I have used the attenuators they make with good results.You can also use two for a 24db slope! Parts express sells them and they give full refund if they don't work out!
Harrison Laboratories
I'm considering using the line-level high pass crossovers available from Harrison Laboratories. They will take some of the load off my main amplifiers and letting a dedicated subwoofer take more of the burden, say below 70 Hz. I'm pretty sure they are 12dB/octave devices. Does anyone have experience with these little gadgets?
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