post #16 of 16
Originally Posted by firev1 View Post

EQ to a large extent does cause distortion, loss in transparency unless you have a completely transparent hardware or software implementation. Its not just a matter of changing volume levels, its not as simple as you think it is. That is why most digital volume control implementations can be disastrous. 10% is still a good guideline for headphones.

I'm sorry but that's wrong. I have implemented EQs myself (a free one is available as 31 band graphic EQ plugin for fb2k). EQs usually work with 64-bit floating point numbers and after all the processing is done you quantize back to 24-bit integers for example. And if you understand the math behind it, it is quite simple. To prove that there is no distortion, loss in transparency or anything else you might fear simply take a min-phase parametric EQ, process some 24-bit recording with some peaking EQs, then process the output again with the same EQs but negate the gain (and adjust Q if necessary) and compare the output with the original file. They should null.