Can anyone recommend a resistor circuit that will attenuate the input of the tube monoblocks approximately 12db?  The amps have about 20db gain.  I've tried a few t-pad configurations that work but seem to affect certain frequencies more that others.  In a word, they have sounded horrible.The attenuation is needed to get a digital equalizer working at peak performance between a preamp and the monoblocks.
Many thanks.