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October 30, 2009 4 min read
I went back to my office and played my Ayre Acoustics pink noise track: turned on the FFT; I was immediately greeted with a familiar noisy green line frequency response spectral display that was settling nicely as it continuously averaged over last two seconds.
An FFT analyzer performs a fast fourier transform calculation which very rapidly takes in samples of a continuously varying analog signal and spits out spectral information. In other words, play pink noise (which is a signal with equal amounts of energy in all frequency ranges), and an FFT analyzer will very rapidly show a frequency response curve. In the case of pink noise, the response should be a flat line.
[caption id="attachment_589" align="alignright" width="300" caption="Harbeth HLP3ES-2 Speaker Frequency Response"]![]() |
[caption id="attachment_590" align="alignleft" width="300" caption="Ruh roh! Something's wrong with this speaker!"]![]() |
[caption id="attachment_592" align="alignright" width="300" caption="The Boaston Acoustics Duo-i plus sounds pretty darn good."]![]() |
[caption id="attachment_594" align="alignleft" width="300" caption="BA Duo-i plus with all controls set at neutral."]![]() |
[caption id="attachment_595" align="alignright" width="300" caption="BA Duo-i plus with bass and treble controls at max."]![]() |
[caption id="attachment_597" align="alignleft" width="300" caption="BA Duo-i plus with bass and treble controls at minimum."]![]() |
[caption id="attachment_599" align="alignright" width="300" caption="Duo-i plus up agains a wall with additional gain in lows resulting."]![]() ![]() |
[caption id="attachment_602" align="alignleft" width="300" caption="The Skullcandy Pipe ruuns on 4 AA batteries."]![]() |
[caption id="attachment_603" align="alignright" width="300" caption="The Pipe response is flawed, but what did you expect?"]![]() |
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