richie00boy said:Look on the ESP site, but take note of the warning in the article regarding how they destroy phase consistency across the band.
I just use an inverting op-amp and a switch to choose normal or inverted, no phase abberations that way.
Found it http://sound.westhost.com/project103.htm
yeah maybe a waste of time, I measured with a db meter at the xover frequency 160hz and got a difference of -6db when reversed, naturaly I went with the louder one and it sounds much better. Is a difference of 6db usually the case if things are 180 degrees out? Meter measured 78db then 72db in a quite room (40db) at the xover of 160hz 3 meters from the speaker.
Thanks George
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