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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: Resistively Damped Operation? posted by Wheel on January 16, 2000 at 11:52:45:
Unless specifically stated otherwise, the T-S parameters of a dual-VC driver are usually given for the two coils in parallel.Once you 'throw away' one of these active drive elements, the parameters often go to heck in a hand cart pretty badly, and shorting one of the coils to get back some of the damping would only result in the loss of several dB of output at ALL frequencies, as well as overdamping the driver resonance region causing even more losses there.
Not a good idea, espeically for an expensive driver.
The only decent application I have ever seen of this principle, is to use a regular cheap woofer as a passive radiator, add enough cone mass to get the passive radiator tuning needed, and then use the VC to control the passive radiator Q by shorting through a rheostat to vary the damping. Then it becomes a "not-quite-passive-radiator". At least this makes sense from an economic viewepoint, taking what might be an other wise unused woofer and making use of it's magnet and structure to replace a vent. The usual rule of thumb is to make the passive radiator one size bigger than the active driven cone, eg., use a 10" passive for an 8" woofer.
Jon Risch
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Follow Ups
- Re: Resistively Damped Operation? - Jon Risch 07:34:38 01/20/00 (0)
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