Capacitor across sub terminals to reduce reactance

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
SOrt of, adding a resistor there two will create a zobel network, this will flatten out the impedance curve that naturally rises due to the self inductance of the voice coil.

In a subwoofer I dont think this is worth doing the sub driver is directly driven by the amplifier yes?

The driver will also probably have a lowpass on it around 80hz or even less. The rise from self inductance will most probably be way past this frequency, so the amp will not even be driving the sub at frequencies where the impedance rises.

Do you mean something else?
 

soongsc

Member
2005-03-26 2:31 pm
Taiwan
If your sub has a crossover built in, most probably it would have an RC zobel built in. The thing that mighrt effect the amp is the natural resonance point where the impedance peaks. This would require an RCL zobel. It is best to test the impedance curve and design the zobel if necessary. If the peak is real high, like over twice the nominal impedance, then you might consider the zobel. Otherwise it might not be necessary.
 

soongsc

Member
2005-03-26 2:31 pm
Taiwan
The power saw power conservation is a different issue. In the power saw application, you are changing the phase of the current so that the power factor is better. It is possible because you are tuning only to one frequency. If a power saw has different speeds, I would think you'd have to switch caps for each speed.
 
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.