diy speaker to line level converter

[zobsky]

I'd like to tap into the speaker level signal to my arrray speakers to derive a line level output which i can feed to a an amplifier to work a mid bass system supporting the line arrays below 200 - 300 Hz. I think this is called a "line - out converter" in the car audio world. I'd like to know how to build such a device. Most plate amps have these built in, but many plate amplifiers aren't designed to sound good upto 300Hz, hence my interest in building such a device. I don't need channel summing, since I'll be building two seperate mid-bass enclosres.


Thanks in advance

 

[F1 FAN]

You could connect the speaker level into a pair 680k resistors(one for left ch one for right ch)then connect one resistor to the input of each half of a dual opamp configured as a unity gain buffer.This will drop the signal to a useable level.