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Old 11-03-2011, 01:06 AM   #21
sqcomp
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Flat response means what?

"An output signal in which fundamental frequencies and harmonics are in the same proportion as those of the input signal being amplified. A flat frequency response would exhibit relatively equal response to all fixed-point frequencies within a given spectrum."

How do you measure the frequencies and harmonics at the speaker output level? With an RTA meter. More specifically an Audio Control 3055 as in the picture below. How do you measure if your setup has equal response on all fixed point frequencies? With pink noise. Why pink noise instead of a regular track of music? Because a “regular” music signal doesn’t have equal response at all fixed points across the audio spectrum (20 Hz to 20 kHz).



“Any sort of meter is absolutly worthless when EQing for a flat responce and your ears must be the sole "instrument" used, othewise, WTF is the point?”

Go back to the beginning of the post. Do you notice where we started to part ways? It was when I got into the more technical area of the measurement of speaker response. You notice that I agree with the idea of music that is true to the source?

If you would have stated that any sort of meter is absolutely worthless when equalizing for listening and your ears must be sole instrument used…

This is why I came with the phrases tonal accuracy and spectral balance. Tonal accuracy means:

“Tonal accuracy describes how faithful a system is in general to the original recording. It can apply to instruments as well as vocals. The more accurate the system is while playing a good recording, the more you feel as if you are there, listening to a live performance as opposed to a recording.

Tonal accuracy can also apply to the ambiance in a recording, which refers to the space in which a recording is made. Most modern recordings are made in a sort of vacuum, with individual instruments recorded separately or, in the case of some rap music, the individual parts are sampled from other recordings. But many older recordings, some modern ones, and almost all live albums capture the environment in which the performance was recorded. In fact, certain recording studios and performance spaces are known and revered for their sound, which give a recording or performance a specific ambiance.

Think of timbre and tonal accuracy as the reproduction of how close you get to the actual performance or how the producer intended for it to sound. Whether it's the sound of Miles Davis's trumpet, Jimmy Page's guitar, a Dr. Dre beat, or the ambiance of Carnegie Hall, how well a system can reproduce it the way it went down in a studio or concert hall determines the difference between a good system and a great one.”

Spectral Balance means:

“Spectral balance is a test of the system’s overall tonal realism at the listening level, encompassing the tonal accuracy of the system across the entire frequency spectrum. Superior systems will sound effortless and natural. Weaker systems will exhibit distortion, unnatural discoloration, dynamic compression, and frequency response errors, which lead to listening fatigue and lend an unnatural sound to the music.”

If this is what you mean by flat response we are absolutely on the same page and agreement.

I read flat response as something that is measurable...hence the picture of the meter picture of a flat response measured on output with an RTA. My hearing of an absolute and measured flat response is a horrible listening experience. I've stated this once before.

Now, if by flat response you mean exactly the same experience as you'd hear at a concert for example, I offered the alternate phrase of tonal accuracy and spectral balance. With that translation, your ears are the only thing you're playing for anyway.

what are you thinking about this?
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