Passive line filter (Oris Horns)

by Bert @, Sunday, December 09, 2007, 21:58 (5955 days ago) @ diy martin

Hi Martin,

The pre-amp has an extra gain of 10 for the bass amps, gain is no problem.

If this means that your pre-amp has two seperated outputs then you can connect it in front of the buffer.

Both output impedances (pre and buffer) have the same problem (being too high compared to the input impedance of the amps...) to be able to succesfully use the line level filter. Increasing the resistor/capacitor values as suggested before will make something completely different out of the filter as the output impedance should be much less compared to the first resistor of the filter and the input impedance should be much higher compared to last resistor of the filter).

You could use the buffer to create an active filter around that though (if it is an IC).

Check out the Linkwitz pages for formula's and schematics...

Or exchange the buffer for a small amplifier (IC?) with very low output impedance (0-10 ohms) to "imitate" a real amplifier so that you can use the passive line filter as intended.

Bert

--
BD-Design - Only the Best!

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