For amplifier, as it has been used in this thread, no - you haven’t fixed it and I suggest you read back to the statement I was describing.
if I owned one of the integrated amps listed here that have tone controls or equalisation and used those functions wouldn’t I be expecting an uneven frequency response as a result?
I always wondered one thing, how about amps that are designed to give a specific characteristic of sound. Emphasize certain frequency on purpose? using Krell as an example. Their amps are known to be rather neutral and cold. Not everyone likes it. However, they have changed more recently to appeal to more pple. Wouldnt this be a design characteristic instead?