The arithmetic difference between the cut-off frequencies or – 3 dB points in a response curve, expressed in octaves or as a frequency difference in Hertz.
"I've always received quality LP to CD conversions. This new sound restoration process continues and builds upon the original (excellent) process. The sound is crystal clear. I can't detect any hisses, pops or any other background noises. I will definitely be sending some more of my old recordings to be converted to CDs using sound ..."