Maybe, to me the question is whether the rolloff is starting at low enough frequency to be audible. Anyway here is the EQ filter. A lot of calculations and in the end it is essentially just a gentle rolloff!According to benchmark article at
0.2db is at the threshold of audibility. 0.5db gives "red" color in the example Excel worksheet.
So, "just 1db" supposed to be so obvious that no abx is needed, at least for those who can still hear 20khz.... : P