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previous: Nic Neufeld I just thought it would be easier a... -- 1/31/2003 5:45 PM View Thread

Re: Passive Crossover for guitar/bass?

1/31/2003 7:54 PM
anonymousRe: Passive Crossover for guitar/bass?
Unless you can find some specific solution, I think you could approach this problem in a similar way to bi-amping or tri-amping a stereo system.  
Most of these crossovers are fixed. You want variable frequency crossover points.  
 
This should give you an idea of concept of the fixed point type:  
http://kahuna.sdsu.edu/~tucker/diyaudio/xover.html  
 
There are pros and cons to any filter type, but to have control over the crossover frequency, most folks use the Sallen-Key type. Don Lancaster is the Sallen-Key guru. His book has good design info for this kind of task:  
http://www.amazon.com/exec/obidos/tg/detail/-/075062986X/103-0413472-0019841?vi=glance  
 
Good article from ESP:  
http://sound.westhost.com/project09.htm  
 
After you have picked up a few buzz words, you might find something more specific on the net from a Google search.  
 
Most design info I have found is limited to the actual filtering circuit. Most filter designs want to be driven by a low impedance source so be sure to buffer the input with a voltage follower.  
Finally, be sure to control the gain of your crossover(s). You may have a net signal gain out of the crossover so make provision for attenuation at the output. A voltage divider on the front end of a voltage follower is a good way to do this.  
Good luck.