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Spectral Contamination:  (non-linear distortion)

Typically musical notes are not pure tones.   Instead, multiple sine waves blend together to form a note.   It is not the job of the loudspeaker to insert additional tones into our music however.  These additional components to the spectrum contaminate the music with harmonic distortion.    Not all loudspeaker drivers are created equal but all are created imperfect.   The degree to which a loudspeaker controls harmonic distortion will have a great impact on its sound quality.  

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Stored Energy:  (linear distortion)

How badly a loudspeaker smears sound across time also will have a great impact on the quality of the reproduction.  In fact, often times this characteristic of a driver may play a greater roll in overall sound quality than its non-linear performance.

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"Thiele / Small"  Parameters:

I'll be making some Thiele/Small parameter measurements and posting them but not many.   These really don't tell you anything about a driver's performance.   Of course you  need to know these if you plan to make the mistake of mounting the driver in a box:-) (or even if not for that matter) but this sort of information is generally easily obtainable.   Normally I don't bother measuring T/S until I know I'm going to use the driver for a particular application.

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Data:

Woofers            Midranges            Tweeters            Other

Dayton Reference Series  8 and 10" Drivers

Dayton Reference Series 5, 6, and 7" Drivers