Is this active x-over design worth while?

[JensRasmussen]

klitgt,

I think you will be better off using one of the many designs based on “real” opamps. But if you want a nice discrete opamp try looking here: MOX - active crossover

You should be able to use this opamp with just about any active filter topology you can find.

Good luck

\Jens

[tschrama]

Why is everbody talking about opamp, while this guy designed a, what looks like a good, discrete buffer?

the circuit attached in the first post should just work fine, or am I missing simething?

[darkfenriz]

Thanks Charles
I wrote nonsense.

[klitgt]

Originally posted by Ricky
As a professional designer of loudspeakers, I would say that at least 18dB/ Octave is preferrable. The problem that you can have with 12dB is the steepness of the slope ( or lack of it). Let's take, for example, a ribbon tweeter. These perform very well in the case of the Visaton MHT12, from around 2500 to 3KHz but, to function correctly, they need quite a steep filter slope say at least 18dB/ Octave. The 24dB Linkweitz Riley crossover is good because it gives you a nice steep slope BUT, you get the equivalent of 1st order phase response.

If it were me, I'd go for the above option.

Best of luck.

Ricky.

What I want to use the filter for is a bi-amp system for "bookshelf" size speakers assisted by subwoofers with a cross-over frquency of 100 Hz. The small speakers are able to go down to 60Hz, therefore I do not believe it is necessary with steper slopes than 12dB/octave.