If the designer chooses to lower the speaker's impedance from 8 to 4 ohms the speaker's sensitivity would increase. So far so good, but as we continued the discussion Jones brought up another factor: speaker impedance (a.k.a. Jones again, "We constantly juggle, and different designers make different compromises." That last option might please die-hard audiophiles, but the mainstream market wants smaller, not larger speakers. Or design for high sensitivity and deep bass, but then he would need to increase the size of the cabinet. Or he could stay with the small cabinet and design for high sensitivity, but then lose some deep bass.
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Jones explained "You're free to choose any two of those parameters however you want, the third will be given to you." For example Jones could design a small speaker that's capable of producing fairly deep bass - those are the two desirable pluses - but that speaker would be highly insensitive so it would need a very powerful amplifier to sound its best. As Jones put it, "Absolutely you're juggling, within the laws of physics, and you can't actually overcome that!" The choices – big or small cabinet, how much bass, and how much power the speaker needs to play loud, which techies call sensitivity – those are the three parameters he juggles with every new project. Jones started the conversation discussing three design parameters: cabinet size, the desired low frequency (bass) extension, and sensitivity.
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