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In Reply to: RE: Ideal frequency response curve posted by throwback on June 16, 2015 at 06:03:35
The B&K curve can be found here:
http://www.bksv.com/doc/17-197.pdf
Harman did a study and came up with a similar, but more tilted curve:
The Subjective and Objective Evaluation of Room Correction Products
There is no right answer. As Toole laments in his book Sound Reproduction, there is no standard governing the frequency response of systems used in music production. The film industry has its X-curve but the music industry doesn't have an equivalent.
The B&K curve is a pretty good place to start however.
Follow Ups:
I've been demoing an Anthem MRX 710 receiver. It estimates a "room gain" which effectively boosts the target in the bass for in-room response.
There was an interview by the designer who said that it's your ear & brain that automatically "normalizes-out" (my interpretation) the effect of the room. (like the way your brain normalizes color balance that photographs don't).
So if you equalize something to sound flat anechoically or outside, then it will be tilted towards bass indoors, and this is how it should be.
If it's equalized to be flat indoors, it will sound lousy.
Yes, flat anechoic response is also a good place to start. However, it isn't necessarily correct either. The room contribution depends on the radiation pattern of the speaker, so you can equalize two different speakers to be flat on-axis under anechoic conditions but they will have different in-room power response at the listening position. Speakers with greater directivity will sound brighter. When experimenting with various flavors of DSP equalization, I've always found there's a tradeoff between optimizing pseudo-anechoic response vs. optimizing overall power response.
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