For "flat" (frequency) Response we have a term and definition in Music Technology.

"Flat" (Frequency) Response (Music Technology)

When an amplifier / microphone / loudspeaker displays an even frequency response (an even efficiency of frequencies within its bandwidth). This is usually defined as being within 2 dB's .
Frequency: – The amount of times that a wave repeats per second, measured in Hertz (which are cycles per second) after Heinrich R. Hertz the man who devised this form of measurement. Or to put it another way, if a soundwave vibrates the air x amount of times a second, this could be said to be it's frequency in Hertz. A young human who hasn't abused their ears (unlike most of the visitors to this site!) will be able to detect frequencies roughly in the range of 20 - 20,000 Hertz. However, as we get older and/or abuse our hearing listenting to loud music etc, this may gradually roll off so that an older person / Death-Metal fan may only be able sounds up to the frequency of say, 16,000 Hz. Our ears become progressively less sensitive to sounds below 500 Hertz, and they are at their most sensitive to sounds which have a frequency of @ 3-5kHz.

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