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General Asylum General audio topics that don't fit into specific categories. |
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General Asylum General audio topics that don't fit into specific categories. |
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In Reply to: Just for arguement's sake Mr Inmate51 :) posted by 3db on June 19, 2015 at 05:21:49:
In most rooms, the frequency response you hear at the listening position is dominated by the overall power response radiated by the speaker into the room and how it interacts with the room. The overall power response is never flat.
Suppose you design a speaker that is perfectly flat when measured at 1m distance on the tweeter axis in an anechoic chamber, which is a design target for some companies. Unless the speaker has perfect constant directivity (none does), the response off the tweeter axis will not be flat. The dispersion characteristics of most speakers lead to an off-axis response that slopes downward with frequency, with the slope increasing as you move further off axis. Hopefully it's a smooth curve without any major peaks or suckouts, but few speakers achieve that. And the peaks and suckouts vary depending on whether you are moving off axis horizontally or vertically.
Also, as you move out from 1m distance, the on-axis response will change too. It will become generally down sloping, with some peaks and dips. This change with distance occurs even under anechoic conditions.
Good speaker designers pay as much attention to the off-axis response as the on-axis response, making trade-offs between flatness of the on-axis response against the shape of the total power response. If you chase perfectly flat on-axis pseudo-anechoic response and take what you get off-axis and at distance, the result ends up sounding colored in-room.
Now suppose you were to design a speaker that is both flat on-axis and you try to control off-axis response by limiting directivity as much as practical. The result will have a flatter power response, but will also sound unnaturally bright. Because music isn't being produced with that kind of target response in mind.
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Follow Ups
- There's really no such thing as a flat speaker - Dave_K 08:13:20 06/19/15 (3)
- RE: There's really no such thing as a flat speaker - 3db 08:49:50 06/19/15 (1)
- They ALL purposely roll off the top end - Dave_K 13:13:11 06/19/15 (0)
- RE: There's really no such thing as a flat speaker - Inmate51 08:38:45 06/19/15 (0)
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