -1.3
Jon Risch
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Follow Ups
- Re: Series networks & Notch Filters - Jon Risch 08:56:17 05/07/00 (1)
- Re: Series networks & Notch Filters - PE Paul 16:59:03 05/07/00 (0)
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