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Message: <blockquote data-quote="Murray" data-source="post: 1184225" data-attributes="member: 3345"><p>You also get analogue active crossovers which are difference based, on a 2 way that would be one filter, the difference opamp. The benefit is that the total output signal always matches the input. Full phase compensation. With seperate filters, like a linkwitz-riley you need to make sure your 2 filters are on point, a slight offset in one because of, say capacitance tolerance, or drift, would leave a dip or a bump in your total system response curve. The one drawback with difference circuits is that you can't easily get more than 6db/octave. I built an active crossover difference circuit that I use with my SEAS drivers. Works a charm. And you can, by simply twisting a pot, move your crossover frequency, without worrying about total system performance, it's flat. As with all active crossovers, you get good driver control because you get the most out of your damping factor. And for those who say damping factor is a non issue in the age of silicon, I'd like to point out the additional series impedance of the crossover, especially at the xo frequency. Suddenly your damping factor is lost, and drivers are left to wabble about at their leisure.</p></blockquote><p></p>