i wanna take a 2 channel L/R stereo source and have it feed 3 amps:
Left, Right and Subwoofer.
Im thinking of crossing over at around 100hz.
which would be easier (minimal components) passive or active?
and how do i take the Left ant Right and summ them up to feed the sub amp?
Left, Right and Subwoofer.
Im thinking of crossing over at around 100hz.
which would be easier (minimal components) passive or active?
and how do i take the Left ant Right and summ them up to feed the sub amp?
Do you have the Sub Amp yet ? If not try & get one with a Xover built in. Also look for one which has L & R inputs which are merged internally. That way problem solved !
Active means any powered circuit, which in this case would be the OpAmp solution. Passive means unpowered, which could be before and/or after the Amp.
EDIT
Of course you would need a high pass filter for the L & R too, which matches the 100Hz etc low pass !
Active means any powered circuit, which in this case would be the OpAmp solution. Passive means unpowered, which could be before and/or after the Amp.
EDIT
Of course you would need a high pass filter for the L & R too, which matches the 100Hz etc low pass !
Last edited:
Passive is fewest components and normally sounds best. However a passive XO at 100Hz is going to call for some fairly huge inductors (in the range of 10H) to operate at line level. Probably you'll have to wind them yourself (on gapped ferrite cores) which will take a couple of hours for each.
You could employ the design resource here - Passive Crossover Design Equations Formulas Calculator - Two Way Second Order Network Chebychev Bessel Butterworth Linkwitz-Riley
You could employ the design resource here - Passive Crossover Design Equations Formulas Calculator - Two Way Second Order Network Chebychev Bessel Butterworth Linkwitz-Riley
A two pole LC filter has both real and imaginary components for its two poles, thus giving an extra degree of freedom - damping (or its inverse, Q). The damping is provided by the losses (ESRs of caps and inductors) plus any explicit resistance in the circuit (for example - the load). Chebyshev filters have the lowest damping (or highest Q), then Butterworth; Bessel has the highest (lowest Q).
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