All, I am reluctant to start a new thread but I have not found a discussion in this forum specifically dealing with my issue.
I'm connecting the subwoofer-out from a Cambridge Audio receiver (540R v2) to an external subwoofer amp (Reckhorn A-401). Like all A/V receivers, one can set the crossover frequency on the 540R. What is unknown is this: at what slope are the frequencies sent to the sub amp. I cannot find any published specs on this in the 540R literature, and I don't want to guess.
So, how have you resolved this problem if you also don't have the needed data for your receiver?
I have posed the question to Cambridge Audio via their support site, but it may take them a long time to respond. Thought I would ask people here.
Any thoughts welcome!
Normally from an electrtronics standpoint most crossovers are passive and act as a Butterworth variation of a low-pass filter. While the intent is a step function with no slope, some slope will always exist.
To design a lowpass Butterworth filter, first determine the order (N) of the filter. Factors that affect filter order include:
Cutoff Frequency — Fc— the point at which 3dB attenuation is achieved
Passband Ripple — R(dB)— The maximum allowable ripple within the passband
The frequency — Fr — at which the specified passband ripple occurs.
Out of band attenuation — A (dB)
The frequency — FX — at which the out of band attenuation must be met.
Good luck in getting detailed design specifications on the Cambridge Audio 540R v2 unless they put you directly in contact with the actual design engineers.
