If an active crossover is fixed at 120hz into 4 ohms does the effect on frequency filter change in accordance with load as with a passive crossover? i.e with an 8 ohm load would the filter point be closer to 100hz?
No. The active crossover is before the amp so the load on the amp has no effect on the frequency.
Think of the op amps etc. used in the active filter as a built-in buffer.
One op amp will be at the output, having a source impedance of a few ohms.
So nothing external to the active filter circuit will affect its response.
Even if the power amplifier itself is configured as an active filter.
That's their biggest advantage: unlike passive crossovers, active crossovers have no direct
interaction with the drivers, and can be designed much more precisely.
One op amp will be at the output, having a source impedance of a few ohms.
So nothing external to the active filter circuit will affect its response.
Even if the power amplifier itself is configured as an active filter.
That's their biggest advantage: unlike passive crossovers, active crossovers have no direct
interaction with the drivers, and can be designed much more precisely.
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