Agree with David and Claudio, but would add the listener to the 'system'.

I have just started using my first hearing aid for age-related high-tone 
deafness; it acts as an equaliser, but not a very good one.  As my 
deafness has progressed over decades, I have regretted the current 
fashion for not providing graphic equalisers in pre-amps.

Frank.

On 04/12/17 10:16, David Hitchin wrote:
> There was an objection to CDV's recommendation for graphic equalisers, 
> on the grounds that a good system should be perfectly flat.
> 
> That theory should be right providing that the listener is using 
> headphones, or, if using loudspeakers is in an anechoic room (which I 
> have heard is psychologically unsettling). Otherwise the most non-linear 
> part of the system is the listening room - yes, that is part of the system!
> 


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