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The basic idea

the concept is that you use 4x the capacitance, and use 2x in series with 2x to get back to 1x. The trick is that in the middle of this, you hook up a battery through a high valued resistor (1-2MegaOhms) tied to either end of either 2x cap.

So, you have a DC bias, which will not drain quickly because it's only drawing trickle current through the high resistance. The resistors are there because it maintains battery life, though they're not strictly necessary if you wanted to make a high quality low-ripple DC supply.

Once the batteries charge up the capacitors to 9V (or more if you use batteries in series), there are 2 significant advantages expected. First, the role of the dielectric (the film in my case, but this trick is also done with electrolytic caps) is reduced. This is because of dielectric absorbtion- stored energy in the dielectric is typically released around the 0V crossing, or when the voltage across a capacitor transitions from positive to negative, or vice versa. By biasing the dielectric away from the 0V point, it would take an 18V peak-peak signal (read: LOUD!) to have the signal hit the zero crossing.

The second desired effect is the voltage acting to compress or expand the plates in the capacitor. It's like pre-tensioning something mechanically, they're said to be less prone to resonance issues when charge-coupled.

There's a third effect in that it generally means a lot more capacitor involved, which can mean less energy through a given cap, and more area for heat dissipation (though if you have that issue in caps, you're doing something wrong). This also can be related to parasitics- the number of the caps and how they're arranged can influence their ESR and ESL.

The net effect? Up to you to decide, but it certainly seems to make a more transparent crossover to my ears.






Bass is supposed to sound big. 6.5" is not a woofer size.

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